45 lines
1.9 KiB
Objective-C
Executable File
45 lines
1.9 KiB
Objective-C
Executable File
//
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// DGActivityIndicatorBallPulseAnimation.m
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// DGActivityIndicatorExample
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//
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// Created by Nguyen Vinh on 7/19/15.
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// Copyright (c) 2015 Danil Gontovnik. All rights reserved.
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//
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#import "DGActivityIndicatorBallPulseAnimation.h"
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@implementation DGActivityIndicatorBallPulseAnimation
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- (void)setupAnimationInLayer:(CALayer *)layer withSize:(CGSize)size tintColor:(UIColor *)tintColor {
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CGFloat circlePadding = 5.0f;
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CGFloat circleSize = (size.width - 2 * circlePadding) / 3;
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CGFloat x = (layer.bounds.size.width - size.width) / 2;
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CGFloat y = (layer.bounds.size.height - circleSize) / 2;
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CGFloat duration = 0.75f;
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NSArray *timeBegins = @[@0.12f, @0.24f, @0.36f];
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CAMediaTimingFunction *timingFunction = [CAMediaTimingFunction functionWithControlPoints:0.2f :0.68f :0.18f :1.08f];
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CAKeyframeAnimation *animation = [self createKeyframeAnimationWithKeyPath:@"transform"];
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animation.values = @[[NSValue valueWithCATransform3D:CATransform3DMakeScale(1.0f, 1.0f, 1.0f)],
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[NSValue valueWithCATransform3D:CATransform3DMakeScale(0.3f, 0.3f, 1.0f)],
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[NSValue valueWithCATransform3D:CATransform3DMakeScale(1.0f, 1.0f, 1.0f)]];
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animation.keyTimes = @[@0.0f, @0.3f, @1.0f];
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animation.timingFunctions = @[timingFunction, timingFunction];
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animation.duration = duration;
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animation.repeatCount = HUGE_VALF;
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for (int i = 0; i < 3; i++) {
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CALayer *circle = [CALayer layer];
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circle.frame = CGRectMake(x + i * circleSize + i * circlePadding, y, circleSize, circleSize);
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circle.backgroundColor = tintColor.CGColor;
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circle.cornerRadius = circle.bounds.size.width / 2;
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animation.beginTime = [timeBegins[i] floatValue];
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[circle addAnimation:animation forKey:@"animation"];
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[layer addSublayer:circle];
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}
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}
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@end
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