以下代码片段为 v 添加了边框、边框半径和阴影，一个 UIView:

The following code snippet adds a border, border radius, and drop shadow to v, a UIView:

// border radius
[v.layer setCornerRadius:30.0f];

// border
[v.layer setBorderColor:[UIColor lightGrayColor].CGColor];
[v.layer setBorderWidth:1.5f];

// drop shadow
[v.layer setShadowColor:[UIColor blackColor].CGColor];
[v.layer setShadowOpacity:0.8];
[v.layer setShadowRadius:3.0];
[v.layer setShadowOffset:CGSizeMake(2.0, 2.0)];

Swift 5 版本:

Swift 5 Version :

// border radius
v.layer.cornerRadius = 30.0

// border
v.layer.borderColor = UIColor.lightGray.cgColor
v.layer.borderWidth = 1.5

// drop shadow
v.layer.shadowColor = UIColor.black.cgColor
v.layer.shadowOpacity = 0.8
v.layer.shadowRadius = 3.0
v.layer.shadowOffset = CGSize(width: 2.0, height: 2.0)

您可以调整设置以满足您的需要.

You can adjust the settings to suit your needs.

此外，将 QuartzCore 框架添加到您的项目中，并且:

Also, add the QuartzCore framework to your project and:

#import <QuartzCore/QuartzCore.h>

请参阅我的其他答案关于masksToBounds.

注意

这可能不适用于所有情况.如果您发现此方法干扰了您正在执行的其他绘图操作，请参阅此答案.

This may not work in all cases. If you find that this method interferes with other drawing operations that you are performing, please see this answer.