iOS nsurlconnection 回調方法無效的分析！

標籤：

 dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{        NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:[NSURL URLWithString:urlStr] cachePolicy:NSURLRequestReloadIgnoringLocalCacheData timeoutInterval:CONNECTIONT_TIMEOUT];        NSString *encodedStr = [body stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];        NSData *sendData = [encodedStr dataUsingEncoding:NSUTF8StringEncoding allowLossyConversion:YES];        NSString *dataLengthStr =[NSString stringWithFormat:@"%lu",(unsigned long)[sendData length]];        [request setValue:dataLengthStr forHTTPHeaderField:@"Content-Length"];        [request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];        [request setHTTPMethod:@"POST"];        [request setHTTPBody:sendData];        self.connection = [NSURLConnection connectionWithRequest:request delegate:self];    });

這是一個在主線程中執行的代碼，執行結果有問題，無法收到網路回掉。

分析待續。。。

需要研究為什麼connection不能阻止線程結束！什麼東西能阻止？？

iOS nsurlconnection 回調方法無效的分析！