如何使用 Quartz 2D 向 UIImage 或 UIImageView 添加阴影? [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 为 UIImage 或 UIImageView 添加投影?

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

有代码示例吗?

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;

不要忘记在你的实现中#import <QuartzCore/QuartzCore.h>.

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

添加@Luke 的评论:

Adding in @Luke's comment:

可能会为其他人节省一些时间的小问题，请确保您没有在您的视图上将 layer.masksToBounds 设置为 YES否则阴影不会出现.

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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