Question

我在创建SKShapeNode时遇到了swift的问题，好像我的＆＃39; y＆＃39;坐标是倒置的。

最初我将我的节点放在屏幕的底部并添加了一个物理体（由于我已经将skView.showsPhysics设置为true并验证了这一点，因此正确放置）但每当我尝试与使用UIPanGestureRecognizer的节点除非我与屏幕的上方相对，否则它不会移动。我发现无论节点在哪里都会有反应，但我必须反转输入的Y位置。

此外，如果我在倒置位置向下拖动，节点将向下移动，因此在某种意义上它不会完全反转，因为它仍然会以正确的方向相互作用。

此时我认为它与不同的坐标系有关，但是我无法隔离我的代码的哪一部分导致问题。我在下面提供了我的代码。

override func didMoveToView(view: SKView){

let gestureRecognizer = UIPanGestureRecognizer(target: self, action: Selector("handlePan:"))
self.view?.addGestureRecognizer(gestureRecognizer)

physicsWorld.gravity = CGVector(dx: 0.0, dy: -2.0)
physicsWorld.contactDelegate = self

let userShape = SKShapeNode(rectOfSize: CGSize(width: 30, height: 30))
userShape.position = CGPointMake(self.frame.size.width/2, userShape.frame.size.height/2)
userShape.name = "userShape"
userShape.fillColor = SKColor.blueColor()


userShape.physicsBody = SKPhysicsBody(rectangleOfSize: CGSize(width: 30, height: 30))

userShape.physicsBody?.dynamic = true
userShape.physicsBody?.affectedByGravity = false
userShape.physicsBody?.mass = 0.02
userShape.physicsBody?.friction = 0.0
userShape.physicsBody?.restitution = 0.5

addChild(userShape)
}

我的经纪人

func handlePan(recognizer: UIPanGestureRecognizer!)
{

switch recognizer.state{
case .Began:
    var touchLocation = recognizer.locationInView(recognizer.view!)
    selectNodeForTouch(touchLocation)
case .Changed:
    var translation = recognizer.translationInView(recognizer.view!)
    translation = CGPointMake(translation.x, translation.y)
    self.panForTranslation(translation)
    recognizer.setTranslation(CGPointZero, inView: recognizer.view!)
case .Ended:
    var velocity = recognizer.velocityInView(recognizer.view)
    _selectedNode.physicsBody!.applyImpulse(CGVectorMake(velocity.x * velocityController, velocity.y * velocityController * -1.0))
default:
    break;

}

}
func panForTranslation(translation: CGPoint)
{
    var position = _selectedNode.position
    print(_selectedNode.position)
    _selectedNode.position = CGPointMake(position.x + translation.x, position.y - translation.y)
}
func selectNodeForTouch(touchLocation: CGPoint)//NODE SELECTOR
{
    var touchedNode = nodeAtPoint(touchLocation)
    _selectedNode = touchedNode

}

Answer 1

我发现它确实与坐标系的某种对话有关。在.begin语句中的handlePan中，我在创建touchLocation变量后直接放置了这一行 “touchLocation = self.convertPointFromView（touchLocation）”，它似乎解决了这个问题。

使用UIPanGestureRecognizer时，SKShapeNode坐标似乎相反

1 个答案: