How to detect shake gesture using Swift?

To detect a shake gesture in iOS UIKit provides three different methods, let’s see them one by one.

Method 1 − When the shake gesture begins.

override func motionBegan(_ motion: UIEvent.EventSubtype, with event: UIEvent?) {
// code you want to implement
}

Method 2 − When the shake gesture ends.

override func motionEnded(_ motion: UIEvent.EventSubtype, with event: UIEvent?) {
// Code you want to implement.
}

Method 3 − when the shake gesture is cancelled.

override func motionCancelled(_ motion: UIEvent.EventSubtype, with event: UIEvent?) {
// code you want to implement.
}

Now let’s add some code in our motionBegan method,

override func motionBegan(_ motion: UIEvent.EventSubtype, with event: UIEvent?) {
   print(motion)
   if motion == .motionShake {
      print("shake was detected")
   }
}

Also add “self.becomeFirstResponder()” in your viewDidLoad() method. When we run the above code on simulator, and use debug to produce a shake gesture, below is the result that’s produced. We can modify the code above according to our use and perform different operations In our app.

Rishi Rathor

Published on 21-Jan-2019 16:35:07