Question

我看到一些帖子提到这个问题，其中启动多个计时器可能是问题所在。但是，我不认为自己开始不止一个，也许我只是缺少一些东西？我很陌生。现在我正在尝试启动计时器，如果用户速度超过8 mps，并保持运行直到他停止足够长的时间让计时器用完。目前，即使满足条件，计时器仍会倒计时，以使其无效。

非常感谢您的帮助，这里的帮助总是非常受欢迎

import UIKit

class ViewController: UIViewController, {

    //Setup timer
    var timer = Timer()
    var seconds = 5
    var timerRunning = false

    //Timer countdown
    @objc func timeoutPeriod() {
        seconds -= 1
    }


    func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {

        if userLocation.speed > 8 && timerRunning == false {
            //flip running to True and start timer
            timerRunning = true
            seconds = 10
            Timer.scheduledTimer(timeInterval: 1, target: self, selector: (#selector(timeoutPeriod)), userInfo: nil, repeats: true)
            geoCoder.reverseGeocodeLocation(location, completionHandler: { (placemarks, error) -> Void in
                let placemark: CLPlacemark = placemarks![0]
                if let city = placemark.locality {
                    self.startingLocation = city
                    print("Starting Location: " + city)
                }
            })
        } else if userLocation.speed > 8 && timerRunning == true {
            seconds = 10
        } else if seconds == 0 {
            //end timer (hopefully)
            self.timer.invalidate()
            geoCoder.reverseGeocodeLocation(location, completionHandler: { (placemarks, error) -> Void in
                let placemark: CLPlacemark = placemarks![0]
                if let city = placemark.locality {
                    self.currentDateString = self.dateFormatter.string(from: self.date)
                    self.endingLocation = city
                    print("Ending Location: " + city)
                    self.timerRunning = false
                    self.seconds = 10
                }
            })
        }

    }

}

Answer 1

即使将其设置为nil，正常的计时器功能也不会失效，但是以下功能帮助我解决了这个问题。希望这会有所帮助

 self.myTimer = Timer.scheduledTimer(withTimeInterval: 1.0, repeats: true, block: { (timerValue) in
        if self.myTimer != nil {
            self.updateTimerLabel()  // call the selector function here
        }
    })

Answer 2

您的问题在于代码的这一部分。

Timer.scheduledTimer(timeInterval: 1, target: self, selector: (#selector(timeoutPeriod)), userInfo: nil, repeats: true)

您正在创建计时器，但未将其设置为您创建的Timer变量var timer = Timer()

要解决此问题，您只需正确设置Timer变量即可。

self.timer = Timer.scheduledTimer(timeInterval: 1, target: self, selector: (#selector(timeoutPeriod)), userInfo: nil, repeats: true)

Answer 3

为什么在我的情况下：首先在DidLoad()处跑步，然后在increasInt = 9处停下来。第二次由代码触发以使其自动运行：reset increasInt = -1 -运行速度更快并在increasInt > 11

之后继续

func aniDrag(ani: Double){
        dragTimer = Timer.scheduledTimer(timeInterval: ani, target: self, selector: #selector(updatedrag), userInfo: nil, repeats: true)
           }
       @objc  func updatedrag() { // dauIndex
           increasInt = increasInt + 1
        if (increasInt > -1 ) && ( increasInt < 10 ) {
           aniImage.image = UIImage(named: "ani" +  allLessonArray[realnIndex] + String(increasInt))!
            print(allLessonArray[realnIndex] + String(increasInt) )
        }
        if increasInt == 10 {
            if  dragTimer != nil {
                print("Timer Stop !!!!!")
                dragTimer.invalidate()}
                   }

        if increasInt > 11 {  print(increasInt)}
        }
   //test aniDrag(ani: 0.5)

计时器不会使swift 4无效

3 个答案: