UIView subclass that bends its edges when its position changes.

Related tags

Animation AHKBendableView
Overview

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:

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Comments
  • AHKBendableView reacting to scroll view velocity

    AHKBendableView reacting to scroll view velocity

    I'd like to make a scroll view that contains a single AHKBendableView which responds to vertical scroll velocity.

    It looks like BendableView updates itself based on current/previous position inside animation blocks, but it's not clear to me how this would work in a scroll view. Sorry I'm pretty new at this stuff.

    I could map velocity -> control points like BRFlabbyTable does. But maybe the animation feels more realistic using springs as you do, and maybe it's less code to write. You think this is a good use case for AHKBendableView, maybe by plugging vertical velocity into it, or by manually tracking it's position to match the scrollview?

    opened by SimplGy 3
  • Use Mesh Transform?

    Use Mesh Transform?

    I've just learned (while going through my Pocket queue) about mesh transforms on iOS. BCMeshTransformView could be used to bend the whole view, not just its background.

    enhancement 
    opened by fastred 0
Owner
Arek Holko
Arek Holko
GitHub http://holko.pl/2014/06/28/action-sheet-follow-up/
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