POP动画引擎是facebook提供的一个开源框架, 可以实现很多的动画效果, 这里就不一一介绍啦, 有兴趣的童鞋请移步:
https://github.com/facebook/pop
下面简单的讲一下POP动画引擎中Layer与CALayer的区别:
这里, 代码做的都是同一个效果: 执行位移动画3秒, 然后在1秒后移除所有动画
使用POP效果图:
使用CALayer效果图:
可以看到, POP执行的动画当动画被移除之后, 被执行对象保留了被停止时的状态
而CALayer执行的动画当动画被移除之后, 跳到了另外一个状态, 这是因为CALayer添加的
CABasicAnimation动画会另外生成一个图层来执行动画, 而CALayer本身早已经是动画结束后状态, 当动画结束后就会显示出来,
所以就会出现, 当动画执行到一半被移除的时候, 就会出现跳动的现象..
这也就是这两者之间的一点区别..
以下是代码:
#import "ViewController.h" #import <POP.h> @interface ViewController () // 测试CALayer @property (nonatomic, strong) CALayer *normalLayer; // 用于测试POP的Layer @property (nonatomic, strong) CALayer *popLayer; @end @implementation ViewController - (void)viewDidLoad { [super viewDidLoad]; } - (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event { [self setupNormalLayer]; // 一秒后移除所有动画 [self performSelector:@selector(stopAnimation) withObject:nil afterDelay:1.f]; } - (void)setupPopLayer { // 初始化 self.popLayer = [CALayer layer]; self.popLayer.frame = CGRectMake(0, 0, 100, 100); self.popLayer.backgroundColor = [UIColor redColor].CGColor; [self.view.layer addSublayer:self.popLayer]; // 添加POP动画 POPBasicAnimation *basicAnimation = [POPBasicAnimation animationWithPropertyNamed:@"position"]; basicAnimation.toValue = [NSValue valueWithCGPoint:CGPointMake(self.popLayer.position.x, 300)]; basicAnimation.duration = 3.f; [self.popLayer pop_addAnimation:basicAnimation forKey:nil]; } - (void)setupNormalLayer { // 初始化 self.normalLayer = [CALayer layer]; self.normalLayer.frame = CGRectMake(0, 0, 100, 100); self.normalLayer.backgroundColor = [UIColor redColor].CGColor; [self.view.layer addSublayer:self.normalLayer]; // 添加动画 CABasicAnimation *basicAnimation = [CABasicAnimation animationWithKeyPath:@"position"]; basicAnimation.fromValue = [NSValue valueWithCGPoint:CGPointMake(self.normalLayer.position.x, self.normalLayer.position.y)]; basicAnimation.toValue = [NSValue valueWithCGPoint:CGPointMake(self.normalLayer.position.x, 300)]; basicAnimation.duration = 3.f; [self.normalLayer addAnimation:basicAnimation forKey:nil]; self.normalLayer.position = CGPointMake(self.normalLayer.position.x, 300); } - (void)stopAnimation { [self.normalLayer removeAllAnimations]; // [self.popLayer pop_removeAllAnimations]; } @end
时间: 2024-10-27 12:14:00