imageWithCGImage和内存 [英] imageWithCGImage and memory

问题描述

如果我使用 [UIImage imageWithCGImage：] ，传入 CGImageRef ，然后释放 CGImageRef 或者UIImage在解除分配时是否会自行处理？

If I use [UIImage imageWithCGImage:], passing in a CGImageRef, do I then release the CGImageRef or does UIImage take care of this itself when it is deallocated?

文档不完全清楚。

最初我在CGImageRef中调用了 CGImageRelease 它到 imageWithCGImage：，但是导致在模拟器中发出 malloc_error_break 警告声称发生双重自由。 p>

Originally I called CGImageRelease on the CGImageRef after passing it to imageWithCGImage:, but that caused a malloc_error_break warning in the Simulator claiming a double-free was occurring.

推荐答案

我同意你的看法 - 这篇文档最适合这个API。根据你的经验，我会得出结论，你对这两个对象的生命负责 - UIImage 和 CGImageRef 。除此之外，你必须确保 CGImageRef 的生命周期至少与 UIImage 一样长明显的原因）。

I agree with you -- the documentation is muddled at best for this API. Based on your experiences, then, I would conclude that you are responsible for the lifetime of both objects - the UIImage and the CGImageRef. On top of that you have to make sure the lifetime of the CGImageRef is at least as long as the UIImage (for obvious reasons).

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