‘windows’ was deprecated in iOS 15.0: Use UIWindowScene.windows on a relevant window scene instead

‘windows’ was deprecated in iOS 15.0: Use UIWindowScene.windows on a relevant window scene instead

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windows の代わりに UIWindowScene.windows を使う
first が2回続くので要注意

iOS15 以前
UIApplication.shared.windows.first?.safeAreaInsets.bottom

iOS15 以降
(UIApplication.shared.connectedScenes.first as? UIWindowScene)?.windows.first?.safeAreaInsets.bottom