Additive属性动画

Additive属性动画

参考

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

效果

源码

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(, , , );

    self.layer.backgroundColor = [UIColor redColor].CGColor;

    self.layer.cornerRadius    = .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          = .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

细节