Flatten UIViews子视图到UIImage iPhone 3.0

问题描述

我有一个UIView有几个UIImageViews作为子视图。这些子视图中的每一个都应用了不同的仿射变换。我想要占用我的UIView的屏幕捕获，捕获它作为UIImage或一些其他图像表示。

我已经尝试的方法，渲染层到CGContext：

  [view.layer renderInContext：UIGraphicsGetCurrentContext（）]; 
  

不会保留我的子视图的定位或其他仿射变换。

$ b $

解决方案

请尝试以下操作：

  UIGraphicsBeginImageContext（self.view.frame.size）; 
 [self.view.layer renderInContext：UIGraphicsGetCurrentContext（）]; 
 UIImage * image = UIGraphicsGetImageFromCurrentImageContext（）; 
 UIGraphicsEndImageContext（）; 
  

I have a UIView that has several UIImageViews as subviews. Each of these subviews has had different affine transform applied. I would like to take what amounts to a screen capture of my UIView, capturing it as a UIImage, or some other image representation.

The method I have tried already, rendering the layers to a CGContext with:

[view.layer renderInContext:UIGraphicsGetCurrentContext()];

doesn't preserve the positioning or other affine transformations of my subviews.

I would really appreciate a kick in the right direction.

解决方案

Try this:

UIGraphicsBeginImageContext(self.view.frame.size);
[self.view.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

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