SpriteKit(5) - 交互(Scene手势)

常用的手势识别器

let tap : UITapGestureRecognizer                 //轻拍
let pin : UIPinchGestureRecognizer               //捏
let swipe : UISwipeGestureRecognizer             //滑动
let rotate : UIRotationGestureRecognizer         //旋转
let pan : UIPanGestureRecognizer                 //移动
let longpress : UILongPressGestureRecognizer     //长按

轻拍

let tap : UITapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(GameGesture.tap))
self.view?.addGestureRecognizer(tap)

捏

let pin : UIPinchGestureRecognizer = UIPinchGestureRecognizer(target: self, action: #selector(GameGesture.pin(recognizer:)))
self.view?.addGestureRecognizer(pin)

滑动

//默认是右滑
let swpieRight : UISwipeGestureRecognizer = UISwipeGestureRecognizer(target: self, action: #selector(GameGesture.swipe(recognizer:)))
let swpieLeft : UISwipeGestureRecognizer = UISwipeGestureRecognizer(target: self, action: #selector(GameGesture.swipe(recognizer:)))
let swpieUp : UISwipeGestureRecognizer = UISwipeGestureRecognizer(target: self, action: #selector(GameGesture.swipe(recognizer:)))
let swpieDown : UISwipeGestureRecognizer = UISwipeGestureRecognizer(target: self, action: #selector(GameGesture.swipe(recognizer:)))

swpieRight.direction = .right
swpieLeft.direction = .left
swpieUp.direction = .up
swpieDown.direction = .down

self.view?.addGestureRecognizer(swpieRight)
self.view?.addGestureRecognizer(swpieLeft)
self.view?.addGestureRecognizer(swpieUp)
self.view?.addGestureRecognizer(swpieDown)

旋转

let rotate : UIRotationGestureRecognizer = UIRotationGestureRecognizer(target: self, action: #selector(GameGesture.rotate(recognizer:)))
self.view?.addGestureRecognizer(rotate)

移动

let pan : UIPanGestureRecognizer = UIPanGestureRecognizer(target: self, action: #selector(GameGesture.pan(recognizer:)))
self.view?.addGestureRecognizer(pan)

长按

let longPress : UILongPressGestureRecognizer = UILongPressGestureRecognizer(target: self, action: #selector(GameGesture.longpress(recognizer:)))
self.view?.addGestureRecognizer(longPress)

初始化

override func didMove(to view: SKView) {
        self.size = UIScreen.main.bounds.size
        node = SKSpriteNode()
        node.name = "gesture"
        node.color = UIColor.red
        node.size = CGSize(width: 100, height: 100)
        node.position = CGPoint(x: self.frame.midX, y: self.frame.midY)
        self.addChild(node)

        //添加手势
        ....
}

事件方法

    @objc func tap()  {
        node.isHidden = !node.isHidden
    }
    
    var lastScale : CGFloat = 0.0
    @objc func pin(recognizer : UIPinchGestureRecognizer)  {
        self.view?.bringSubview(toFront: view!)
        if recognizer.state == UIGestureRecognizerState.ended {
            lastScale = 1.0 //放手之后比例设置为1:1
            return
        }
        //上一次的缩放比例 - 当前捏缩放比例 = 下一次比例的变化值.
        let scale : CGFloat = 1.0 - (lastScale - recognizer.scale)
        recognizer.view?.transform = recognizer.view!.transform.scaledBy(x: scale, y: scale)
        lastScale = recognizer.scale
    }
    
    @objc func rotate(recognizer : UIRotationGestureRecognizer)  {
        self.node.zRotation = -recognizer.rotation
    }
    
    @objc func pan(recognizer : UIPanGestureRecognizer)  {
        if recognizer.state == UIGestureRecognizerState.changed {
            let point = recognizer.location(in: self.view!)
            self.node.position = CGPoint(x: point.x, y: point.y)
            //这里考虑recognizer 和 node 的坐标系Y轴是相反的.
            //所以,这里有一个bug,就是平移的时候,Y轴的走向是相反的.这个bug待解决.
        }
    }
    
    @objc func swipe(recognizer : UISwipeGestureRecognizer)  {
        switch recognizer.direction {
        case .left:
            self.node.run(SKAction.moveBy(x: -100, y: 0, duration: 1))
            break
        case .right:
            self.node.run(SKAction.moveBy(x: 100, y: 0, duration: 1))
            break
        case .up:
            self.node.run(SKAction.moveBy(x: 0, y: 100, duration: 1))
            break
        case .down:
            self.node.run(SKAction.moveBy(x: 0, y: -100, duration: 1))
            break
        default:break;
        }
    }
    
    @objc func longpress(recognizer : UIRotationGestureRecognizer)  {
        self.node.color = UIColor.green
    }