uidynamicanimator | 易学教程

Lazy instantiating a UIDynamicAnimator with referenceView - Swift

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问题 I'm trying to lazy instantiate a UIDynamicAnimator in my code. I want to initialise it with an UIView as an IBOutlet I have. class ViewController: UIViewController { @IBOutlet var gameView : UIView @lazy var animator = UIDynamicAnimator(referenceView: gameView) ... I'm assuming this isn't working because the UIView isn't yet created because the animator property throws back an error saying it can't find the gameView. How can I get around this? 回答1: In the session video "Building Interruptible

UIDynamicAnimator view entering from outside of the reference bounds

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问题 I would like to animate dropping an object using the UIDynamicAnimator and gravity/collision/elasticity effects. I looked at Apple's sample app DynamicsCatalog, and it is quite straight forward, except for when the object starts off from the outside the bounds of its container. For example, this is the code taken from the sample app's APLCollisionGravityViewController.m file: UIDynamicAnimator *animator = [[UIDynamicAnimator alloc] initWithReferenceView:self.view]; UIGravityBehavior

Animating with UIDynamicAnimator when Autolayout is in play

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问题 I have a ViewController that has been configured in InterfaceBuilder to use AutoLayout for all of its subviews. Layout is working fine. I want to make one of the subviews bounce using the cool gravity effects provided by UIDynamicAnimator. I didn't think that would work with AutoLayout, but I tried it and it does. It works quite well! My question is , is this the expected behavior? Is it going to cause problems somewhere? Does Apple provide any guidance around combining AutoLayout and

“Launch” and drop a UIView

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问题 Above picture illustrates what I want: The red circle is the starting point of a UIView I want to launch it upwards (Y position) with a change in the X position I want to make it drop within boundaries. What I tried: For the launch I can make use of the UIView.animate function. For the drop I can use the UIDynamicAnimator. However there are some problems: -In the UIView.animate I cannot 'curve' the animation, only a straight line. I can use this answer here to draw a curve line: https:/

Animate UIView horizontally using UIDynamicAnimator

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I have gone through the documentation, and I am embarrassed to say I am confused. The Scenario : I have a UIView , that acts like a container for 3 UIButtons . This container is initially of bounds {0, 0, 35, 35} , with each button inside with the same co-ordinates (with alpha 0). On a specific action by the user, the container changes bounds to {0, 0, 100, 35} , and the button are animated to x-origin 5, 35, and 65, respectively, with alpha 1, such that they are spread out inside the resized container. I refer to this as the expanded state of the container. The same action by the user,

Animate UIView horizontally using UIDynamicAnimator

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问题 I have gone through the documentation, and I am embarrassed to say I am confused. The Scenario : I have a UIView , that acts like a container for 3 UIButtons . This container is initially of bounds {0, 0, 35, 35} , with each button inside with the same co-ordinates (with alpha 0). On a specific action by the user, the container changes bounds to {0, 0, 100, 35} , and the button are animated to x-origin 5, 35, and 65, respectively, with alpha 1, such that they are spread out inside the resized