作为委托引用的对象范围 [英] Scope of object referenced as a delegate

问题描述

我需要确认。

我有这样的代码

@implementation A
    (void) read
    {
        NSURLConnection *conn = 
           [[NSURLConnection alloc] initWithRequest:request delegate:self];

        ...    
    }
@end

@implementation B
   (void) someFn() 
   {
      A anObject = [A alloc] init]
      [anObject read]
   }

@end

在连接完成之前，将 anObject 成为一个有效对象，因为它作为代理传递给NSURLConnection？

Would anObject be a valid object until connection finishes since it is passed as a delegate to NSURLConnection??

推荐答案

如果您使用ARC，那么我想这将会。

If you use ARC, then I suppose it will.

A 只有在连接结束时才可以释放，因为持有引用的连接是非常连接的。

A will only be releasable when the connection will be ended, since the one which is holding a reference is that very connection.

然后，您在 B 中执行另一个引用。

Then, you hold another reference to A with your implementation in B.

因此，如果 anObject 在 someFn（）中的某个时间未使用，并且内部引用需要它保持活着，它将有效，直到它没有内部参考。

So, if anObject is unused at sometime in someFn() AND has inside reference needing it to be kept alive, it'll be valid until it has no inside reference.

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