ios – 保持字典内的块

我有自己的方法,以块为参数.我想跟踪NSDictionary中的那个块.什么是最好的方法来添加到字典的块？

我尝试这个代码,但执行下面的行(setObject …)后,字典仍然是空的.我认为这是因为块不是类型NSObject.但是,这样做的正确方法是什么？

- (void)startSomething:(NSURLrequest*)request block:(void (^)(NSURLResponse*,NSData*,NSError*))handler {

    NSURLConnection *connection = [NSURLConnection connectionWithrequest:request delegate:self];

    [pendingrequests setObject:handler forKey:connection];
}

编辑：

没关系.我不知道我在想什么3分：

>块是对象
> Typo：setObject应该是SETVALue
> forKey是一个字符串,所以应该是[连接描述]或类似的东西

无论如何我现在解决了我的问题：

- (void)startSomething:(NSURLrequest*)request block:(void (^)(NSURLResponse*,NSError*))handler {

    NSURLConnection *connection = [NSURLConnection connectionWithrequest:request delegate:self];
    [pendingrequests SETVALue:handler forKey:[connection description]];
}

- (void)connectionDidFinishLoading:(NSURLConnection *)connection {

    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT,0),^(void) {

        void (^handler)(NSURLResponse*,NSError*);
        handler = [pendingrequests valueForKey:[connection description]];
        handler(nil,nil,nil);
    });
}

void (^handlerCopy)(NSURLResponse*,NSError*) = Block_copy(handler);
[Dict setObject:handlerCopy forKey:@"foo"];
Block_release(handlerCopy); // Dict will -retain/-release,this balances the copy.