UIKit Dynamics
2 likes1,941 views
UIKit Dynamics is an animation framework in iOS that uses physics-based behaviors like gravity, collisions, attachments and forces to simulate real-world interactions. It includes behaviors for gravity, collisions, attachments, snapping and pushing. While not fully accurate physics, it allows composable animations through combining multiple behaviors. The document provides examples of behaviors and how to compose them, as well as limitations and resources for learning more.
UIKit Dynamics
- 1. UIKit Dynamics Robert Brown Twitter: @robby_brown ADN: @robert_brown
- 2. What is UIKit Dynamics? A composable, reusable, declarative, real-world inspired animation and interaction system.
- 3. What is UIKit Dynamics? Based on real-world interactions Gravity Collisions Attachments Snap Forces Weight
- 4. Limitations It is possible to create behaviors that cant be satis鍖ed Not completely accurate physics Does not replace Core Animation, UIView animations, or motion effects Only supports 2D transforms
- 5. UIGravityBehavior Gravity is a simple vector Default is (0, 1) meaning straight down Default constant is 1000 px/sec2
- 6. 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
- 7. UIAttachmentBehavior Acts like a rope, string, or spring Damping is customizable Has a length and two anchor points Attachments are invisible
- 8. UISnapBehavior Locks position and angle Can use damping
- 9. UIPushBehavior Simple force vector 1 UIKit Newton accelerates a (100,100) view by 100 px/sec2
- 11. Composing Behaviors Effect Combination Bounce Gravity + collision Drag and snap Attachment then snap Lock screen Gravity + Collision + Attachment + Push Magnet Multiple push
- 12. Demo
- 13. Questions?
- 14. Want to Learn More? WWDC 2013 Session 206 WWDC 2013 Session 221 UIKit Dynamics Catalog Sample