使用Core Animation更改cornerRadius [英] Changing cornerRadius using Core Animation

问题描述

我试图通过以下方式更改按钮的角半径（OpenNoteVisible.layer）：

I am trying to change the corner radius of a button (OpenNoteVisible.layer) in the following way:

CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"cornerRadius"];
animation.timingFunction = [CAMediaTimingFunction     functionWithName:kCAMediaTimingFunctionLinear];
animation.fromValue = [NSNumber numberWithFloat:10.0f];
animation.toValue = [NSNumber numberWithFloat:0.0f];
animation.duration = 1.0;
[animation.layer setCornerRadius:140.0];
[OpenNoteVisible.layer addAnimation:animation forKey:@"cornerRadius"];

但是此代码在行[animation.layer setCornerRadius：140.0]上给出错误;
我无法理解为什么。我已经导入了Quartz核心框架。

But this code gives an error at the line [animation.layer setCornerRadius:140.0]; I can't understand why. I have imported Quartz core framework.

推荐答案

您正在动画对象的图层属性上设置角半径;此动画对象没有图层属性。

You're setting the corner radius on the layer property of the animation object; this animation object doesn't have a layer property.

您需要在要设置动画的图层上设置角半径，在本例中为 OpenNoteVisible 。您还需要确保动画对象的 toValue 与您在图层上设置的值相匹配，否则您将获得奇怪的动画。

You need to set the corner radius on the layer of the thing you're animating, in this case OpenNoteVisible. You also need to ensure the toValue of the animation object matches the value you're setting on the layer, otherwise you'll get odd animations.

您的代码现在应该是：

CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"cornerRadius"];
animation.timingFunction = [CAMediaTimingFunction     functionWithName:kCAMediaTimingFunctionLinear];
animation.fromValue = [NSNumber numberWithFloat:10.0f];
animation.toValue = [NSNumber numberWithFloat:140.0f];
animation.duration = 1.0;
[OpenNoteVisible.layer setCornerRadius:140.0];
[OpenNoteVisible.layer addAnimation:animation forKey:@"cornerRadius"];

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