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extension AppDelegate {
    /// 获取 App delegate
    static func mainDelegate() -> AppDelegate? {
        if let delegate = UIApplication.shared.delegate as? AppDelegate {
            return delegate
        }
        return nil
    }
}

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public extension UIDevice {
    /// 判断当前设备时间是否是12小时制？
    static func is12HourMode() -> Bool{
        if let formatStringForHours = DateFormatter.dateFormat(fromTemplate: "j", options: 0, locale: Locale.current) {
            return formatStringForHours.contains("a")
        }
        return false
    }
}

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// 需要 #import <CommonCrypto/CommonDigest.h>
// 对字符串进行MD5加密
+ (NSString *)MD5WithString:(NSString *)string
{
    const char *cStr = [string UTF8String];
    unsigned char digest[CC_MD5_DIGEST_LENGTH];
    CC_MD5( cStr, (uint32_t)strlen(cStr), digest);
    
    NSMutableString *output = [NSMutableString stringWithCapacity:CC_MD5_DIGEST_LENGTH * 2];
    

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public extension UIView {
    /// 添加阴影效果
    func setShadow(color: UIColor = UIColor.black, opacity: Float = 0.5, offset: CGSize = CGSize(width: 0, height: 0)) {
        // 添加阴影
        self.layer.shadowColor = color.cgColor
        // 阴影的透明度
        self.layer.shadowOpacity = opacity
        // 阴影的偏移
        self.layer.shadowOffset = offset
        // 避免离屏渲染带来卡顿

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//--------------------------------------------------------  define Model--------------------------------------------------

import Foundation

class TodoItem: NSObject, NSCoding {
    
    // Attribute of model
    var name: String = ""
    var isFinished: Bool = false

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  override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
      // Get navigation controller
      let naviController = segue.destination as! UINavigationController
      // Get view controller
      let todoDetailController = naviController.topViewController as! TodoDetailTableViewController

      if segue.identifier == "AddTodo" {
          todoDetailController.title = "Add todo"
          // Todo
      }

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func setNavigationBarAttributes() {
         //设置NavgationBar title 字体 和 颜色
        var titleTextAttributes = Dictionary<String, Any>()
        titleTextAttributes[NSForegroundColorAttributeName] = UIColor.black
        titleTextAttributes[NSFontAttributeName] = UIFont.systemFont(ofSize: 16)
        self.navigationController?.navigationBar.titleTextAttributes = titleTextAttributes

        //设置NavgationBar的背景颜色
        self.navigationController?.navigationBar.barTintColor = UIColor.white

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附：NSDateFormatter格式化参数如下：

G: 公元时代，例如AD公元
yy: 年的后2位
yyyy: 完整年
MM: 月，显示为1-12
MMM: 月，显示为英文月份简写,如 Jan
MMMM: 月，显示为英文月份全称，如 Janualy
dd: 日，2位数表示，如02
d: 日，1-2位显示，如 2

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/// 计算今年年龄 eg: 1992-03-19
func calculateThisYearAge(birthday: String) -> Int?{
    let dateFormatter = DateFormatter()
    dateFormatter.dateFormat = "yyyy-MM-dd"
    if let birthday = dateFormatter.date(from: birthday) {
        let gregorian = Calendar(identifier: .gregorian)
        let components = gregorian.dateComponents([Calendar.Component.year], from: birthday, to: Date())
        if let year =  components.year {
            return year + 1
        }

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// 正向传值
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    if let identifier = segue.identifier {
        if identifier == "ToBeauty" {
            let desVC = segue.destination as! BeautyViewController
            let index = pickerView.selectedRow(inComponent: 0)
            desVC.imageName = imageNames[index]
            desVC.name = names[index]
        }