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extension UIApplication {
    
    #if os(iOS)
    @available(iOS 13.0, *)
    static var customKeyWindow: UIWindow? {
        if #available(iOS 15.0, *) {
            let window =  UIApplication
                .shared
                .connectedScenes
                .compactMap {($0 as? UIWindowScene)?.keyWindow }

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extension UIViewController {
    
    func topVisibleViewController() -> UIViewController {
        
        /// A ---- present ---- B ---- present ---- C
        ///                  A is presentingViewController   (B.presentingViewController == A)
        /// anchor point B <
        ///                  C is presentedViewController    (B.presentedViewController == C)
        if self.presentedViewController != nil {
            return self.presentedViewController!.topVisibleViewController()

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import Combine

final class EventSubscription<S: Subscriber, C: UIControl>: Subscription where S.Input == C, S.Failure == Never {
    
    private var subscriber: S?
    private let control: C
    
    init(subscriber: S, control: C, event: UIControl.Event) {
        self.subscriber = subscriber

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extension Binding {
    
    func onChange(_ handler: @escaping (Value) -> Void) -> Binding<Value> {
        Binding {
            self.wrappedValue
        } set: { newValue in
            self.wrappedValue = newValue
            handler(newValue)
        }
    }

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/// findUniqueNum
/// eg: [1, 2, 4, 9, 2, 4, 1] ,find number 9
/// - Parameter arr: [Int]
/// - Returns: resut
func findUniqueNum(in arr: [Int]) -> Int {
    return arr.reduce(0) { $0 ^ $1 }
}

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/// 测量一段代码的执行时间
/// - Parameters:
///   - identifier: 标示执行代码的identifier
///   - operation: 执行的代码
func measureExecuteTime(identifier: String, operation: () -> Void) {
    let startTime = CFAbsoluteTimeGetCurrent()
    operation()
    let endTime = CFAbsoluteTimeGetCurrent()
    let duration = endTime - startTime
    print("\(identifier) execute for \(duration)s.")

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/// 以指定的宽度分割数组
/// - Parameters:
///   - arr: 任意数组
///   - each: 每几个一组
/// - Returns: 返回分组后二维数组
func splitArray<T>(arr: [T], by each: Int) -> [[T]] {

    var resultArray = [[T]]()

    for i in stride(from: 0, to: arr.count, by: each) {

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extension Date {
    
    /// 时间戳转为格式化时间
    ///
    /// - Parameter stamp: 时间戳
    /// - Returns: 格式化时间
    static func toMessageString(stamp: TimeInterval) -> String {
        let date = Date(timeIntervalSince1970: stamp)
        return toMessageString(date)

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//
//  UIDevice+XMUtils.h
//  AwesomeTips
//
//  Created by kangzubin on 2018/9/20.
//  Copyright © 2018 KANGZUBIN. All rights reserved.
//

#import <UIKit/UIKit.h>

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    /// 为UIView的内容生成一张图片
    ///
    /// - Parameter view: 生成图片的View
    /// - Returns: 返回生成的图片
    func generatePictureIn(view: UIView) -> UIImage? {
        UIGraphicsBeginImageContextWithOptions(view.bounds.size, false, 0)
        guard let ctx = UIGraphicsGetCurrentContext() else { return nil }
        view.layer.render(in: ctx)
        let newImage = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()