如何在SpriteKit中停止英雄（角色）运动？

Question

在 Player.Swift 里面走Hero这个功能的主要功能我想停止在触摸位置行走。

此功能将在 GameScene.swift

内继续运行

我希望当用户点击目标位置时停止我的英雄，但是当用户点击新目标位置时英雄停止英雄移动新位置并再次停止。

这是我的代码：

    { 
     override init() {

    let atlas = SKTextureAtlas(named: "characters")
    let texture = atlas.textureNamed("player_ft1")
    texture.filteringMode = .Nearest

    sprite = AnimatedSprite(texture: texture)

   // sprite = SKSpriteNode(texture: texture)

    super.init()

    addChild(sprite)
    name = "player"

    // 1
    var minDiam = min(sprite.size.width, sprite.size.height)
    minDiam = max(minDiam-16.0, 4.0)
    let physicsBody = SKPhysicsBody(circleOfRadius: minDiam/2.0)

    // 2
    physicsBody.usesPreciseCollisionDetection = true
    // 3
    physicsBody.allowsRotation = false
    physicsBody.restitution = 1
    physicsBody.friction = 0
    physicsBody.linearDamping = 0
    physicsBody.collisionBitMask = PhysicsCategory.Boundary
    physicsBody.collisionBitMask = PhysicsCategory.Boundary | PhysicsCategory.Wall | PhysicsCategory.Water
    //physicsBody.dynamic=false

    // 4
    self.physicsBody = physicsBody

    sprite.facingBackAnim = AnimatedSprite.createAnimWithPrifix("player",suffix: "ft")
    sprite.facingForwardAnim = AnimatedSprite.createAnimWithPrifix("player",suffix: "bk")
    sprite.facingSideAnim = AnimatedSprite.createAnimWithPrifix("player",suffix: "lt")
    sprite.runAction(sprite.facingBackAnim)
}
func moveToward(target: CGPoint) {
   // _Lastlocation
    let targetVector = (target - position).normalized() * 150.0
        physicsBody?.velocity = CGVector(point: targetVector)
    faceCurrentDirection()
 }