如何从UIView的内容获取CGImageRef？ [英] How to obtain a CGImageRef from the content of an UIView?

问题描述

我有一个UIView，我在其中绘制一些东西-drawRect：。现在我需要一个CGImageRef从这个图形上下文或位图的UIView。

I have an UIView where I was drawing some stuff inside -drawRect:. Now I need a CGImageRef from this graphics context or bitmap of the UIView. Is there an easy way to get that?

推荐答案

像这样（从内存中输入，所以它可能不是100％正确） ：

Like this (typed from memory, so it might not be 100% correct):

// Get a UIImage from the view's contents
UIGraphicsBeginImageContextWithOptions(view.bounds.size, view.opaque, view.contentScaleFactor);
CGContextRef context = UIGraphicsGetCurrentContext();
[view.layer renderInContext:context];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

// Convert UIImage to CGImage
CGImageRef cgImage = image.CGImage;

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