如何向UIButton添加投影？

本文介绍了如何向UIButton添加投影？的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我想在UIButton中添加一个投影。我尝试使用self.layer.shadow *属性。这些属性在UIView中有效，但它们在UIButton中的表现不同。如果我能得到任何指针来绘制投影，我将非常感激。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 也掩盖阴影！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，这意味着我们无法在没有技巧的情况下屏蔽内容并同时拥有阴影。

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

请记住 #import< QuartzCore / QuartzCore.h> 。