How to add a safe area programmatically

问题:

When you open the view, it will look like the image below,

i Phone x open view

i Phone 8 open view

For iphone x, I would like to add a safe area programmatically in the current view.

The source to try is as follows.

UIView *view = self.view;

if (@available(iOS 11.0, *)) {
    UILayoutGuide * guide = view.safeAreaLayoutGuide;
    [view.topAnchor constraintEqualToAnchor:guide.topAnchor].active = YES;
    [view.bottomAnchor constraintEqualToAnchor:guide.bottomAnchor].active = YES;
}

I suppose to apply this source, but I do not know what to do.

please answer about my question.!

回答1:

Here is sample code for Safe Area Layout. Try this in Objective-C and see:

UIView * myView = // initialize view using IBOutlet or programtically

myView.backgroundColor = [UIColor red];
myView.translatesAutoresizingMaskIntoConstraints = NO;

UILayoutGuide * guide = self.view.safeAreaLayoutGuide;
[self.myView.leadingAnchor constraintEqualToAnchor:guide.leadingAnchor].active = YES;
[self.myView.trailingAnchor constraintEqualToAnchor:guide.trailingAnchor].active = YES;
[self.myView.topAnchor constraintEqualToAnchor:guide.topAnchor].active = YES;
[self.myView.bottomAnchor constraintEqualToAnchor:guide.bottomAnchor].active = YES;

// Refresh myView and/or main view
[self.view layoutIfNeeded];
//[self.myView layoutIfNeeded];

Ref from: Use Safe Area Layout programmatically

Result: