NumberMorphView a view like label for displaying numbers which animate with transition using a technique called number tweening or number morphing.

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To run the example project, clone the repo, and run pod install from the Example directory first.

Interface builder

  1. Drag a UIView into your view controller.
  2. Change the class to NumberMorphView in the identity inspector.
  3. Change intrinsic size from default to placeholder in the size inspector.
  4. Create an IBOutlet in your view controller.

Set the digit of number view as shown below:

numberView.currentDigit = 5;

Animate to nextDigit as shown below.

numberView.nextDigit = 8;

From code

NumberMorphView can be used with or without auto layout. Usage of intrinsic content size is recommended.
Preferred aspect ratio of the view is 13 : 24.

let numberView = NumberMorphView();
numberView.fontSize = 64;
numberView.currentDigit = 5;
let preferedSize = numberView.intrinsicContentSize();
numberView.frame = CGRect(x: 10, y: 10, width: preferedSize.width, height: preferedSize.height);

dispatch_after(5, dispatch_get_main_queue()) {
    numberView.nextDigit = 7;

Note: Intrinsic content size is changed after setting fontSize.

Customizing animations

  • To set the animation duration:
numberView.animationDuration = 4;
  • To change the type of animation, set the interpolator.
numberView.interpolator = NumberMorphView.SpringInterpolator();

Already available interpolators are LinearInterpolator, OvershootInterpolator, SpringInterpolator, BounceInterpolator, AnticipateOvershootInterpolator, and CubicHermiteInterpolator. Also you can add new interpolators. The interpolator class needs to conform to InterpolatorProtocol as shown below:

class MyLinearInterpolator: InterpolatorProtocol {
    func getInterpolation(x: CGFloat) -> CGFloat {
        return x;


  • iOS 8.0+
  • Swift 2.2


NumberMorphView is available through CocoaPods. To install
it, simply add the following line to your Podfile:

pod 'NumberMorphView', '0.2.0'


Abhinav Chauhan


NumberMorphView is available under the MIT license. See the LICENSE file for more info.