swift - 如何使用 SKAction 改变 SKSpriteNode 的位置

Question

while word != ""{

    if word[word.startIndex] == "R" {

        let moveSpriteToRight = SKAction.move(to: CGPoint(x: sprite.position.x+128, y: sprite.position.y), duration: 1)

        sprite.run(moveSpriteToRight)

    } else if word == "D" {

        let moveSpriteToDown = SKAction.move(to: CGPoint(x: sprite.position.x, y: sprite.position.y-128), duration: 1)

        sprite.run(moveSpriteToDown)

    } else if word == "L" {

        let moveSpriteToLeft = SKAction.move(to: CGPoint(x: sprite.position.x-128, y: sprite.position.y), duration: 1)

        sprite.run(moveSpriteToLeft)

    } else if word == "U" {

        let moveSpriteToUp = SKAction.move(to: CGPoint(x: sprite.position.x, y: sprite.position.y+128), duration: 1)

        sprite.run(moveSpriteToUp) 
    }

    word.remove(at: word.startIndex)
}

这是我代码的一部分。我不能多次使用 SKAction。例如，如果单词 = "ULD"，那么 Sprite 应该沿着向上 (U)、然后向左 (L) 和向下 (D) 的路径移动。每次用户通过手势创建新的轨迹时，记录手势的终止都会通过 touchesEnded 发生。雪碧他们必须每次执行。但是我在模拟器中的 Sprite 在这个例子和所有的例子中改变了位置。

Answer 1

您可以将您的操作放入一个数组中，并在完成所有检查后按顺序运行它们

let actions = [SKAction]()

while word != ""{

    if word[word.startIndex] == "R" {
        actions.append(SKAction.move(to: CGPoint(x: sprite.position.x+128, y: sprite.position.y), duration: 1))
    }

    if word == "D" {
        actions.append(SKAction.move(to: CGPoint(x: sprite.position.x, y: sprite.position.y-128), duration: 1))
    } 

    if word == "L" {
        actions.append(SKAction.move(to: CGPoint(x: sprite.position.x-128, y: sprite.position.y), duration: 1))
    } 

    if word == "U" {
        actions.append(SKAction.move(to: CGPoint(x: sprite.position.x, y: sprite.position.y+128), duration: 1))
    }

    word.remove(at: word.startIndex)
}

let sequenceOfActions = SKAction.sequence([actions])
sprite.run(sequenceOfActions)