Rigtht方式来实现Aysnchronous委托方法 [英] Rigtht way to implement Aysnchronous Delegate Methods

问题描述

考虑下面的情况。

-(void) foo {

    Object * obj = [[Object alloc] init];

    obj.delegate = self;

    [obj excuteAsync];
}

-(void) delegateMethodReturned {
    // do something
}

下面executeAync返回aynchronously后的某个时间。因此，我们无法安全地释放OBJ。什么是最好的设计模式，来实现这样的情况不宣的obj为伊娃。

Here executeAync returns aynchronously after sometime. Thus we cannot release obj safely. What is the best design pattern to implement such a situation without declaring obj as an iVar.

感谢

推荐答案

如果你可以针对iOS4的，你可以使用模块和GCD规避异步回调。

If you can target iOS4 you could circumvent the asynchronous callback using blocks and GCD.

dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
dispatch_async(queue, ^ {
    Object * obj = [[Object alloc] init];
    [obj excuteSync];
    // do something
    [obj release];
});

我发现这是很有帮助的在某些情况下，但您的里程可能会有所不同。

I have found this helpful in some situations but your mileage may vary.

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