如何截取 UIView 的屏幕截图? [英] How Do I Take a Screen Shot of a UIView?

问题描述

我想知道我的 iPhone 应用程序如何将特定 UIView 的屏幕截图作为 UIImage.

I am wondering how my iPhone app can take a screen shot of a specific UIView as a UIImage.

我尝试了这段代码，但得到的只是一张空白图像.

I tried this code but all I get is a blank image.

UIGraphicsBeginImageContext(CGSizeMake(320,480));
CGContextRef context = UIGraphicsGetCurrentContext();
[myUIView.layer drawInContext:context];
UIImage *screenShot = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

myUIView 的尺寸为 320x480，并且有一些子视图.这样做的正确方法是什么?

myUIView has dimensions 320x480 an it has some sub-views. What is the correct way to do this?

推荐答案

我想你可能想要 renderInContext，而不是 drawInContext.drawInContext 更像是一个你会覆盖的方法......

I think you may want renderInContext, not drawInContext. drawInContext is more a method you would override...

请注意，它可能不适用于所有视图，特别是大约一年前，当我尝试将其与实时摄像机视图一起使用时，它不起作用.

Note that it may not work in all views, specifically a year or so ago when I tried to use this with the live camera view it did not work.

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