YouQi/Pods/SKPhotoBrowser/SKPhotoBrowser/UIApplication+UIWindow.swift

//
//  UIApplication+UIWindow.swift
//  SKPhotoBrowser
//
//  Created by Josef Dolezal on 25/09/2017.
//  Copyright © 2017 suzuki_keishi. All rights reserved.
//

import Foundation

internal extension UIApplication {
    var preferredApplicationWindow: UIWindow? {
        // Since delegate window is of type UIWindow??, we have to
        // unwrap it twice to be sure the window is not nil
        if let appWindow = UIApplication.shared.delegate?.window, let window = appWindow {
            return window
        } else if let window = UIApplication.shared.keyWindow {
            return window
        }

        return nil
    }
}