import UIKit
import UserNotifications
 
@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
     
    var window: UIWindow?
     
    let notificationHandler = NotificationHandler()
     
    func application(_ application: UIApplication, didFinishLaunchingWithOptions
        launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
        //请求通知权限
        UNUserNotificationCenter.current()
            .requestAuthorization(options: [.alert, .sound, .badge]) {
                (accepted, error) in
                if !accepted {
                    print("用户不允许消息通知。")
                }
        }
         
        //向APNs请求token
        UIApplication.shared.registerForRemoteNotifications()
         
        return true
    }
     
    //token请求回调
    func application(_ application: UIApplication,
                     didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {
         //打印出获取到的token字符串
         print("Get Push token: \(deviceToken.hexString)")
    }
     
    func applicationWillResignActive(_ application: UIApplication) {
    }
     
    func applicationDidEnterBackground(_ application: UIApplication) {
    }
     
    func applicationWillEnterForeground(_ application: UIApplication) {
    }
     
    func applicationDidBecomeActive(_ application: UIApplication) {
    }
     
    func applicationWillTerminate(_ application: UIApplication) {
    }
}
 
//对Data类型进行扩展
extension Data {
    //将Data转换为String
    var hexString: String {
        return withUnsafeBytes {(bytes: UnsafePointer<UInt8>) -> String in
            let buffer = UnsafeBufferPointer(start: bytes, count: count)
            return buffer.map {String(format: "%02hhx", $0)}.reduce("", { $0 + $1 })
        }
    }
}

{
  "aps":{
    "alert":{
      "title":"hangge.com",
      "subtitle":"航歌",
      "body":"做最好的开发者知识平台"
    },
    "sound":"default",
    "badge":1
  }
}