68 lines
3.3 KiB
Objective-C
Executable File
68 lines
3.3 KiB
Objective-C
Executable File
//
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// DGActivityIndicatorRotatingTrigonsAnimation.m
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// DGActivityIndicatorExample
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//
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// Created by tripleCC on 15/6/26.
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// Copyright (c) 2015年 Danil Gontovnik. All rights reserved.
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//
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#import "DGActivityIndicatorRotatingTrigonAnimation.h"
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@implementation DGActivityIndicatorRotatingTrigonAnimation
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#pragma mark -
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#pragma mark DGActivityIndicatorAnimation Protocol
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- (void)setupAnimationInLayer:(CALayer *)layer withSize:(CGSize)size tintColor:(UIColor *)tintColor {
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NSTimeInterval beginTime = CACurrentMediaTime();
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CGFloat circleSize = size.width / 4.0f;;
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CGFloat oX = (layer.bounds.size.width - size.width) / 2.0f;
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CGFloat oY = (layer.bounds.size.height - size.width) / 2.0f;
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UIBezierPath *path = [UIBezierPath bezierPathWithOvalInRect:CGRectMake(0, 0, circleSize, circleSize)];
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CGPoint pointA = CGPointMake(oX + size.width / 2.0f, oY + circleSize / 2.0f);
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CGPoint pointB = CGPointMake(oX + circleSize / 2.0f, oY + circleSize / 2.0f + sqrtf(powf((size.width - circleSize), 2) - powf((size.width / 2.0f - circleSize / 2.0f), 2)));
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CGPoint pointC = CGPointMake(oX + size.width - circleSize / 2.0f, pointB.y);
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for (int i = 0; i < 3; i++) {
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CAShapeLayer *circle = [CAShapeLayer layer];
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circle.path = path.CGPath;
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circle.fillColor = [UIColor clearColor].CGColor;
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circle.strokeColor = tintColor.CGColor;
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circle.bounds = CGRectMake(0, 0, circleSize, circleSize);
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circle.position = pointA;
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circle.anchorPoint = CGPointMake(0.5f, 0.5f);
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circle.transform = CATransform3DMakeScale(0.0f, 0.0f, 0.0f);
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circle.shouldRasterize = YES;
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circle.rasterizationScale = [[UIScreen mainScreen] scale];
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CAKeyframeAnimation *transformAnimation = [self createKeyframeAnimationWithKeyPath:@"transform"];
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transformAnimation.repeatCount = HUGE_VALF;
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transformAnimation.duration = 2.0f;
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transformAnimation.beginTime = beginTime - (i * transformAnimation.duration / 3.0f);;
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transformAnimation.keyTimes = @[@(0.0f), @(1.0f / 3.0f), @(2.0f / 3.0f), @(1.0)];
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transformAnimation.timingFunctions = @[[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut],
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[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut],
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[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut],
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[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut]];
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CATransform3D t1 = CATransform3DMakeTranslation(pointB.x - pointA.x, pointB.y - pointA.y, 0.0f);
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CATransform3D t2 = CATransform3DMakeTranslation(pointC.x - pointA.x, pointC.y - pointA.y, 0.0f);
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CATransform3D t3 = CATransform3DMakeTranslation(0.0f, 0.0f, 0.0f);
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transformAnimation.values = @[[NSValue valueWithCATransform3D:CATransform3DIdentity],
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[NSValue valueWithCATransform3D:t1],
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[NSValue valueWithCATransform3D:t2],
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[NSValue valueWithCATransform3D:t3]];
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[layer addSublayer:circle];
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[circle addAnimation:transformAnimation forKey:@"animation"];
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}
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}
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@end
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