How do I retrieve accelerometer data correctly with Swift in iOS?

Question

I am trying to record the data from the iPhone\'s accelerometer (my own iPhone 5s) and set a label on the screen to that data using String(format: \"%.2f\", data) w

Answer 1

you can get value of x or y or z and print alert of value you want

motionManager.accelerometerUpdateInterval = 5.0
motionManager.startAccelerometerUpdates(to: OperationQueue.current!) { (data, error) in
        if let myData = data{
            print(myData)
            if myData.acceleration.y < -0.2{
                let alert = UIAlertController(title: "Message ", message: "new text", preferredStyle: UIAlertControllerStyle.alert)
                alert.addAction(UIAlertAction(title: "OK", style: UIAlertActionStyle.default, handler: nil))
                self.present(alert, animated: true, completion: nil)

            }
        }
}

Answer 2

NSHipster has a good article to talk about the core motion: http://nshipster.com/cmdevicemotion/

A better way to regularly update UI with motion data is to use the patter as shown in below:

if manager.accelerometerAvailable {
     manager.accelerometerUpdateInterval = 0.1
     manager.startAccelerometerUpdatesToQueue(NSOperationQueue.mainQueue()) {
     [weak self] (data: CMAccelerometerData!, error: NSError!) in
          accelX.text = String(format: "%.2f", data.acceleration.x)
     }
}