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UIKit Dynamics
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Rob Brown
December 11, 2013
Technology
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67
UIKit Dynamics
A basic overview of UIKit dynamics. Demo here:
https://github.com/rob-brown/Demos
Rob Brown
December 11, 2013
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Transcript
UIKit Dynamics Robert Brown Twitter: @robby_brown ADN: @robert_brown
What is UIKit Dynamics? A composable, reusable, declarative, real-world inspired
animation and interaction system.
What is UIKit Dynamics? Based on real-world interactions Gravity Collisions
Attachments Snap Forces Weight
Limitations It is possible to create behaviors that can’t be
satisfied Not completely accurate physics Does not replace Core Animation, UIView animations, or motion effects Only supports 2D transforms
UIGravityBehavior Gravity is a simple vector Default is (0, 1)
meaning straight down Default constant is 1000 px/sec2
UICollisionBehavior Views can collide with boundaries and other views Views
can collide conditionally with other views Callbacks for when collisions begin and end (UICollisionBehaviorDelegate) Collisions have a CPU cost
UIAttachmentBehavior Acts like a rope, string, or spring Damping is
customizable Has a length and two anchor points Attachments are invisible
UISnapBehavior Locks position and angle Can use damping
UIPushBehavior Simple force vector 1 UIKit Newton accelerates a (100,100)
view by 100 px/sec2
UIDynamicItemBehavior friction resistance angularResistance elasticity density allowsRotation
Composing Behaviors Effect Combination Bounce Gravity + collision Drag and
snap Attachment then snap Lock screen Gravity + Collision + Attachment + Push Magnet Multiple push
Demo
Questions?
Want to Learn More? WWDC 2013 Session 206 WWDC 2013
Session 221 UIKit Dynamics Catalog Sample