如何使用Quartz 2D将阴影添加到UIImage或UIImageView？ [英] How to use Quartz 2D to add drop shadow to an UIImage or UIImageView?

问题描述

如何使用Quartz 2D将阴影添加到 UIImage 或 UIImageView ？

How do I use Quartz 2D to add drop shadow to an UIImage or UIImageView ?

任何代码示例？

推荐答案

imageView.layer.shadowColor = [UIColor blackColor].CGColor;
imageView.layer.shadowOffset = CGSizeMake(0, 1);
imageView.layer.shadowOpacity = 1;
imageView.layer.shadowRadius = 1.0;

不要忘记 #import< QuartzCore / QuartzCore.h>

Don't forget to #import <QuartzCore/QuartzCore.h> in your implementation.

编辑：

添加@Luke的评论：

Adding in @Luke's comment:

只是有点困难，可能会节省一些其他人一段时间，确保你没有设置<$ c $ <> code>至在您的视图中显示，否则阴影将不会

Just a little gotcha that might save some other people some time make sure you have not set layer.masksToBounds to YES on your view otherwise the shadow will not appear.

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