如何向 UIButton 添加阴影?

How to add a drop shadow to a UIButton?(如何向 UIButton 添加阴影?)

问题描述

我想为 UIButton 添加阴影.我尝试使用 self.layer.shadow* 属性.这些属性在 UIView 中有效，但在 UIButton 中的行为不同.如果我能得到任何指示来绘制阴影，我将不胜感激.谢谢！

I would like to add a drop shadow to a UIButton. I tried to use self.layer.shadow* properties. Those properties work in UIView, but they behave differently in UIButton. I would really appreciate it if I could get any pointers to draw the drop shadow. Thank you!

self.layer.cornerRadius = 8.0f;
self.layer.masksToBounds = YES;
self.layer.borderWidth = 1.0f;

self.layer.shadowColor = [UIColor greenColor].CGColor;
self.layer.shadowOpacity = 0.8;
self.layer.shadowRadius = 12;
self.layer.shadowOffset = CGSizeMake(12.0f, 12.0f);

推荐答案

问题中只有一个小错误导致阴影不显示:masksToBounds:YES 也屏蔽了阴影！这是正确的代码:

There is only one tiny mistake in the question that causes the shadow to not be displayed: masksToBounds:YES also masks the shadow! Here's the correct code:

self.layer.cornerRadius = 8.0f;
self.layer.masksToBounds = NO;
self.layer.borderWidth = 1.0f;

self.layer.shadowColor = [UIColor greenColor].CGColor;
self.layer.shadowOpacity = 0.8;
self.layer.shadowRadius = 12;
self.layer.shadowOffset = CGSizeMake(12.0f, 12.0f);

不幸的是，这意味着我们不能在没有技巧的情况下同时屏蔽内容和阴影.

Unfortunately, this means we cannot mask the content and have a shadow at the same time without tricks.

记得#import <QuartzCore/QuartzCore.h>.

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