Question

我的swift项目中有以下Sprite Kit场景。它会在屏幕上移动SKNode。问题是我希望圆圈向上和向下移动，但它只向下或向下移动。我检查了yMove的值，以确认它是在y轴上随机产生正变化。它正在生成这些正值，但对象仍然只能水平和垂直移动。

class GameScene: SKScene {


override func didMoveToView(view: SKView) {
    backgroundColor = SKColor.whiteColor()

    runAction(SKAction.repeatActionForever(
        SKAction.sequence([
            SKAction.runBlock(addKugel),
            SKAction.waitForDuration(1.0)
            ])
        ))


}

func addKugel() {

    // Create sprite
    let kugel = SKShapeNode(circleOfRadius: 100 )
    kugel.strokeColor = SKColor.blackColor()
    kugel.glowWidth = 1.0

    // Determine where to spawn the monster along the Y axis
    let actualY = random(min: 200/2, max: size.height - 200/2)

    // Position the monster slightly off-screen along the right edge,
    // and along a random position along the Y axis as calculated above
    kugel.position = CGPoint(x: size.width + 200/2, y: actualY)

    // Add the monster to the scene
    addChild(kugel)

    // Determine speed of the monster
    let actualDuration = random(min: CGFloat(2.0), max: CGFloat(4.0))

    //randomly create coefficients for movement
    let xVector = random(min: CGFloat(0.0), max: CGFloat(1.0))
    var yVector = random(min: CGFloat(0.0), max: CGFloat(1.0))

    //overly complicated way to make a number negative 50 percent of the time
    var probNegative = random(min: CGFloat(0.0), max: CGFloat(1.0))
    if (probNegative > 0.5){
        yVector = 0.0 - yVector
    }
    debugPrint(yVector)
    // Create the actions
    let yMove = (200/2)*yVector
    debugPrint(yMove)
    let actionMove = SKAction.moveTo(CGPoint(x: -200/2*xVector, y: yMove), duration: NSTimeInterval(actualDuration))
    let actionMoveDone = SKAction.removeFromParent()
    kugel.runAction(SKAction.sequence([actionMove, actionMoveDone]))

}
}

Answer 1

所以我对Split()正在做的事情非常怀疑。所有int[]都会将精灵移动到特定的var result = Array.ConvertAll(str.Split(','), int.Parse);。我按照精灵大小缩放y坐标，而不是随机选择moveTo和moveTo之间的值。以下是上述代码段的简化版本：

CGPoint

让sprite kit对象向上移动

1 个答案: