为什么在iOS加载屏幕后出现空白？

Question

My app is displaying the correct iOS loading screen, and then a white screen.

Is it incumbent on me to overwrite the white screen appropriately? Before I added loading screens, I had a background view loaded, and images on top of it. Now it just is plain white.

For displaying the background correctly, does it make sense to have a draw screen method, called from viewDidLoad and from viewDidRotate, and tackle things from there?

I have a ContainerView under a ScrollView, and the ScrollView is provisionally 150x150, which should even if it clips things show non-white pixels inside.

What should I do to get real diagnostics?

Answer 1

My app is displaying the correct iOS loading screen, and then a white screen.

Something is wrong with your initial view controller, or with the view that it's supposed to load.

Is it incumbent on me to overwrite the white screen appropriately?

The white screen is probably either your app's window or an empty view. Normally, your app delegate would create a root view controller and load its view into the app's window (possibly automatically if you're using storyboards). It sounds like something happened to adversely affect that process -- your storyboard was changed, your Info.plist (which points the app to the right storyboard or .xib file) was changed, etc.

For displaying the background correctly, does it make sense to have a draw screen method, called from viewDidLoad and from viewDidRotate, and tackle things from there?

That shouldn't be necessary, at least in the context of your current problem.

What should I do to get real diagnostics?

Use the debugger. Is the window's root view controller pointing to an instance of the correct class? If yes, does its view property point to the correct view? If yes, does the view contain the appropriate objects?