Motion Manager is not working in Swift

Question

I am try to use motion manager in Swift but the log inside my update block never prints.

    var motionManager: CMMotionManager = CMMotionManager()
    motio         


        

Answer 1

That's because the motion manager instance is being thrown out when the method returns. You should make a property on your class to contain the motion manager. Additionally, it looks like you were only changing the manger's accelerometerUpdateInterval and then monitoring device motion changes. You should set the deviceMotionUpdateInterval property instead.

import CoreMotion

class ViewController: UIViewController {
    let motionManager = CMMotionManager()

    override func viewDidLoad() {
        super.viewDidLoad()

        motionManager.deviceMotionUpdateInterval = 0.01
        motionManager.startDeviceMotionUpdates(to: OperationQueue.current!) { deviceManager, error in
            print("Test") // no print
        }

        print(motionManager.isDeviceMotionActive) // print false
    }
}