所以我目前正在开发一个用Swift3编写的2D无限运行器，并为我的节点和场景使用Spritekit。我最近实现了一些代码来检测一般的滑动，它们将在下面。所以我的问题是：如何检测滑动操作并检查Spritekit节点上的滑动方向？我意识到之前已经问过这个问题，但我找不到一个可行的解决方案，因为我遇到的一切似乎都是针对Swift和Swift2而不是Swift3。
这是我的滑动检测代码：
override func viewDidLoad() {
super.viewDidLoad()
let swipeLeft = UISwipeGestureRecognizer(target: self, action: #selector(self.respondToSwipeGesture))
swipeLeft.direction = UISwipeGestureRecognizerDirection.left
self.view.addGestureRecognizer(swipeLeft)
let swipeRight = UISwipeGestureRecognizer(target: self, action: #selector(self.respondToSwipeGesture))
swipeRight.direction = UISwipeGestureRecognizerDirection.right
self.view.addGestureRecognizer(swipeRight)
let swipeUp = UISwipeGestureRecognizer(target: self, action: #selector(self.respondToSwipeGesture))
swipeUp.direction = UISwipeGestureRecognizerDirection.up
self.view.addGestureRecognizer(swipeUp)
let swipeDown = UISwipeGestureRecognizer(target: self, action: #selector(self.respondToSwipeGesture))
swipeDown.direction = UISwipeGestureRecognizerDirection.down
self.view.addGestureRecognizer(swipeDown)
}
我用功能测试了这些：
func respondToSwipeGesture(gesture: UIGestureRecognizer) {
if let swipeGesture = gesture as? UISwipeGestureRecognizer {
switch swipeGesture.direction {
case UISwipeGestureRecognizerDirection.right:
print("Swiped right")
case UISwipeGestureRecognizerDirection.down:
print("Swiped down")
case UISwipeGestureRecognizerDirection.left:
print("Swiped left")
case UISwipeGestureRecognizerDirection.up:
print("Swiped up")
default:
break
}
}
}
滑动似乎可以正常工作，因为打印语句已经显示正确的输出以响应我的滑动。
我还添加了一个委托以避免可能的SIGABRT错误：
class GameViewController: UIViewController, UIGestureRecognizerDelegate
如果您想了解更多信息，请与我们联系！
编辑： 添加了我初始化拼图的代码
//The class
class ChoosePiecesClass: SKSpriteNode{
func moveWithCamera() {
self.position.x += 5;
}
//initialize a piece
private var RandomPiece1: ChoosePiecesClass?;
override func didMove(to view: SKView) {
RandomPiece1 = childNode(withName: "RandomPiece1") as? ChoosePiecesClass;
RandomPiece1?.position.x = 195;
RandomPiece1?.position.y = -251;
}
override func update(_ currentTime: TimeInterval) {
RandomPiece1?.moveWithCamera();
}
在单击“开始游戏”并触发fatalError代码时，编辑从控制台提供错误语句，导致游戏崩溃。
fatal error: init(coder:) has not been implemented: file /Users/ardemis/Documents/PuzzleRunner/PuzzleRunner 3 V3/PuzzleRunner/ChoosePieces.swift, line 33
它还会显示以下内容
EXEC_BAT_INSTRUCTION(code = EXEC_1386_INVOP, subcode = 0x0)
与fatalError声明在同一行。
答案 0 :(得分：4)
如果我试图跟踪特定的SpriteNodes，我不会使用UIGestures。您可以轻松跟踪TouchesBegan中的节点，并找出滑动方向发生的方向。此示例在屏幕上有三个精灵将打印/记录其中一个被刷过的方向，并将忽略所有其他滑动。
编辑＆gt;我刚刚为我的Box对象创建了一个子类（抱歉，我没有使用你的命名，但它具有相同的功能）。可能有很多方法可以做到这一点，我选择在子类上使用创建协议并使场景符合协议。我将所有触摸/滑动功能移动到子类中，当它完成检测滑动时，它只调用委托并说明哪个对象已被刷过。
protocol BoxDelegate: NSObjectProtocol {
func boxSwiped(box: Box)
}
class Box: SKSpriteNode {
weak var boxDelegate: BoxDelegate!
private var moveAmtX: CGFloat = 0
private var moveAmtY: CGFloat = 0
private let minimum_detect_distance: CGFloat = 100
private var initialPosition: CGPoint = CGPoint.zero
private var initialTouch: CGPoint = CGPoint.zero
private var resettingSlider = false
override init(texture: SKTexture?, color: UIColor, size: CGSize) {
super.init(texture: texture, color: color, size: size)
self.isUserInteractionEnabled = true
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
func moveWithCamera() {
self.position.x += 5
}
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
if let touch = touches.first as UITouch! {
initialTouch = touch.location(in: self.scene!.view)
moveAmtY = 0
moveAmtX = 0
initialPosition = self.position
}
}
override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
if let touch = touches.first as UITouch! {
let movingPoint: CGPoint = touch.location(in: self.scene!.view)
moveAmtX = movingPoint.x - initialTouch.x
moveAmtY = movingPoint.y - initialTouch.y
}
}
override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
var direction = ""
if fabs(moveAmtX) > minimum_detect_distance {
//must be moving side to side
if moveAmtX < 0 {
direction = "left"
}
else {
direction = "right"
}
}
else if fabs(moveAmtY) > minimum_detect_distance {
//must be moving up and down
if moveAmtY < 0 {
direction = "up"
}
else {
direction = "down"
}
}
print("object \(self.name!) swiped " + direction)
self.boxDelegate.boxSwiped(box: self)
}
}
在GameScene.sks中
确保通过在声明后添加协议使GameScene符合BoxDelegate
class GameScene: SKScene, BoxDelegate {
var box = Box()
var box2 = Box()
var box3 = Box()
override func didMove(to view: SKView) {
box = Box(color: .white, size: CGSize(width: 200, height: 200))
box.zPosition = 1
box.position = CGPoint(x: 0 - 900, y: 0)
box.name = "white box"
box.boxDelegate = self
addChild(box)
box2 = Box(color: .blue, size: CGSize(width: 200, height: 200))
box2.zPosition = 1
box2.name = "blue box"
box2.position = CGPoint(x: 0 - 600, y: 0)
box2.boxDelegate = self
addChild(box2)
box3 = Box(color: .red, size: CGSize(width: 200, height: 200))
box3.zPosition = 1
box3.name = "red box"
box3.position = CGPoint(x: -300, y: 0)
box3.boxDelegate = self
addChild(box3)
}
func boxSwiped(box: Box) {
currentObject = box
print("currentObject \(currentObject)")
}
override func update(_ currentTime: TimeInterval) {
box.moveWithCamera()
box2.moveWithCamera()
box3.moveWithCamera()
}
}