598 lines
25 KiB
Objective-C
598 lines
25 KiB
Objective-C
//
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// JXPagerListContainerView.m
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// JXCategoryView
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//
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// Created by jiaxin on 2018/9/12.
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// Copyright © 2018年 jiaxin. All rights reserved.
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//
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#import "JXPagerListContainerView.h"
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#import <objc/runtime.h>
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@interface JXPagerListContainerScrollView: UIScrollView <UIGestureRecognizerDelegate>
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@property (nonatomic, assign, getter=isCategoryNestPagingEnabled) BOOL categoryNestPagingEnabled;
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@end
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@implementation JXPagerListContainerScrollView
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- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer {
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if (self.isCategoryNestPagingEnabled) {
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if ([gestureRecognizer isMemberOfClass:NSClassFromString(@"UIScrollViewPanGestureRecognizer")]) {
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CGFloat velocityX = [(UIPanGestureRecognizer *)gestureRecognizer velocityInView:gestureRecognizer.view].x;
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//x大于0就是往右滑
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if (velocityX > 0) {
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if (self.contentOffset.x == 0) {
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return NO;
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}
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}else if (velocityX < 0) {
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//x小于0就是往左滑
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if (self.contentOffset.x + self.bounds.size.width == self.contentSize.width) {
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return NO;
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}
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}
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}
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}
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return YES;
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}
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@end
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@interface JXPagerListContainerCollectionView: UICollectionView <UIGestureRecognizerDelegate>
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@property (nonatomic, assign, getter=isCategoryNestPagingEnabled) BOOL categoryNestPagingEnabled;
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@end
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@implementation JXPagerListContainerCollectionView
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- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer {
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if (self.isCategoryNestPagingEnabled) {
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if ([gestureRecognizer isMemberOfClass:NSClassFromString(@"UIScrollViewPanGestureRecognizer")]) {
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CGFloat velocityX = [(UIPanGestureRecognizer *)gestureRecognizer velocityInView:gestureRecognizer.view].x;
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//x大于0就是往右滑
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if (velocityX > 0) {
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if (self.contentOffset.x == 0) {
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return NO;
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}
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}else if (velocityX < 0) {
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//x小于0就是往左滑
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if (self.contentOffset.x + self.bounds.size.width == self.contentSize.width) {
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return NO;
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}
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}
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}
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}
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return YES;
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}
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@end
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@interface JXPagerListContainerViewController : UIViewController
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@property (copy) void(^viewWillAppearBlock)(void);
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@property (copy) void(^viewDidAppearBlock)(void);
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@property (copy) void(^viewWillDisappearBlock)(void);
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@property (copy) void(^viewDidDisappearBlock)(void);
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@end
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@implementation JXPagerListContainerViewController
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- (void)dealloc
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{
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self.viewWillAppearBlock = nil;
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self.viewDidAppearBlock = nil;
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self.viewWillDisappearBlock = nil;
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self.viewDidDisappearBlock = nil;
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}
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- (void)viewWillAppear:(BOOL)animated {
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[super viewWillAppear:animated];
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self.viewWillAppearBlock();
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}
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- (void)viewDidAppear:(BOOL)animated {
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[super viewDidAppear:animated];
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self.viewDidAppearBlock();
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}
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- (void)viewWillDisappear:(BOOL)animated {
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[super viewWillDisappear:animated];
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self.viewWillDisappearBlock();
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}
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- (void)viewDidDisappear:(BOOL)animated {
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[super viewDidDisappear:animated];
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self.viewDidDisappearBlock();
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}
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- (BOOL)shouldAutomaticallyForwardAppearanceMethods { return NO; }
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@end
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@interface JXPagerListContainerView () <UIScrollViewDelegate, UICollectionViewDelegate, UICollectionViewDataSource>
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@property (nonatomic, weak) id<JXPagerListContainerViewDelegate> delegate;
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@property (nonatomic, strong) UIScrollView *scrollView;
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@property (nonatomic, assign) NSInteger currentIndex;
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@property (nonatomic, strong) NSMutableDictionary <NSNumber *, id<JXPagerViewListViewDelegate>> *validListDict;
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@property (nonatomic, assign) NSInteger willAppearIndex;
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@property (nonatomic, assign) NSInteger willDisappearIndex;
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@property (nonatomic, strong) UICollectionView *collectionView;
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@property (nonatomic, strong) JXPagerListContainerViewController *containerVC;
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@end
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@implementation JXPagerListContainerView
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- (instancetype)initWithType:(JXPagerListContainerType)type delegate:(id<JXPagerListContainerViewDelegate>)delegate{
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self = [super initWithFrame:CGRectZero];
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if (self) {
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_containerType = type;
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_delegate = delegate;
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_validListDict = [NSMutableDictionary dictionary];
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_willAppearIndex = -1;
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_willDisappearIndex = -1;
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_initListPercent = 0.01;
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[self initializeViews];
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}
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return self;
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}
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- (void)initializeViews {
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_listCellBackgroundColor = [UIColor whiteColor];
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_containerVC = [[JXPagerListContainerViewController alloc] init];
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self.containerVC.view.backgroundColor = [UIColor clearColor];
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[self addSubview:self.containerVC.view];
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__weak typeof(self) weakSelf = self;
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self.containerVC.viewWillAppearBlock = ^{
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[weakSelf listWillAppear:weakSelf.currentIndex];
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};
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self.containerVC.viewDidAppearBlock = ^{
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[weakSelf listDidAppear:weakSelf.currentIndex];
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};
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self.containerVC.viewWillDisappearBlock = ^{
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[weakSelf listWillDisappear:weakSelf.currentIndex];
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};
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self.containerVC.viewDidDisappearBlock = ^{
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[weakSelf listDidDisappear:weakSelf.currentIndex];
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};
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if (self.containerType == JXPagerListContainerType_ScrollView) {
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if (self.delegate &&
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[self.delegate respondsToSelector:@selector(scrollViewClassInlistContainerView:)] &&
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[[self.delegate scrollViewClassInlistContainerView:self] isKindOfClass:object_getClass([UIScrollView class])]) {
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_scrollView = (UIScrollView *)[[[self.delegate scrollViewClassInlistContainerView:self] alloc] init];
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}else {
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_scrollView = [[JXPagerListContainerScrollView alloc] init];
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}
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self.scrollView.backgroundColor = [UIColor clearColor];
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self.scrollView.delegate = self;
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self.scrollView.pagingEnabled = YES;
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self.scrollView.showsHorizontalScrollIndicator = NO;
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self.scrollView.showsVerticalScrollIndicator = NO;
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self.scrollView.scrollsToTop = NO;
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self.scrollView.bounces = NO;
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if (@available(iOS 11.0, *)) {
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self.scrollView.contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentNever;
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}
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[self.containerVC.view addSubview:self.scrollView];
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}else {
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UICollectionViewFlowLayout *layout = [[UICollectionViewFlowLayout alloc] init];
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layout.scrollDirection = UICollectionViewScrollDirectionHorizontal;
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layout.minimumLineSpacing = 0;
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layout.minimumInteritemSpacing = 0;
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if (self.delegate &&
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[self.delegate respondsToSelector:@selector(scrollViewClassInlistContainerView:)] &&
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[[self.delegate scrollViewClassInlistContainerView:self] isKindOfClass:object_getClass([UICollectionView class])]) {
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_collectionView = (UICollectionView *)[[[self.delegate scrollViewClassInlistContainerView:self] alloc] initWithFrame:CGRectZero collectionViewLayout:layout];
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}else {
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_collectionView = [[JXPagerListContainerCollectionView alloc] initWithFrame:CGRectZero collectionViewLayout:layout];
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}
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self.collectionView.backgroundColor = [UIColor clearColor];
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self.collectionView.pagingEnabled = YES;
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self.collectionView.showsHorizontalScrollIndicator = NO;
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self.collectionView.showsVerticalScrollIndicator = NO;
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self.collectionView.scrollsToTop = NO;
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self.collectionView.bounces = NO;
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self.collectionView.dataSource = self;
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self.collectionView.delegate = self;
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[self.collectionView registerClass:[UICollectionViewCell class] forCellWithReuseIdentifier:@"cell"];
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if (@available(iOS 10.0, *)) {
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self.collectionView.prefetchingEnabled = NO;
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}
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if (@available(iOS 11.0, *)) {
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self.collectionView.contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentNever;
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}
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[self.containerVC.view addSubview:self.collectionView];
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//让外部统一访问scrollView
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_scrollView = _collectionView;
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}
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}
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- (void)willMoveToSuperview:(UIView *)newSuperview {
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[super willMoveToSuperview:newSuperview];
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UIResponder *next = newSuperview;
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while (next != nil) {
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if ([next isKindOfClass:[UIViewController class]]) {
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[((UIViewController *)next) addChildViewController:self.containerVC];
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break;
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}
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next = next.nextResponder;
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}
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}
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- (void)layoutSubviews {
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[super layoutSubviews];
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self.containerVC.view.frame = self.bounds;
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if (self.containerType == JXPagerListContainerType_ScrollView) {
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if (CGRectEqualToRect(self.scrollView.frame, CGRectZero) || !CGSizeEqualToSize(self.scrollView.bounds.size, self.bounds.size)) {
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self.scrollView.frame = self.bounds;
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self.scrollView.contentSize = CGSizeMake(self.scrollView.bounds.size.width*[self.delegate numberOfListsInlistContainerView:self], self.scrollView.bounds.size.height);
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[_validListDict enumerateKeysAndObjectsUsingBlock:^(NSNumber * _Nonnull index, id<JXPagerViewListViewDelegate> _Nonnull list, BOOL * _Nonnull stop) {
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[list listView].frame = CGRectMake(index.intValue*self.scrollView.bounds.size.width, 0, self.scrollView.bounds.size.width, self.scrollView.bounds.size.height);
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}];
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self.scrollView.contentOffset = CGPointMake(self.currentIndex*self.scrollView.bounds.size.width, 0);
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}else {
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self.scrollView.frame = self.bounds;
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self.scrollView.contentSize = CGSizeMake(self.scrollView.bounds.size.width*[self.delegate numberOfListsInlistContainerView:self], self.scrollView.bounds.size.height);
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}
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}else {
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if (CGRectEqualToRect(self.collectionView.frame, CGRectZero) || !CGSizeEqualToSize(self.collectionView.bounds.size, self.bounds.size)) {
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self.collectionView.frame = self.bounds;
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[self.collectionView.collectionViewLayout invalidateLayout];
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[self.collectionView reloadData];
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[self.collectionView setContentOffset:CGPointMake(self.collectionView.bounds.size.width*self.currentIndex, 0) animated:NO];
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}else {
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self.collectionView.frame = self.bounds;
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}
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}
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}
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- (void)setinitListPercent:(CGFloat)initListPercent {
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_initListPercent = initListPercent;
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if (initListPercent <= 0 || initListPercent >= 1) {
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NSAssert(NO, @"initListPercent值范围为开区间(0,1)，即不包括0和1");
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}
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}
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- (void)setCategoryNestPagingEnabled:(BOOL)categoryNestPagingEnabled {
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_categoryNestPagingEnabled = categoryNestPagingEnabled;
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if ([self.scrollView isKindOfClass:[JXPagerListContainerScrollView class]]) {
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((JXPagerListContainerScrollView *)self.scrollView).categoryNestPagingEnabled = categoryNestPagingEnabled;
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}else if ([self.scrollView isKindOfClass:[JXPagerListContainerCollectionView class]]) {
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((JXPagerListContainerCollectionView *)self.scrollView).categoryNestPagingEnabled = categoryNestPagingEnabled;
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}
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}
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#pragma mark - UICollectionViewDelegate, UICollectionViewDataSource
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- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {
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return [self.delegate numberOfListsInlistContainerView:self];
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}
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- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
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UICollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"cell" forIndexPath:indexPath];
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cell.contentView.backgroundColor = self.listCellBackgroundColor;
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for (UIView *subview in cell.contentView.subviews) {
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[subview removeFromSuperview];
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}
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id<JXPagerViewListViewDelegate> list = _validListDict[@(indexPath.item)];
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if (list != nil) {
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//fixme:如果list是UIViewController，如果这里的frame修改是`[list listView].frame = cell.bounds;`。那么就必须给list vc添加如下代码:
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//- (void)loadView {
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// self.view = [[UIView alloc] init];
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//}
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//所以，总感觉是把UIViewController当做普通view使用，导致了系统内部的bug。所以，缓兵之计就是用下面的方法，暂时解决问题。
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if ([list isKindOfClass:[UIViewController class]]) {
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[list listView].frame = cell.contentView.bounds;
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} else {
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[list listView].frame = cell.bounds;
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}
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[cell.contentView addSubview:[list listView]];
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}
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return cell;
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}
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- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath {
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return self.bounds.size;
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}
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#pragma mark - UIScrollViewDelegate
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- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
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if (self.delegate && [self.delegate respondsToSelector:@selector(listContainerViewDidScroll:)]) {
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[self.delegate listContainerViewDidScroll:scrollView];
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}
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if (!scrollView.isDragging && !scrollView.isTracking && !scrollView.isDecelerating) {
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return;
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}
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CGFloat ratio = scrollView.contentOffset.x/scrollView.bounds.size.width;
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NSInteger maxCount = round(scrollView.contentSize.width/scrollView.bounds.size.width);
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NSInteger leftIndex = floorf(ratio);
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leftIndex = MAX(0, MIN(maxCount - 1, leftIndex));
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NSInteger rightIndex = leftIndex + 1;
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if (ratio < 0 || rightIndex >= maxCount) {
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[self listDidAppearOrDisappear:scrollView];
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return;
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}
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CGFloat remainderRatio = ratio - leftIndex;
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if (rightIndex == self.currentIndex) {
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//当前选中的在右边，用户正在从右边往左边滑动
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if (self.validListDict[@(leftIndex)] == nil && remainderRatio < (1 - self.initListPercent)) {
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[self initListIfNeededAtIndex:leftIndex];
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}else if (self.validListDict[@(leftIndex)] != nil) {
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if (self.willAppearIndex == -1) {
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self.willAppearIndex = leftIndex;
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[self listWillAppear:self.willAppearIndex];
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}
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}
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if (self.willDisappearIndex == -1) {
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self.willDisappearIndex = rightIndex;
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[self listWillDisappear:self.willDisappearIndex];
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}
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}else {
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//当前选中的在左边，用户正在从左边往右边滑动
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if (self.validListDict[@(rightIndex)] == nil && remainderRatio > self.initListPercent) {
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[self initListIfNeededAtIndex:rightIndex];
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}else if (self.validListDict[@(rightIndex)] != nil) {
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if (self.willAppearIndex == -1) {
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self.willAppearIndex = rightIndex;
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[self listWillAppear:self.willAppearIndex];
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}
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}
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if (self.willDisappearIndex == -1) {
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self.willDisappearIndex = leftIndex;
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[self listWillDisappear:self.willDisappearIndex];
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}
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}
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[self listDidAppearOrDisappear:scrollView];
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}
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- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView {
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if (self.willDisappearIndex != -1) {
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[self listWillAppear:self.willDisappearIndex];
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[self listWillDisappear:self.willAppearIndex];
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[self listDidAppear:self.willDisappearIndex];
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[self listDidDisappear:self.willAppearIndex];
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self.willDisappearIndex = -1;
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self.willAppearIndex = -1;
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}
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if (self.delegate && [self.delegate respondsToSelector:@selector(listContainerViewWDidEndScroll:)]) {
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[self.delegate listContainerViewWDidEndScroll:self];
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}
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}
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- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView {
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if (self.delegate && [self.delegate respondsToSelector:@selector(listContainerViewWillBeginDragging:)]) {
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[self.delegate listContainerViewWillBeginDragging:self];
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}
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}
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- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate {
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if (!decelerate) {
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if (self.delegate && [self.delegate respondsToSelector:@selector(listContainerViewWDidEndScroll:)]) {
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[self.delegate listContainerViewWDidEndScroll:self];
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}
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}
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}
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- (void)scrollViewDidEndScrollingAnimation:(UIScrollView *)scrollView {
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if (self.delegate && [self.delegate respondsToSelector:@selector(listContainerViewWDidEndScroll:)]) {
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[self.delegate listContainerViewWDidEndScroll:self];
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}
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}
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#pragma mark - JXCategoryViewListContainer
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- (UIScrollView *)contentScrollView {
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return self.scrollView;
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}
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- (void)setDefaultSelectedIndex:(NSInteger)index {
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self.currentIndex = index;
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}
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- (void)scrollingFromLeftIndex:(NSInteger)leftIndex toRightIndex:(NSInteger)rightIndex ratio:(CGFloat)ratio selectedIndex:(NSInteger)selectedIndex {
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}
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- (void)didClickSelectedItemAtIndex:(NSInteger)index {
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if (![self checkIndexValid:index]) {
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return;
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}
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self.willAppearIndex = -1;
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self.willDisappearIndex = -1;
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if (self.currentIndex != index) {
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[self listWillDisappear:self.currentIndex];
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[self listDidDisappear:self.currentIndex];
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[self listWillAppear:index];
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[self listDidAppear:index];
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}
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}
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- (void)reloadData {
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for (id<JXPagerViewListViewDelegate> list in _validListDict.allValues) {
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[[list listView] removeFromSuperview];
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if ([list isKindOfClass:[UIViewController class]]) {
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[(UIViewController *)list removeFromParentViewController];
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}
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}
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[_validListDict removeAllObjects];
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if (self.containerType == JXPagerListContainerType_ScrollView) {
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self.scrollView.contentSize = CGSizeMake(self.scrollView.bounds.size.width*[self.delegate numberOfListsInlistContainerView:self], self.scrollView.bounds.size.height);
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}else {
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[self.collectionView reloadData];
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}
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[self listWillAppear:self.currentIndex];
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[self listDidAppear:self.currentIndex];
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}
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#pragma mark - Private
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- (void)initListIfNeededAtIndex:(NSInteger)index {
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if (self.delegate && [self.delegate respondsToSelector:@selector(listContainerView:canInitListAtIndex:)]) {
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BOOL canInitList = [self.delegate listContainerView:self canInitListAtIndex:index];
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if (!canInitList) {
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return;
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}
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}
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id<JXPagerViewListViewDelegate> list = _validListDict[@(index)];
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if (list != nil) {
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//列表已经创建好了
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return;
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}
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list = [self.delegate listContainerView:self initListForIndex:index];
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if ([list isKindOfClass:[UIViewController class]]) {
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[self.containerVC addChildViewController:(UIViewController *)list];
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}
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_validListDict[@(index)] = list;
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switch (self.containerType) {
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||
case JXPagerListContainerType_ScrollView: {
|
||
[list listView].frame = CGRectMake(index*self.scrollView.bounds.size.width, 0, self.scrollView.bounds.size.width, self.scrollView.bounds.size.height);
|
||
[self.scrollView addSubview:[list listView]];
|
||
break;
|
||
}
|
||
case JXPagerListContainerType_CollectionView: {
|
||
UICollectionViewCell *cell = [self.collectionView cellForItemAtIndexPath:[NSIndexPath indexPathForItem:index inSection:0]];
|
||
if (cell != nil) {
|
||
for (UIView *subview in cell.contentView.subviews) {
|
||
[subview removeFromSuperview];
|
||
}
|
||
[list listView].frame = cell.contentView.bounds;
|
||
[cell.contentView addSubview:[list listView]];
|
||
}
|
||
break;
|
||
}
|
||
|
||
}
|
||
}
|
||
|
||
- (void)listWillAppear:(NSInteger)index {
|
||
if (![self checkIndexValid:index]) {
|
||
return;
|
||
}
|
||
id<JXPagerViewListViewDelegate> list = _validListDict[@(index)];
|
||
if (list != nil) {
|
||
if (list && [list respondsToSelector:@selector(listWillAppear)]) {
|
||
[list listWillAppear];
|
||
}
|
||
if ([list isKindOfClass:[UIViewController class]]) {
|
||
UIViewController *listVC = (UIViewController *)list;
|
||
[listVC beginAppearanceTransition:YES animated:NO];
|
||
}
|
||
}else {
|
||
//当前列表未被创建（页面初始化或通过点击触发的listWillAppear）
|
||
BOOL canInitList = YES;
|
||
if (self.delegate && [self.delegate respondsToSelector:@selector(listContainerView:canInitListAtIndex:)]) {
|
||
canInitList = [self.delegate listContainerView:self canInitListAtIndex:index];
|
||
}
|
||
if (canInitList) {
|
||
id<JXPagerViewListViewDelegate> list = _validListDict[@(index)];
|
||
if (list == nil) {
|
||
list = [self.delegate listContainerView:self initListForIndex:index];
|
||
if ([list isKindOfClass:[UIViewController class]]) {
|
||
[self.containerVC addChildViewController:(UIViewController *)list];
|
||
}
|
||
_validListDict[@(index)] = list;
|
||
}
|
||
if (self.containerType == JXPagerListContainerType_ScrollView) {
|
||
if ([list listView].superview == nil) {
|
||
[list listView].frame = CGRectMake(index*self.scrollView.bounds.size.width, 0, self.scrollView.bounds.size.width, self.scrollView.bounds.size.height);
|
||
[self.scrollView addSubview:[list listView]];
|
||
|
||
if (list && [list respondsToSelector:@selector(listWillAppear)]) {
|
||
[list listWillAppear];
|
||
}
|
||
if ([list isKindOfClass:[UIViewController class]]) {
|
||
UIViewController *listVC = (UIViewController *)list;
|
||
[listVC beginAppearanceTransition:YES animated:NO];
|
||
}
|
||
}
|
||
}else {
|
||
UICollectionViewCell *cell = [self.collectionView cellForItemAtIndexPath:[NSIndexPath indexPathForItem:index inSection:0]];
|
||
for (UIView *subview in cell.contentView.subviews) {
|
||
[subview removeFromSuperview];
|
||
}
|
||
[list listView].frame = cell.contentView.bounds;
|
||
[cell.contentView addSubview:[list listView]];
|
||
|
||
if (list && [list respondsToSelector:@selector(listWillAppear)]) {
|
||
[list listWillAppear];
|
||
}
|
||
if ([list isKindOfClass:[UIViewController class]]) {
|
||
UIViewController *listVC = (UIViewController *)list;
|
||
[listVC beginAppearanceTransition:YES animated:NO];
|
||
}
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
- (void)listDidAppear:(NSInteger)index {
|
||
if (![self checkIndexValid:index]) {
|
||
return;
|
||
}
|
||
self.currentIndex = index;
|
||
id<JXPagerViewListViewDelegate> list = _validListDict[@(index)];
|
||
if (list && [list respondsToSelector:@selector(listDidAppear)]) {
|
||
[list listDidAppear];
|
||
}
|
||
if ([list isKindOfClass:[UIViewController class]]) {
|
||
UIViewController *listVC = (UIViewController *)list;
|
||
[listVC endAppearanceTransition];
|
||
}
|
||
if (self.delegate && [self.delegate respondsToSelector:@selector(listContainerView:listDidAppearAtIndex:)]) {
|
||
[self.delegate listContainerView:self listDidAppearAtIndex:index];
|
||
}
|
||
}
|
||
|
||
- (void)listWillDisappear:(NSInteger)index {
|
||
if (![self checkIndexValid:index]) {
|
||
return;
|
||
}
|
||
id<JXPagerViewListViewDelegate> list = _validListDict[@(index)];
|
||
if (list && [list respondsToSelector:@selector(listWillDisappear)]) {
|
||
[list listWillDisappear];
|
||
}
|
||
if ([list isKindOfClass:[UIViewController class]]) {
|
||
UIViewController *listVC = (UIViewController *)list;
|
||
[listVC beginAppearanceTransition:NO animated:NO];
|
||
}
|
||
}
|
||
|
||
- (void)listDidDisappear:(NSInteger)index {
|
||
if (![self checkIndexValid:index]) {
|
||
return;
|
||
}
|
||
id<JXPagerViewListViewDelegate> list = _validListDict[@(index)];
|
||
if (list && [list respondsToSelector:@selector(listDidDisappear)]) {
|
||
[list listDidDisappear];
|
||
}
|
||
if ([list isKindOfClass:[UIViewController class]]) {
|
||
UIViewController *listVC = (UIViewController *)list;
|
||
[listVC endAppearanceTransition];
|
||
}
|
||
}
|
||
|
||
- (BOOL)checkIndexValid:(NSInteger)index {
|
||
NSUInteger count = [self.delegate numberOfListsInlistContainerView:self];
|
||
if (count <= 0 || index >= count) {
|
||
return NO;
|
||
}
|
||
return YES;
|
||
}
|
||
|
||
- (void)listDidAppearOrDisappear:(UIScrollView *)scrollView {
|
||
CGFloat currentIndexPercent = scrollView.contentOffset.x/scrollView.bounds.size.width;
|
||
if (self.willAppearIndex != -1 || self.willDisappearIndex != -1) {
|
||
NSInteger disappearIndex = self.willDisappearIndex;
|
||
NSInteger appearIndex = self.willAppearIndex;
|
||
if (self.willAppearIndex > self.willDisappearIndex) {
|
||
//将要出现的列表在右边
|
||
if (currentIndexPercent >= self.willAppearIndex) {
|
||
self.willDisappearIndex = -1;
|
||
self.willAppearIndex = -1;
|
||
[self listDidDisappear:disappearIndex];
|
||
[self listDidAppear:appearIndex];
|
||
}
|
||
}else {
|
||
//将要出现的列表在左边
|
||
if (currentIndexPercent <= self.willAppearIndex) {
|
||
self.willDisappearIndex = -1;
|
||
self.willAppearIndex = -1;
|
||
[self listDidDisappear:disappearIndex];
|
||
[self listDidAppear:appearIndex];
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
@end
|
||
|
||
|