问题
Set Target/General/Deployment info to Hide status bar. Set None for Status Bar in VCs in storyboards. Added the following code to all VCs.
override var prefersStatusBarHidden: Bool {
return true
}
Briefly hides status bar but immediately reappears.
回答1:
Only the prefersStatusBarHidden of the root-level view controller matters — here, the split view controller. The split view controller wants a status bar; it gets a status bar. That is all that matters.
You could try subclassing UISplitViewController, setting prefersStatusBarHidden in your subclass, and using that subclass in the app.
来源：https://stackoverflow.com/questions/39944675/hiding-status-bar-not-working-swift-3-xcode-8-0