[英]UICollisionBehavior Ignore Screen Edges
我有幾個 UIViews 在屏幕上不斷移動。 使用UICollisionBehavior
我可以防止視圖相互碰撞,但我需要它們穿過屏幕的邊緣(頂部、左側、右側、底部)。 在下面的這個例子中,一旦它們碰到屏幕的底部邊緣,它們就會相互彈開,然后最終就坐在那里。 我試圖對 UIViews 進行子類化,並查看沖突是否僅適用於子類類型,但這不起作用。
如何防止 UIView 相互碰撞,但仍讓它們穿過屏幕邊緣?
子類:
class CollisionView: UIView { // nothing special happens here except it's a subclass
}
代碼:
lazy var redView: CollisionView = {
let view = CollisionView()
view.backgroundColor = .red
return view
}()
lazy var blueView: CollisionView = {
let view = CollisionView()
view.backgroundColor = .blue
return view
}()
lazy var yellowView: CollisionView = {
let view = CollisionView()
view.backgroundColor = .yellow
return view
}()
lazy var purpleView: CollisionView = {
let view = CollisionView()
view.backgroundColor = .purple
return view
}()
lazy var greenView: CollisionView = {
let view = CollisionView()
view.backgroundColor = .green
return view
}()
var arr = [CollisionView]()
var animator: UIDynamicAnimator!
var gravity: UIGravityBehavior!
var collider: UICollisionBehavior!
var bouncingBehavior : UIDynamicItemBehavior!
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = .white
addSubViews()
addAnimatorAndBehaviors()
}
func addAnimatorAndBehaviors() {
animator = UIDynamicAnimator(referenceView: self.view)
gravity = UIGravityBehavior(items: arr)
animator.addBehavior(gravity)
collider = UICollisionBehavior(items: arr)
collider.translatesReferenceBoundsIntoBoundary = true
animator.addBehavior(collider)
bouncingBehavior = UIDynamicItemBehavior(items: arr)
bouncingBehavior.elasticity = 0.75
animator.addBehavior(bouncingBehavior)
}
func addSubViews() {
let size = CGSize(width: 50, height: 50)
redView.frame = CGRect(origin: view.center, size: size)
blueView.frame = CGRect(origin: view.center, size: size)
yellowView.frame = CGRect(origin: view.center, size: size)
purpleView.frame = CGRect(origin: view.center, size: size)
greenView.frame = CGRect(origin: view.center, size: size)
view.addSubview(redView)
view.addSubview(blueView)
view.addSubview(yellowView)
view.addSubview(purpleView)
view.addSubview(greenView)
arr = [redView, blueView, yellowView, purpleView, greenView]
}
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