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我为 iOS 应用程序构建了一个 Rails 后端，它允许用户仅在授权设备后才能访问 RESTful API。基本上授权是通过检索令牌来管理的。

当用户提交用户名和密码时，网络服务会被调用AFHTTPRequestOperation（见下面的代码）。我还向用户显示 HUD ( MBProgressHUD) 以跟踪请求的进度。我已经为成功和失败设置了回调，我想更新 HUD 并让它在屏幕上显示更新的消息几秒钟，然后再将其关闭。

//Set HUD
MBProgressHUD *hud = [MBProgressHUD showHUDAddedTo:self.view animated:YES];
hud.mode = MBProgressHUDModeIndeterminate;
hud.labelText = @"Authenticating";

//Set HTTP Client and request
NSURL *url = [NSURL URLWithString:@"http://localhost:3000"];
AFHTTPClient *httpClient = [[AFHTTPClient alloc] initWithBaseURL:url];
[httpClient setParameterEncoding:AFFormURLParameterEncoding]; //setting x-www-form-urlencoded
NSMutableURLRequest *request = [httpClient requestWithMethod:@"POST" path:@"/api/v1/tokens.json" parameters:@{@"password":_passwordField.text, @"email":_emailField.text}];

//Set operation
AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:request];

//Success and failure blocks
[operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject){
    NSError *error;
    NSDictionary* jsonFromData = (NSDictionary*)[NSJSONSerialization JSONObjectWithData:responseObject options:NSJSONReadingMutableContainers error:&error];
    NSLog(@"%@", jsonFromData);
    _statusLabel.text = @"Device authenticated!";
    hud.customView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"37x-Checkmark.png"]];
    hud.mode = MBProgressHUDModeCustomView;
    hud.labelText = @"Authenticated!";
    sleep(2);
    [MBProgressHUD hideAllHUDsForView:self.view animated:YES];
}
failure:^(AFHTTPRequestOperation *operation, NSError *error){
    NSLog(@"Error");
    sleep(2);
    _statusLabel.text = @"Wrong username or password!";
    [MBProgressHUD hideAllHUDsForView:self.view animated:YES];
}];

当成功/失败操作回调被调用时：

  • 我尝试更新HUD模式和文本；
  • 我等sleep()了几秒钟；
  • 我解散了HUD [MBProgressHUD hideAllHUDsForView:self.view animated:YES];；

我也尝试dispatch_queue_t dispatch_get_main_queue(void);在主线程上使用并运行 HUD 更新，但无济于事。

关于我做错了什么的任何想法？

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