iOS 11 safe area layout guide backwards compatibility

Question

Is enabling Safe Area Layout Guides compatible to iOS below 11?

Answer 1

Simple Swift 4 Solution:

First set to top constraint priority to the safe area to 750, then:

override func viewDidLayoutSubviews() {
    super.viewDidLayoutSubviews()
    
    if #available(iOS 11, *) {
        // Safe area constraints already set.
    } else {
        NSLayoutConstraint.activate([
            self.yourView.topAnchor.constraint(equalTo: topLayoutGuide.bottomAnchor)
        ])
    }
}