我有SKScene个节点（SKSpriteNode s，SKShapeNode s等），我希望能够单独平移 和同时。我需要能够：
例如，如果我可以为每个节点添加UIPanGestureRecognizer，这将很容易。但是，据我所知，UIGestureRecognizer的唯一选择是将其添加到view的{{1}}。我用一个识别器实现了这一点，并且在我SKScene上识别器的相关操作中的所有触摸和节点的操作都有点痛苦。这是我为识别器所做的事情：
SKScene基本上，我只是在手势识别器的class MultiplePanGestureRecognizer: UIGestureRecognizer {
var currentTouches: Array<UITouch> = []
override func touchesBegan(touches: NSSet!, withEvent event: UIEvent!) {
super.touchesBegan(touches, withEvent: event)
for touch in touches {
currentTouches.append(touch as UITouch)
}
state = .Began
}
override func touchesMoved(touches: NSSet!, withEvent event: UIEvent!) {
super.touchesMoved(touches, withEvent: event)
state = .Changed
}
override func touchesEnded(touches: NSSet!, withEvent event: UIEvent!) {
super.touchesEnded(touches, withEvent: event)
removeCancelledOrEndedTouches(touches)
}
override func touchesCancelled(touches: NSSet!, withEvent event: UIEvent!) {
super.touchesCancelled(touches, withEvent: event)
removeCancelledOrEndedTouches(touches)
}
// Add new touches to currentTouches
func addUntrackedTouchesFromSet(touches: NSSet!) {
for touch in touches {
let index = find(currentTouches, touch as UITouch)
if index == nil {
currentTouches.append(touch as UITouch)
}
}
}
// Remove received touches from currentTouches array
func removeCancelledOrEndedTouches(touches: NSSet!) {
for touch in touches {
if let index = find(currentTouches, touch as UITouch) {
currentTouches.removeAtIndex(index)
}
}
// End the gesture if there are no touches remaining in currentTouches
if currentTouches.count == 0 {
state = .Ended
}
}
override func reset() {
super.reset()
currentTouches = []
}
}
属性上保留所有触摸功能，以便我可以在附加的操作中访问所有它们。这意味着我必须在currentTouches中兼顾触及命中节点等的内容。最初，我尝试通过在手势识别器SKScene中将其状态设置为.Began来重新启动手势。但是，手动将识别器的状态重置为touchesBegan:withEvent:并未触发操作，因此我不得不让新触摸在我的识别器中触发.Began状态，然后处理所有事情回到行动中。
作为参考，我的.Changed中的方法是作为识别器操作添加的：
SKScene（func handleMultiplePan(recognizer: MultiplePanGestureRecognizer) {
switch recognizer.state {
case .Began, .Changed:
// Remove those touches from tracking that are no longer being
// recognized
touchNodeMap.prune(recognizer.currentTouches)
// Iterate over the recognizer's currentTouches
for touch in recognizer.currentTouches {
// Is it over a child node of the scene?
if let node = getChildNodeForTouch(touch) {
// If so, add it to the touchNodeMap
touchNodeMap.add(touch, withNode: node)
}
}
// Iterate over currentlyPanningTouches and move nodes accordingly
for (touch, node) in touchNodeMap {
let location = touch.locationInNode(self)
let previousLocation = touch.previousLocationInNode(self)
let deltaX = location.x - previousLocation.x
let deltaY = location.y - previousLocation.y
node.position = CGPointMake(node.position.x + deltaX, node.position.y + deltaY)
}
// Get node for most recent touch
let (_, mostRecentNode) = touchNodeMap.mostRecentTouchAndNode()
// Remove and re-add it to the scene
if mostRecentNode != nil {
mostRecentNode!.removeFromParent()
addChild(mostRecentNode!)
}
default:
break
}
}
只是将touchNodeMap es映射到Dictionary的{{1}}。）
我的问题是，我在这里遗失了什么吗？有没有办法在每个节点上使用UITouch？或者，有没有更好的方法来做我想做的事情？
答案 0 :(得分：0)
我遇到了同样的挑战，得到了@vacawama的非常好的帮助。请参阅此链接：How to implement multiple PanGestures (Draggable views)?
我这是你在寻找什么？