a header unexpectedly shows up in all view controllers in iOS 10 and lower

问题

all my view controllers and constraints are fine in iOS 11 and above but in iOS 10 and below a space created in all pages like the pictures below :

I tried even a simple web view in a viewcontroller with four constraints to safe area but I've got the same result.(good view in iOS 11 and above and a space to top in iOS 10 and below. and another strange thing is that some of my apps now have this problem and some don't :| . what should I do?

回答1:

Can you try this?

if #available(iOS 11.0, *) {
    scrollView.contentInsetAdjustmentBehavior = .never
} else {
    self.automaticallyAdjustsScrollViewInsets = false
}

Note: Use (tableView, collectionView) instead of scrollview if you are using one.

来源：https://stackoverflow.com/questions/53635727/a-header-unexpectedly-shows-up-in-all-view-controllers-in-ios-10-and-lower