Swift Safe Area Inset

UIApplication+Ext.swift

//
//  UIApplication+Ext.swift
//  BottomSheetExample
//
//  Created by Aaron Lee on 2021/11/06.
//

import UIKit

extension UIApplication {
    
    var safeAreaInsets: UIEdgeInsets {
        
        if #available(iOS 11.0, *) {
            let window = UIApplication.shared.keyWindow
            
            guard let safeArea = window?.safeAreaInsets else { return .zero }
            
            return safeArea
        }
        
        if #available(iOS 13.0, *) {
            let window = UIApplication.shared.windows.first
            
            guard let safeArea = window?.safeAreaInsets else { return .zero }
            
            return safeArea
        }
        
        if #available(iOS 15.0, *) {
            let window = UIApplication.shared.connectedScenes
                .filter { $0.activationState == .foregroundActive }
                .first(where: { $0 is UIWindowScene })
                .flatMap { $0 as? UIWindowScene }?.windows
                .first(where: \.isKeyWindow)
            
            guard let safeArea = window?.safeAreaInsets else { return .zero }
            
            return safeArea
        }
        
        return .zero
        
    }
    
    var safeAreaTopInset: CGFloat {
        return safeAreaInsets.top
    }
    
    var safeAreaBottomInset: CGFloat {
        return safeAreaInsets.bottom
    }
    
    var safeAreaLeftInset: CGFloat {
        return safeAreaInsets.left
    }
    
    var safeAreaRightInset: CGFloat {
        return safeAreaInsets.right
    }
    
}