How to count time while phone is shaking in swift?

Question

How to count time while phone is shaking in swift? want to get time measurement how long phone is shaking.

var timer = Timer()
var timeLeft = 0

override func motionBegan(_ motion: UIEvent.EventSubtype, with event: UIEvent?) {
    if(motion == .motionShake){
        timer = Timer.scheduledTimer(timeInterval: 1.0, target: self, selector: #selector(onTimerFires), userInfo: nil, repeats: true)
    }
}
override func motionEnded(_ motion: UIEvent.EventSubtype, with event: UIEvent?) {
    if(motion != .motionShake){
        print("MotionEnded")
        timer.invalidate()
    }
}

The timer is working endlessly. How to stop the timer when shaking stop...

score 1 · Answer 1 · answered May 24 '19 at 09:28

To measure the timeInterval between the shaking start time and end time using,

var startDate: Date?

override func motionBegan(_ motion: UIEvent.EventSubtype, with event: UIEvent?) {
    if(motion == .motionShake){
        self.startDate = Date()
    }
}

override func motionEnded(_ motion: UIEvent.EventSubtype, with event: UIEvent?) {
    if(motion != .motionShake){
        if let startDate = self.startDate {
            let timeInterval = Date().timeIntervalSince(startDate)
            print(timeInterval)
        }
    }
}

In the above code, I've stored the Date instance at which motion begins and when the motion ends timeInterval is calculated using the current date and the stored date.

`UIEvent` has a `timestamp` field, you can use that and save yourself the calls to `Date` — idz, May 24 '19 at 09:35

TagTaco · Answer 2 · 2019-05-24T10:01:21.993

0

Tested on a real device :

  var startShaking = CFAbsoluteTimeGetCurrent()

  override func motionBegan(_ motion: UIEvent.EventSubtype, with event: UIEvent?) {
    if motion == .motionShake {
      startShaking = CFAbsoluteTimeGetCurrent()
    }
  }

  override func motionEnded(_ motion: UIEvent.EventSubtype, with event: UIEvent?) {
    if motion == .motionShake {
      let shakingTime = CFAbsoluteTimeGetCurrent() - startShaking
      print("shaking for \(shakingTime) seconds")
    }
  }

edited May 24 '19 at 10:01

answered May 24 '19 at 09:36

TagTaco

143
5

It goes in the first "if" , but "else" is not working. – Mika Dior May 24 '19 at 09:45
Please see update, I tested it on a real device and it seems to works properly – TagTaco May 24 '19 at 10:02

score 0 · Answer 3 · answered May 24 '19 at 09:59

Try below code : Here the startDate is the timestamp when the shaking is started.

override func motionBegan(_ motion: UIEvent.EventSubtype, with event: UIEvent?) {
        startDate = Date()
        print("Motion begins")
    }

    override func motionEnded(_ motion: UIEvent.EventSubtype, with event: UIEvent?) {
        print("Motion ends")
        let endDate = Date()
        let difference = Calendar.current.dateComponents([.hour, .minute, .second, .nanosecond], from: startDate!, to: endDate)
        let formattedString = String(format: "%02ld %02ld %02ld %02ld", difference.hour!, difference.minute!, difference.second!, difference.nanosecond!)
        print(formattedString)
    }

The output will print the time difference in hour, minutes, seconds and nano seconds.

Hope this helps.

How to count time while phone is shaking in swift?

3 Answers3