问题描述

在我的应用程序中，我正在加载一个资源繁重的视图，加载大约需要 1 到 2 秒.所以我将它加载到一个单独的线程中，如下所示:

In my app, I am loading a resource heavy view that takes about 1 to 2 seconds to load. So I am loading it in a separate thread like this:

hud = [[MBProgressHUD alloc] init];
[hud showWhileExecuting:@selector(loadWorkbench:) onTarget:self withObject:nil animated:YES];

但它从未出现，并且应用程序在最终用户看来是冻结的.有什么想法我哪里出错了吗?

however it never appears, and application looks frozen to the end user. any ideas where I have gone wrong?

推荐答案

是的.它不会出现，因为您从未告诉将 HUD 添加为窗口的子视图.尝试类似:

Yes. It does not appear because you never tell add the HUD as a subview of the window. try something like:

    // Should be initialized with the windows frame so the HUD disables all user input by covering the entire screen
    HUD = [[MBProgressHUD alloc] initWithWindow:[UIApplication sharedApplication].keyWindow];

    // Add HUD to screen
    [self.view.window addSubview:HUD];

    // Register for HUD callbacks so we can remove it from the window at the right time
    HUD.delegate = self;

    HUD.labelText = NSLocalizedString(@"Loading Workbench", nil);
    HUD.detailsLabelText = NSLocalizedString(@"please wait", nil);

    // Show the HUD while the provided method executes in a new thread
    [HUD showWhileExecuting:@selector(loadWorkbench:) onTarget:self withObject:nil animated:YES];

由于您将自己设置为 HUD 委托，因此还要添加以下委托方法:

Since you are setting yourself as the HUD delegate, also add the following delegate method:

- (void)hudWasHidden {
    // Remove HUD from screen 
    [HUD removeFromSuperview];

    // add here the code you may need

}

记得在相应的头文件中添加MBProgressHUDDelegate.

and remember to add MBProgressHUDDelegate in the corresponding header file.

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