我正在使用Xcode 9.2 / iOS 10和Swift，根据来自https://blog.gaelfoppolo.com/detecting-user-inactivity-in-ios-application-684b0eeeef5b的出色教程示例的信息来检测iOS应用程序中的用户不活动状态，我所做的增强功能是在调用viewDidLoad时启动计时器并添加applicationDidTimeout中的贪睡功能。在编译时，将显示以下错误消息：“实例成员'snoozeTimer'不能用于'TimerApplication'类型；您是要使用此类型的值吗？”

applicationDidTimeout将使用snoozeTimer来控制是否需要另一个计时器警报，具体取决于要添加到该方法的其他逻辑。

调用startTimer和snoozeTimer的正确方法是什么？

代码清单如下所示：

main.swift

UIApplicationmain(
   CommandLine.argc,UnsafeMutableRawPointer(CommandLine.unsafeArgv)
      .bindMemory(
         to: UnsafeMutablePointer<Int8>.self,capacity: Int(CommandLine.argc)),NSStringFromClass(TimerApplication.self),NSStringFromClass(AppDelegate.self)
)

AppDelegate.swift

import UIKit

import Foundation

extension Notification.Name {

    static let appTimeout = Notification.Name("appTimeout")

}

//@UIApplicationmain
class AppDelegate: UIResponder,UIApplicationDelegate {

   var window: UIWindow?
   var backgroundTaskRunCount : Int = 0


   func application(_ application: UIApplication,didFinishlaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
      // Override point for customization after application launch.

      NotificationCenter.default.addobserver(self,selector: #selector(AppDelegate.applicationDidTimeout(notification:)),name: .appTimeout,object: nil
      )


      return true
   }

.   //other func
 .
  .

@objc func applicationDidTimeout(notification: Nsnotification) {
      backgroundTaskRunCount = backgroundTaskRunCount + 1

      print("application did timeout,perform actions. Count=",backgroundTaskRunCount)

      TimerApplication.snoozeTimer()
   }
}

TimerApplication.swift

import UIKit

class TimerApplication: UIApplication {

    private var wakeupInSeconds: TimeInterval {
        // 2 minutes for for timer to fire first time
        return 2 * 60
    }

    private let snoozeInSeconds: TimeInterval = 5

    // the timeout in seconds,after which should perform custom actions
    // such as disconnecting the user
    private var timeoutInSeconds: TimeInterval = 120

   private var idleTimer: Timer?

   // resent the timer because there was user interaction
   private func resetIdleTimer() {
      if timeoutInSeconds > 0 {
         if let idleTimer = idleTimer {
            idleTimer.invalidate()
         }

         idleTimer = Timer.scheduledTimer(timeInterval: timeoutInSeconds,target: self,selector: #selector(TimerApplication.timeHasExceeded),userInfo: nil,repeats: false
         )
      } else {
        stopTimer()
      }
   }

   // if the timer reaches the limit as defined in timeoutInSeconds,post this notification
   @objc private func timeHasExceeded() {
      NotificationCenter.default.post(name: .appTimeout,object: nil
      )
   }

   override func sendEvent(_ event: UIEvent) {

      super.sendEvent(event)

      if idleTimer != nil {
         self.resetIdleTimer()
      }

      if let touches = event.allTouches {
         for touch in touches where touch.phase == UITouchPhase.began {
            self.resetIdleTimer()
         }
      }
   }

    func startTimer() {
       self.timeoutInSeconds = wakeupInSeconds
       self.resetIdleTimer()
    }

    func stopTimer() {
        if let idleTimer = idleTimer {
            idleTimer.invalidate()
        }
    }

    func snoozeTimer() {
        self.timeoutInSeconds = snoozeInSeconds
    }
}

ViewController.swift

import UIKit

class ViewController: UIViewController {

   override func viewDidLoad() {
      super.viewDidLoad()
      // Do any additional setup after loading the view,typically from a nib.

    TimerApplication.startTimer()

   }

   override func didReceiveMemoryWarning() {
      super.didReceiveMemoryWarning()
      // Dispose of any resources that can be recreated.
   }


}