我手头有一个奇怪的问题。我有 UITextField。当点击按钮时，此 TextField 的宽度会调整大小。为此，我首先做了以下事情：
CGRect newbounds = originalBounds;
newbounds.size.width = newbounds.size.width/2;
[UIView beginAnimations:nil context:nil];
self.textField2.bounds = newbounds;
[UIView commitAnimations];
很简单，它奏效了。现在我继续前进并尝试对动画进行更多控制。为此，我使用以下内容进入 CABasicAnimation 的下一个级别：
CGRect newbounds = originalBounds;
newbounds.size.width = newbounds.size.width/2;
CABasicAnimation *animShrink = [CABasicAnimation animation];
animShrink.keyPath = @"bounds";
animShrink.toValue = [NSValue valueWithCGRect:newbounds];
animShrink.duration = 0.5;
animShrink.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
animShrink.delegate = self;
[self.textField2.layer addAnimation:animShrink forKey:@"shrink"];
那就是我在动画过程中遇到剪辑问题的时候，可以在以下位置看到：http ://coldstorage.macbonsai.com/public/cabasic_animation_clipping.png （因为根据 Stackoverflow，我“需要至少 10 个声望才能发布图像” ）。
所以我尝试了以下版本的动画：
CGRect newbounds = originalBounds;
newbounds.size.width = newbounds.size.width/2;
CABasicAnimation *animShrink = [CABasicAnimation animation];
animShrink.keyPath = @"bounds.size.width";
animShrink.fromValue = [NSNumber numberWithFloat:originalBounds.size.width];
animShrink.toValue = [NSNumber numberWithFloat:newbounds.size.width];
animShrink.duration = 0.5;
animShrink.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
animShrink.delegate = self;
[self.textField2.layer addAnimation:animShrink forKey:@"shrink"];
还是遇到了同样的问题。此时，我从 UITextField 中删除了所有约束并尝试了 CABasicAnimation 版本。同样的问题。在这一点上，我不知道还能做什么。任何帮助将不胜感激。
提前谢谢了。