//
//  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