1 import React
2 
3 func DevMenuUIEdgeInsetsEqualToEdgeInsetsWithThreshold(_ insets1: UIEdgeInsets, _ insets2: UIEdgeInsets, _ threshold: CGFloat) -> Bool {
4   return abs(insets1.left - insets2.left) <= threshold &&
5     abs(insets1.right - insets2.right) <= threshold &&
6     abs(insets1.top - insets2.top) <= threshold &&
7     abs(insets1.bottom - insets2.bottom) <= threshold
8 }
9 
10 extension UIView {
11   var nativeSafeAreaSupport: Bool {
12     return responds(to: #selector(getter: safeAreaInsets))
13   }
14 
15   func safeAreaInsetsOrEmulate() -> UIEdgeInsets {
16     if nativeSafeAreaSupport {
17       if #available(iOS 11.0, *) {
18         return safeAreaInsets
19       }
20     }
21     return emulatedSafeAreaInsets()
22   }
23 
24   func emulatedSafeAreaInsets() -> UIEdgeInsets {
25     guard let vc = self.reactViewController() else {
26       return .zero
27     }
28 
29     let topLayoutOffset = vc.topLayoutGuide.length
30     let bottomLayoutOffset = vc.bottomLayoutGuide.length
31     var safeArea = vc.view.bounds
32     safeArea.origin.y += topLayoutOffset
33     safeArea.size.height -= topLayoutOffset + bottomLayoutOffset
34     let localSafeArea = vc.view.convert(safeArea, to: self)
35     var safeAreaInsets = UIEdgeInsets.zero
36 
37     if localSafeArea.minY > bounds.minY {
38       safeAreaInsets.top = localSafeArea.minY - bounds.minY
39     }
40 
41     if localSafeArea.maxY < bounds.maxY {
42       safeAreaInsets.bottom = bounds.maxY - localSafeArea.maxY
43     }
44 
45     return safeAreaInsets
46   }
47 }
48