如何获得服务器响应，如果服务器响应是“成功”之后显示警报由JSON使用目标c

NSString *data = [NSString stringWithFormat:@"username=%@&password=%@",usertxt.text,pwdtxt.text,[NSNumber numberWithBool:YES]]; NSData *postData = [data dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES]; NSString *postLength = [NSString stringWithFormat:@"%d", [postData length]]; 

//预先发送URL请求发送数据。

 NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init] ; connection=[[NSURLConnection alloc] initWithRequest:request delegate:self]; NSString *url = [NSString stringWithFormat:URL_PATH]; [request setURL:[NSURL URLWithString:url]]; [request setHTTPMethod:@"POST"]; [request setValue:postLength forHTTPHeaderField:@"Accept"]; [request setHTTPBody:postData]; [request setTimeoutInterval:7.0]; NSURLResponse *_response; NSError *error; NSData *urlData = [NSURLConnection sendSynchronousRequest:request returningResponse:&_response error:&error]; NSString *str=[[NSString alloc]initWithData:urlData encoding:NSUTF8StringEncoding]; 

//打印服务器响应

 NSLog(@"Login response:%@",str); 

//将JSONstringparsing为NSDictionary

  NSDictionary* json = [NSJSONSerialization JSONObjectWithData:urlData options:kNilOptions error:&error]; 

Answer 1

尝试这个
不需要使用JSON只需尝试此代码即可从服务器获取响应

 NSString *string= [[NSString alloc]initWithFormat:@"url"]; NSLog(@"%@",string); NSURL *url = [NSURL URLWithString:string]; NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url]; [request setHTTPMethod:@"POST"]; NSURLResponse *response; NSError *err; NSData *responseData = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&err]; NSLog(@"responseData: %@", responseData); NSString *str = [[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding]; NSLog(@"responseData: %@", str); NSString *str1 = @"1"; if ([str isEqualToString:str1 ]) { UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"Successfully" message:@"" delegate:nil cancelButtonTitle:@"Ok" otherButtonTitles:nil, nil]; [alert show]; } else { UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"Try Again" message:@"" delegate:self cancelButtonTitle:@"Try Later" otherButtonTitles:@"Call", nil]; alert.tag = 1; [alert show]; } 

如果你的响应string是success ，把它放在@"1"