当核心数据存储迁移到新版本时，在 iPhone 应用程序的启动屏幕上显示 MBProgressHUD？
如果我的 iPhone 应用程序需要更新核心数据数据库，我想显示 MBProgressHUD当我的 iPhone 应用程序加载时向用户查看，这样他们就知道它正在运行而不是挂起。在迁移数据存储时，如何将 MBProgressHUD 添加到启动屏幕？通常我会将其附加到 UIViewController 的视图，但启动屏幕位于应用程序委托下方。这可以吗？
If my iPhone app needs to update the Core Data database, I would like to show an MBProgressHUD view to users while my iPhone app is loading, so they know that it's working and not hanging. How might I go about adding an MBProgressHUD to the splash screen while the data store is migrating? Normally I would attach it to the UIViewController's view, but the splash screen is under the app delegate. Is this possible to do?
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不，不可能在启动屏幕上覆盖任何内容，因为它是静态的。
但是，您可以将密集型过程延迟一段时间，直到应用程序加载，然后创建一个带有进度指示器的假启动屏幕，同时密集型工作在后台线程中进行。
No it is not possible to overlay anything over the splash screen as it's static.
You could, however, delay the intensive process for a bit until the app loads, then create a fake splash screen with the progress indicator while the intensive stuff goes on in a background thread.
您可以在应用程序委托头文件（或“全局”头文件）中创建一个
#define宏，如下所示：然后，当您想要访问应用程序委托属性时，您可以这样做您在应用程序中的任何位置导入了该标头（或全局标头）：
这可以帮助您在应用程序生命周期的任何时刻管理进度视图。
编辑
sudo rm -rf 是正确的，您无法在启动屏幕期间进行工作。但是您可以在应用程序委托的
-applicationDidFinishLaunching:方法中启动进度视图，然后在后台线程上启动工作。后台线程的工作完成后，请使用回调关闭进度视图。You could create a
#definemacro in your application delegate header file (or in a "globals" header), like so:Then, when you want access the application delegate property, you can do so like this anywhere in your application you have imported that header (or the globals header):
This may help you manage your progress view at any point in the app's life.
EDIT
sudo rm -rf is correct that you can't do work during the splash screen. But you can start your progress view in the app delegate's
-applicationDidFinishLaunching:method, and then launch work on a background thread. Once your background thread's work is finished, have a callback dismiss the progress view.