如何使用滑动手势移动精灵？

Question

How can i move a sprite to the left by swiping to the left, move a sprite to the right by swiping to the right and so on?

Like if I swipe to the left, my sprite moves 20 points to the left..I am using SpriteKit and Swift.

Answer 1

Thank You! @jonogilmour

I have resolved it in this way:

let right = SKAction.moveByX(64, y: 0, duration: 0.6)
    let left = SKAction.moveByX(-64, y: 0, duration: 0.6)
    let up = SKAction.moveByX(0, y: 64, duration: 0.6)
    let down = SKAction.moveByX(0, y: -64, duration: 0.6)



    func swipedRight(sender:UISwipeGestureRecognizer){
        player.runAction(right)
    }
    func swipedLeft(sender:UISwipeGestureRecognizer){
        player.runAction(left)
    }
    func swipedUp(sender:UISwipeGestureRecognizer){
        player.runAction(up)
    }
    func swipedDown(sender:UISwipeGestureRecognizer){
        player.runAction(down)
    }


override func didMoveToView(view: SKView) {


        let swipeRight:UISwipeGestureRecognizer = UISwipeGestureRecognizer(target: self, action: Selector("swipedRight:"))
    swipeRight.direction = .Right
    view.addGestureRecognizer(swipeRight)

    let swipeLeft:UISwipeGestureRecognizer = UISwipeGestureRecognizer(target: self, action: Selector("swipedLeft:"))
    swipeLeft.direction = .Left
    view.addGestureRecognizer(swipeLeft)

    let swipeUp:UISwipeGestureRecognizer = UISwipeGestureRecognizer(target: self, action: Selector("swipedUp:"))
    swipeUp.direction = .Up
    view.addGestureRecognizer(swipeUp)

    let swipeDown:UISwipeGestureRecognizer = UISwipeGestureRecognizer(target: self, action: Selector("swipedDown:"))
    swipeDown.direction = .Down
    view.addGestureRecognizer(swipeDown)
............

Answer 2

For swipes, you can use UIGestureRecognizer , specifically UISwipeGestureRecognizer . These are well documented so a simple Google search will give you what you need. Then, you will need to use either applyForce() or applyImpulse() on your sprite. Again, these are well documented and trivial to implement.

The difference between the two is that an impulse is like hitting a ball with a bat; the impulse is applied once to the object and tapers off over time. A force is applied constantly over time, like a car accelerating. In this case you could apply an impulse on the swipe and be done with it, or you could apply a force and continue applying it whilst x_distance < 20 in your update() method.