利用弹跳动画写一个视图拉伸
1.创建一个视图,并为视图添加拖拽手势
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| self.testView = [[UIView alloc] initWithFrame:CGRectMake(0, 100, 100, 100)];
self.testView.backgroundColor = [UIColor redColor];
[self.view addSubview:self.testView];
UIPanGestureRecognizer *panGestureRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panHandler:)];
[self.view addGestureRecognizer:panGestureRecognizer];
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2.响应手势做动画变换
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| POPSpringAnimation *positionAnimation = [POPSpringAnimation animationWithPropertyNamed:kPOPLayerPosition];
positionAnimation.velocity = [NSValue valueWithCGPoint:velocity];／／速度
positionAnimation.dynamicsTension = 5;／／延伸
positionAnimation.dynamicsFriction = 15.0f;／／摩擦
positionAnimation.springBounciness = 20.0f;／／弹跳
[self.testView.layer pop_addAnimation:positionAnimation forKey:@"positionAnimation"];//位置变换
POPSpringAnimation *sizeAnimation = [POPSpringAnimation animationWithPropertyNamed:kPOPLayerSize];
sizeAnimation.velocity = [NSValue valueWithCGPoint:velocity];
sizeAnimation.springBounciness = 1.0f;
sizeAnimation.dynamicsFriction = 1.0f;
[self.testView.layer pop_addAnimation:sizeAnimation forKey:@"sizeAnimation"]; //大小变换
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可以看到两个pop弹跳动画，主要是名字不同kPOPLayerPosition ，kPOPLayerSize。
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