如何自动释放CGImageRef? [英] How to Autorelease a CGImageRef?

问题描述

我有一个返回CGImageRef对象的方法.它包含此调用:

I have a method that returns a CGImageRef object. It contains this call:

CGImageRef posterFrame = [avAssetImage copyCGImageAtTime:time actualTime:nil error:&error];
...
return posterFrame;

据我所知，这种情况需要自动释放.但是我不知道该怎么做.我试过使用CFCollectable()，但是它不起作用.有什么想法吗?

This situation, as I understand it, calls for an autorelease. But I have no idea how to do it. I've tried using CFCollectable(), but it doesn't work. Any ideas?

推荐答案

如果您正在使用垃圾回收，请使用CFMakeCollectable(posterFrame).如果您使用的是传统内存管理，则非常简单:

If you're using garbage collection, use CFMakeCollectable(posterFrame). If you're using traditional memory management, it's very straightforward:

return (CGImageRef)[(id)posterFrame autorelease];

将CFTypeRef(在本例中为CGImageRef)强制转换为Objective-C对象指针，将其发送给-autorelease消息，然后将结果强制转换回CGImageRef.此模式适用于(几乎)与CFRetain()和CFRelease()兼容的任何类型.

You cast the CFTypeRef (in this case, a CGImageRef) to an Objective-C object pointer, send it the -autorelease message, and then cast the result back to CGImageRef. This pattern works for (almost) any type that's compatible with CFRetain() and CFRelease().

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