Push Forces
UIKit Dynamics also allows for the application of force, called pushing. UIPushBehavior is slightly more complex to use than the previously covered behaviors, but it is fairly easy compared to most other physics engines. The sample uses a UICollisionBehavior object as in many of the previous demos. This ensures that the image view stays on the screen while push effects are applied.
A new UIPushBehavior behavior is created and initialized with a reference to an image view. For the time being, properties for angle and magnitude are set to 0.0.
The sample app also features a reference in the form of a small black square in the center of the screen.
animator = [[UIDynamicAnimator alloc] initWithReferenceView: ...
Get iOS Components and Frameworks: Understanding the Advanced Features of the iOS SDK now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
