1. UIKIT DYNAMICS
2014

2. INTRODUCTION
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comprises four key elements
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The Reference View
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Dynamic Items
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The Dynamic Animator
Dynamic Behaviors
Demo

3. THE DYNAMIC ANIMATOR
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Responsible for coordinating the dynamic
behaviors
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Underlying physics engine to perform the
animation
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Represented by an instance of the
UIDynamicAnimator class

4. EXAMPLE
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@property (strong, nonatomic) UIDynamicAnimator *animator;
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self.animator = [[UIDynamicAnimator alloc] initWithReferenceView:self.view];
!
!
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Class reference: https://developer.apple.com/library/ios/documentation/uikit/reference/
UIDynamicAnimator_Class/Reference/Reference.html

5. THE REFERENCE VIEW
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Interaction are to take place
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This is typically the parent superclass view or
collection view of which the dynamic item views
are children.

6. EXAMPLE
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self.animator = [[UIDynamicAnimator alloc] initWithReferenceView:self.view];

7. DYNAMIC ITEMS
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the view elements within the user interface that
are to be animated
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includes the UIView and UICollectionView classes
and any subclasses there of (such as UIButton and
UILabel)

8. DYNAMIC BEHAVIORS
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configure the behavior which is to be applied to one or more dynamic items
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predefined dynamic behavior classes
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UIAttachmentBehavior
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UICollisionBehavior
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UIGravityBehavior
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UIDynamicItemBehavior
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UIPushBehavior
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The force can be specified as continuous or instantaneous
UISnapBehavior

9. EXAMPLE
Class *gravity = [[Class alloc]initWithItems:@[_view1, _view2]];
[self.animator addBehavior:gravity];

10. UICollisionBehavior Delegate
<UICollisionBehaviorDelegate>
[collision setCollisionDelegate:self];
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collisionBehavior:beganContactForItem:withBoundaryIdentifier:atPoint:
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collisionBehavior:beganContactForItem:withItem:atPoint:
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collisionBehavior:endedContactForItem:withBoundaryIdentifier:
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collisionBehavior:endedContactForItem:withItem:

11. UIDynamicItemBehavior
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AllowsRotation: Permitted to rotate during animation
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AngularResistence: The higher the value, the faster the item will stop
rotating
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Density: The mass of the item
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Friction: It slides against another item
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Resistence: The item will come to a complete stop during animation.
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Elasticity: Item will bounce

12. EXAMPLE
UIDynamicItemBehavior *behavior = [[UIDynamicItemBehavior alloc]
initWithItems:@[_view1, _view2]];
behavior.elasticity = 0.2;
behavior.resistance = 0.5;
[self.animator addBehavior:behavior];

13. UIDynamicBehavior
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Combined to create a single custom behavior

14. EXAMPLE
UIDynamicBehavior *customBehavior = [[UIDynamicBehavior alloc]init];
!
[customBehavior addChildBehavior:behavior];
[customBehavior addChildBehavior:attachment];
[customBehavior addChildBehavior:gravity];
[self.animator addBehavior:customBehavior];

15. UIkit dynamics architecture

16. I have no idea, what this guy was saying

17. Show me the demo

18. DEMO