ios - 仅当玩家在 Y 轴上向上时移动地面视差

Question

从本质上讲，我正在制作一款跳台游戏。当玩家与平台碰撞时，玩家会在 y 轴上受到向上的冲击。我得到的下面的代码模拟了跟随玩家的 View 。当玩家在 y 轴上向下时，它也会跟随玩家。我不想要那个。只希望玩家向上时中景、前景和背景向下移动。

Gamescene.swift:

class GameScene: SKScene, SKPhysicsContactDelegate {

var background:SKNode!
var midground:SKNode!
var foreground:SKNode!




required init?(coder aDecoder: NSCoder) {
    super.init(coder: aDecoder)

}

override init(size: CGSize){
    super.init(size: size)

    background = createBackground()
    addChild(background)

    midground = createMidground()
    addChild(midground)

    foreground = SKNode()
    addChild(foreground)

    player = createPlayer()
    foreground.addChild(player)

}

override func update(currentTime: CFTimeInterval) {

    if player.position.y > 200{
        background.position = CGPoint(x: 0, y: -((player.position.y - 200)/10))
        midground.position = CGPoint(x: 0, y: -((player.position.y - 200)/4))
        foreground.position = CGPoint(x: 0, y: -((player.position.y) - 200))
    }

Answer 1

您可以查看玩家位置。

    var PlayerPosition1 = 0

override func update(currentTime: CFTimeInterval) {

    if player.position.y > 200{
        if player.position.y > PlayerPosition1{
            background.position = CGPoint(x: 0, y: -((player.position.y - 200)/10))
            midground.position = CGPoint(x: 0, y: -((player.position.y - 200)/4))
            foreground.position = CGPoint(x: 0, y: -((player.position.y) - 200))
        }
    }

    PlayerPosition1 = player.position.y
}

类似的东西应该可以工作..

编辑: 啊好吧..这不是真正的“滞后”..触摸平台时背景只是移回“旧”位置..试试这个:

var PlayerMaxY = CGFloat()

    if player.position.y > 200 {
        if player.position.y > PlayerMaxY{
            PlayerMaxY = player.position.y
            background.position = CGPoint(x: 0, y: -((player.position.y - 200)/10))
            midground.position = CGPoint(x: 0, y: -((player.position.y - 200)/4))
            forefround.position = CGPoint(x: 0, y: -((player.position.y - 200)))
        }
    }