PerformSelector：withObject：afterDelay 未针对 MBProgressHUD 执行

Question

我对 MBProgressHUD 有以下方法：

 [progressHUD performSelector:@selector(hide:) 
                   withObject:[NSNumber numberWithBool:YES] 
                   afterDelay:kMessageHidingDelay];

此处的延迟为 2.0，但在 2.0 秒后不会调用 hide。我试图在隐藏函数中放置一个断点，但它没有到达那里。有什么想法吗？这是完整的代码：

progressHUD = [[MBProgressHUD alloc] initWithView:viewToAttach];

            // Add HUD to screen
            [viewToAttach addSubview:progressHUD];
            progressHUD.labelText = @"Logging In";
            progressHUD.removeFromSuperViewOnHide = YES;
            // Show the HUD while the provided method executes in a new thread

            [progressHUD show:YES];

Answer 1

可能会尝试在主线程上执行选择器（所有 UI 更改都必须在主线程上完成）？
performSelectorOnMainThread：

Answer 2

你必须隐藏 MBProgressHud

[progressHUD hide:YES];

Answer 3

要显示 MBProgressHUD，请使用此代码：-

  HUD = [[MBProgressHUD alloc] init];

  [self.view addSubview:HUD];

  HUD.delegate = self;

  [HUD showWhileExecuting:@selector(myTask) onTarget:self withObject:nil animated:YES];

  where myTask is

   - (void)myTask 
  {
     "Your Code"
  }

并且隐藏 MBProgressHud

 - (void)hudWasHidden:(MBProgressHUD *)hud
    {
       // Remove HUD from screen when the HUD was hidded
       [HUD removeFromSuperview];
       [HUD release];
   HUD = nil;
   }

，如果您想在 CostomView 中显示 Hud，请使用此代码

   HUD = [[MBProgressHUD alloc] init];

[self.view addSubview:HUD];

// Make the customViews 37 by 37 pixels for best results (those are the bounds of the build-in progress indicators)
HUD.customView = [[[UIImageView alloc] initWithImage:[UIImage imageNamed:@"Your Image Name.png"]] autorelease];

// Set custom view mode
HUD.mode = MBProgressHUDModeCustomView;

HUD.delegate = self;

HUD.labelText = @"Completed";

[HUD show:YES];

[HUD hide:YES afterDelay:3];

}