来自CALayer的UIImage - iPhone SDK [英] UIImage from CALayer - iPhone SDK

问题描述

在我的应用程序中，我创建了一个 CALayer （带有一些子图层 - CALayer由添加为子图层的形状组成）。

In my application, I have created a CALayer (with a few sublayers - the CALayer is composed of shapes added as sublayers).

我正在尝试创建一个 UIImage ，我将能够上传到服务器（我有这个代码）。
但是，我无法弄清楚如何将 CALayer 添加到 UIImage 。

I am trying to create a UIImage that I will be able to upload to a server (I have the code for this). However, I can't figure out how to add the CALayer to a UIImage.

这可能吗？任何建议都会非常好，非常感谢。

Is this possible? Any advice would be excellent and very appreciated.

非常感谢，
Brett

Many thanks, Brett

推荐答案

听起来好像要将图层渲染为UIImage。在这种情况下，下面的方法应该可以解决问题。只需将其添加到您的视图或控制器类，或在CALayer上创建一个类别。

Sounds like you want to render your layer into a UIImage. In that case, the method below should do the trick. Just add this to your view or controller class, or create a category on CALayer.

- (UIImage *)imageFromLayer:(CALayer *)layer
{
  UIGraphicsBeginImageContextWithOptions(layer.frame.size, NO, 0);

  [layer renderInContext:UIGraphicsGetCurrentContext()];
  UIImage *outputImage = UIGraphicsGetImageFromCurrentImageContext();

  UIGraphicsEndImageContext();

  return outputImage;
}

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