NSMutableURLRequest发送两次

问题描述：

我的NSMutableURLRequest正在向PHP发送两次字符串。我究竟做错了什么？NSMutableURLRequest发送两次

- (void)viewDidLoad { 

// Printando os Dados 

///// 

NSString *endereco = [[NSString alloc] initWithFormat:@"%@ - CEP: %@", self.sharedData.dataEndereco, self.sharedData.dataCEP]; 


NSMutableURLRequest *request = 
[[NSMutableURLRequest alloc] initWithURL: 
[NSURL URLWithString:@"http://localhost/dev/mcomm/pedido.php"]]; 
NSLog(@"ENVI"); 

[request setHTTPMethod:@"POST"]; 
NSString *postString = [[NSString alloc] initWithFormat:@"nome=%@&email=%@&endereco=%@&produto=%@&marca=%@&preco=%@&codigo=%@&variacao=%@&parcelas=%@&valorParcelas=%@&cartao=%@&numCartao=%@&codCartao=%@&vencCartao=%@&nomeCartao=%@", self.sharedData.dataNome, self.sharedData.dataEmail, endereco, self.sharedData.dataProd, self.sharedData.dataMarca, self.sharedData.dataPreco, self.sharedData.dataCodigo, self.sharedData.dataVariacao, self.sharedData.numParcelas, self.sharedData.valorParcelas, self.sharedData.cartao, self.sharedData.numeroCartao, self.sharedData.codigoCartao, self.sharedData.dataVencimento, self.sharedData.nomeImpressoCartao]; 

[request setValue:[NSString 
        stringWithFormat:@"%d", [postString length]] 
forHTTPHeaderField:@"Content-length"]; 

[request setHTTPBody:[postString 
         dataUsingEncoding:NSUTF8StringEncoding]]; 

[[NSURLConnection alloc] 
initWithRequest:request delegate:self]; 

[UIApplication sharedApplication].networkActivityIndicatorVisible = YES; 
[loaderAtividade startAnimating]; 


//get response 
NSHTTPURLResponse* urlResponse = nil; 
NSError *error = [[NSError alloc] init]; 
NSData *responseData = [NSURLConnection sendSynchronousRequest:request returningResponse:&urlResponse error:&error]; 
NSString *result = [[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding];

答

该第一请求是由启动：

[[NSURLConnection alloc] initWithRequest:request delegate:self];

，第二个是由函数发送：

[NSURLConnection sendSynchronousRequest:request returningResponse:&urlResponse error:&error];

小心的词，从apple documentation关于sendSynchronous：

重要提示：由于此调用可能需要几分钟的时间才能失败（特别是在iOS中使用蜂窝网络时），您绝不应该从GUI应用程序的主线程中调用此函数。

您应该实现NSURLConnection委托协议并避免发送同步请求。

答

除了丹尼尔的回答，您可以阻止第一次请求从通过实施initWithRequest射击：委托：startImmediately：没有

NSURLConnection *urlConnection = [[NSURLConnection alloc] initWithRequest:request delegate:self startImmediately:NO];

后来的后来，当你想开始新的异步请求，你只需拨打-start连接对象

[urlConnection start];

答

NSURLConnection *conn = ..... 
if(conn){ 
    ...... 

    [conn cancel];//! important! 
    [conn release]; 
}

Stopping a Connection

上

NSMutableURLRequest发送两次

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