iphone - 执行选择器 : withObject: afterDelay not executing for MBProgressHUD

Question

我对 MBProgressHUD 有以下方法:

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

这里的延迟是 2.0，但是它不会在 2.0 秒后调用 hide。我试图在隐藏函数中放置一个断点，但它没有到达那里。任何想法？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: