UIView subclass that bends its edges when its position changes.
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README.md

AHKBendableView

CocoaPods

BendableView is a UIView subclass that bends its edges when its position change is animated. Internally, BendableView contains CAShapeLayer, which acts as its background. The layer's path changes during animations, creating an effect of bending. Subviews stay intact. You can find a more extensive description on my blog: Recreating Skype's Action Sheet Animation and Follow-Up Post.

Demo GIF

Usage

BendableView contains three public properties:

var damping: CGFloat // set to animate the view's edges differently than the whole view (used in an internal spring animation)
var initialSpringVelocity: CGFloat // same as above
var fillColor: UIColor // "background" color of the bendable layer

You should set them before animating the position change of the view. I propose to use slightly lower values for damping and initialSpringVelocity than the values used when calling +animateWithDuration:delay:usingSpringWithDamping: initialSpringVelocity:options:animations:completion:, just like in this example:

let bv = BendableView(frame: CGRect(x: 0, y: 0, width: 100, height: 100))
view.addSubview(bv)

// bending setup
bv.fillColor = UIColor.redColor()
bv.damping = 0.7
bv.initialSpringVelocity = 0.8

UIView.animateWithDuration(0.5, delay: 0, usingSpringWithDamping: 0.9, initialSpringVelocity: 0.9, options: .BeginFromCurrentState | .AllowUserInteraction, animations: {
        bv.frame.origin = CGPoint(x: 200, y: 300)
        bv.frame.size = CGSize(width: 150, height: 150)
    }, completion: nil)

Have fun!

Example project

To run the example project, clone the repo, and open Example/AHKBendableView.xcodeproj.

Requirements

  • iOS 7.0
  • ARC

Installation

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

pod "AHKBendableView"

Author

Arkadiusz Holko: