How to detect if iPhone is in motion?

Question

I am trying to create an app (in swift) that will detect if a iPhone is in motion.

How would I go to approaching this?

Answer 1

You should look into getting the data from the accelerometer.

Here is an example of, how you could retrieve the information.

let motionManager = CMMotionManager()
if motionManager.isAccelerometerAvailable {
  let queue = OperationQueue()
  motionManager.startAccelerometerUpdates(to: queue, withHandler:
    {
      data, error in guard let data = data else { return }
      print("X = \(data.acceleration.x)")
      print("Y = \(data.acceleration.y)")
      print("Z = \(data.acceleration.z)")
    }
  )
} else {
  print("Accelerometer is not available")
}

Dont forget to import CoreMotion!

Updated solution Here is a working example of how to get the accelerometer data, if the device is moving with over 10 km/h.

import UIKit
import CoreMotion
import CoreLocation

class ViewController: UIViewController {

var timer = Timer()
var locationManager = CLLocationManager()
let motionManager = CMMotionManager()

override func viewDidLoad() {
    super.viewDidLoad()
    scheduledTimerWithTimeInterval() //Calling function with timer
    // Do any additional setup after loading the view, typically from a nib.
}

func scheduledTimerWithTimeInterval(){
    // Scheduling timer to Call the function **getSpeed** with the interval of 1 seconds
    timer = Timer.scheduledTimer(timeInterval: 1, target: self, selector: #selector(ViewController.getSpeed), userInfo: nil, repeats: true)
}


func getSpeed(){
    
    var speed: CLLocationSpeed = CLLocationSpeed()
        speed = Double((locationManager.location?.speed)!)
    
        print(String(format: "%.0f km/h", speed * 3.6)) //Current speed in km/h
    
    //If speed is over 10 km/h
    if(speed * 3.6 > 10 ){
        
        //Getting the accelerometer data
        if motionManager.isAccelerometerAvailable{
            let queue = OperationQueue()
            motionManager.startAccelerometerUpdates(to: queue, withHandler:
                {data, error in
                    
                    guard let data = data else{
                        return
                    }
                    
                    print("X = \(data.acceleration.x)")
                    print("Y = \(data.acceleration.y)")
                    print("Z = \(data.acceleration.z)")
                    
                }
            )
        } else {
            print("Accelerometer is not available")
        }
    
    }
}

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