Additive屬性動畫

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參考

http://ronnqvi.st/multiple-animations/

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效果

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源碼

https://github.com/YouXianMing/Animations

// // AdditiveAnimationController.m // Animations // // Created by YouXianMing on 16/1/21. // Copyright ? 2016年 YouXianMing. All rights reserved. // #import "AdditiveAnimationController.h" #import "UIView+SetRect.h"@interface AdditiveAnimationController ()@property (nonatomic, strong) CALayer *layer;@end@implementation AdditiveAnimationController- (void)setup {[super setup];// http://ronnqvi.st/multiple-animations/ self.layer = [CALayer layer];self.layer.frame = CGRectMake(0, 0, 30, 30);self.layer.backgroundColor = [UIColor redColor].CGColor;self.layer.cornerRadius = 15.f;self.layer.position = self.contentView.middlePoint;[self.contentView.layer addSublayer:self.layer];UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapEvent:)];[self.contentView addGestureRecognizer:tap]; }- (void)tapEvent:(UITapGestureRecognizer *)tapGesture {CGPoint touchPoint = [tapGesture locationInView:tapGesture.view];CGPoint differencePoint = CGPointMake(self.layer.position.x - touchPoint.x,self.layer.position.y - touchPoint.y);CALayer *presentationLayer = self.layer.presentationLayer;NSLog(@"%@", presentationLayer);CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"position"];animation.duration = 1.f;animation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];animation.additive = true;animation.fromValue = [NSValue valueWithCGPoint:differencePoint];animation.toValue = [NSValue valueWithCGPoint:CGPointZero];[CATransaction begin];[CATransaction setDisableActions:YES];self.layer.position = touchPoint;[CATransaction commit];[self.layer addAnimation:animation forKey:nil]; }@end

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細節

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總結

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