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我有一个登录视图，用户将用于登录到我的应用程序。 我使用NSURLConnection Asynchrounous请求块连接到我的Web服务并来回传递数据。iOS - NSURLConnection异步请求一次，然后失败（挂起）第二次尝试
我有一个奇怪的问题，如果用户第一次登录，它工作正常。但是，如果他们注销，然后尝试再次登录请求发送，但从来没有响应（我设置所有场景的alertviews;即超时，数据=无，错误！=零等）。它只是与我显示的加载屏幕坐在那里，并从不做任何事情。
我是否错过了什么？
[NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse *response, NSData *data, NSError *error)
{
if ([data length] > 0 && error == nil){
if(data != nil) {
//Handle Data Here
.............
} else {
[loadingView removeFromSuperview];
loadingView = nil;
BlockAlertView *alert = [BlockAlertView alertWithTitle:@"Network Error" message:@"Network connection was successful, but there was a problem with data transfer.\nPlease try again."];
[alert setCancelButtonWithTitle:@"OK" block:nil];
[alert show]; }
}
else if ([data length] == 0 && error == nil){
[loadingView removeFromSuperview];
loadingView = nil;
BlockAlertView *alert = [BlockAlertView alertWithTitle:@"Network Error" message:@"Network connection was successful, but there was a problem with data transfer.\nPlease try again."];
[alert setCancelButtonWithTitle:@"OK" block:nil];
[alert show];
}
else if (error != nil && error.code == NSURLErrorTimedOut){
[loadingView removeFromSuperview];
loadingView = nil;
BlockAlertView *alert = [BlockAlertView alertWithTitle:@"Network Error" message:@"The network request timed out.\nPlease check your internet connection and try again."];
[alert setCancelButtonWithTitle:@"OK" block:nil];
[alert show];
}
else if (error != nil){
[loadingView removeFromSuperview];
loadingView = nil;
BlockAlertView *alert = [BlockAlertView alertWithTitle:@"Network Error" message:@"There was a problem connecting to the network.\nPlease check your internet connection and try again."];
[alert setCancelButtonWithTitle:@"OK" block:nil];
[alert show];
}
}];