Texture + UIDynamics

[BrandonMA]

I'm trying to use UIDynamics with texture, just moving a node to a tap(UITapGestureRecognizer) and animating with UISnapBehavior, but if you run the code I'm posting you will see that the animation is not executed but it jumps to the final state instead. Probably because layout() is getting called, any idea how to use UIDynamics with Texture?

`import AsyncDisplayKit

class SFExperimentNode: ASDisplayNode {

override func didLoad() {
    super.didLoad()
    automaticallyManagesSubnodes = true
}

lazy var middleNode: ASDisplayNode = {
    let node = ASDisplayNode()
    node.backgroundColor = SFAssets.red
    return node
}()

override func layoutSpecThatFits(_ constrainedSize: ASSizeRange) -> ASLayoutSpec {
    middleNode.style.preferredLayoutSize = ASLayoutSize(width: ASDimension(unit: .points, value: 200), height: ASDimension(unit: .points, value: 200))
    return ASRelativeLayoutSpec(horizontalPosition: .center, verticalPosition: .center, sizingOption: .minimumSize, child: middleNode)
}

}

class SFExperimentController: ASViewController {

var animator: UIDynamicAnimator!
var snap: UISnapBehavior!

override func viewDidAppear(_ animated: Bool) {
    super.viewDidAppear(animated)
    createGestureRecognizer()
    animator = UIDynamicAnimator(referenceView: self.node.view)
}

func createGestureRecognizer() {
    let panGestureRecognizer: UITapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(handlePan(sender:)))
    self.node.view.addGestureRecognizer(panGestureRecognizer)
}

@objc func handlePan(sender: UITapGestureRecognizer) {
    let touchPoint = sender.location(in: self.node.view)

    if snap != nil {
        animator.removeAllBehaviors()
    }

    snap = UISnapBehavior(item: self.node.middleNode.view, snapTo: touchPoint)
    animator.addBehavior(snap)
}

}`

[muukii]

animator.addBehavior causes layoutSublayers in CALayer. Then Texture lays out subnodes again according to the calculated layout. That's why dragged box would back to its original position. To prevent, overriding frame property and skipping setting frame while animating.

[muukii]