如何屏蔽 UIView [英] How to mask a UIView

问题描述

我正在开发一个应用程序，在该应用程序中我通过代码绘制 UIView 并用 UIColor 填充它.接下来我想加载一个 mask.png 文件(没有透明度，只有黑白)并屏蔽 UIView 以改变其视觉外观.

I'm working on an app where I draw a UIView via code and I fill it with a UIColor. Next thing I want to load a mask.png file (no transparency, just black and white) and mask the UIView to change its visual appearance.

知道怎么做吗?

推荐答案

// Create your mask layer
CALayer* maskLayer = [CALayer layer];
maskLayer.frame = CGRectMake(0,0,yourMaskWidth ,yourMaskHeight);
maskLayer.contents = (__bridge id)[[UIImage imageNamed:@"yourMaskImage.png"] CGImage];

// Apply the mask to your uiview layer        
yourUIView.layer.mask = maskLayer;

记得导入 QuartzCore 并添加框架

Remember to import QuartzCore and add the framework

#import <QuartzCore/QuartzCore.h>

这很容易，但我在任何地方都没有找到答案！

It is very easy but I didn't find the answer anywhere!

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