UIView与阴影 [英] UIView with shadow

问题描述

我试图在一个简单的UIView对象周围创建一个阴影，它添加在UIViewController的视图顶部。
这是最直接的方法是什么？

I'm trying to create a shadow around a simple UIView object which is added on top of a UIViewController's view. what's the most straight forward way of doing this?

推荐答案

首先，确保导入Quartz Core库：

First, be sure to import the Quartz Core library:

#import <QuartzCore/QuartzCore.h>

接下来，添加以下行以设置阴影的属性：

Next, add the following lines to set up the shadow's properties:

someView.layer.shadowColor = [[UIColor blackColor] CGColor];
someView.layer.shadowOffset = CGSizeMake(10.0f,10.0f);
someView.layer.shadowOpacity = .5f;
someView.layer.shadowRadius = 10.0f;

请记住，如果您将该视图的clipsToBounds属性设置为YES， 。

Keep in mind that if you have that view's clipsToBounds property set to YES, the shadow won't appear.

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