IPhone：核心动画：扩大在Y轴的视图

Question

我学习的Core Animation，并按照我的任务，我不得不展开/折叠在y轴层线性我有下面这段代码

CABasicAnimation *shrinkAnimation; 
shrinkAnimation = [CABasicAnimation animationWithKeyPath:@"transform"]; //use transform instead of bounds.size 
shrinkAnimation.repeatCount = 1; 
shrinkAnimation.autoreverses = NO; 
[shrinkAnimation setDuration:1.5]; 
shrinkAnimation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseIn]; 
shrinkAnimation.toValue = [NSValue valueWithCATransform3D:CATransform3DScale(myView.layer.transform, 1, 0.1, 1.0)]; 
[myView.layer addAnimation:shrinkAnimation forKey:@"bounds.size"]; 

但这里的问题是图层合同/同时从两端扩展，你能帮助我在一个方向上扩展/崩溃吗？

在此先感谢

问候

ANKIT

Answer 1

设置图层的anchor point到0,0或1,1或其他一些值，让你想不移动的边缘。

myView.layer.anchorPoint = CGPointMake(0,0);