使玩家在Sprite Kit Swift中进行双重跳跃

Question

使玩家在Sprite Kit Swift中进行双重跳跃

3

我已经为我的玩家实现了单次跳跃。但是，如果用户点击两次，我希望玩家能够进行双重跳跃。

如何使下面的函数检查跳跃是否仍在持续中，以便他们可以再次点击并跳跃？

override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {

    var isJumping = false
    var isDoubleJumping = false

    if mario.action(forKey: "jump") == nil && isJumping {

        let marioTextureJump = SKTexture(imageNamed: "mariojump.png")

        let animation = SKAction.animate(with: [marioTextureJump], timePerFrame: 0.6)

        mario.run(animation)

        mario.run(jumpAction, withKey: "jump")

        if isJumping {

            isDoubleJumping = true
            isJumping = false
        }

        else {

            isJumping = true
            isDoubleJumping = false
        }
    }
}

- Jack Richards

1个回答

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- Ron Myschuk · Accepted Answer

最简单的方法可能是在你的场景中添加2个标记。

isPlayerJumping = false
isPlayerDoubleJumping = false

然后在你的touches函数中检查并设置这些变量。

override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent {

    //if the player is already double jumping don't let them jump again until finished
    guard !isDoubleJumping else { return }

    let animation = SKAction.animate(with: [playerTextureJump], timePerFrame: 0.6)

    player.run(animation)

    if isJumping {
        isDoubleJumping = true
        isJumping = false

        player.run(jumpAction, withKey: "jump") {
            self.isDoubleJumping = false
        }
    }
    else {
        isJumping = true

        player.run(jumpAction, withKey: "jump") {
            self.isJumping = false
        }
    }
}

如果您不想使用守卫，可以在此处放置一个if语句。

if isPlayerDoubleJumping {
    return
}

在你的jumpAction结束时，你需要运行一段代码块来重置变量。

SKAction.run {
    isJumping = false
    isDoubleJumping = false
}

你甚至可以在触摸开始时内联更改变量，像这样...

player.run(jumpAction, withKey: "jump") {
    self.isPlayerJumping = false
    self.isPlayerDoubleJumping = false
}