Question

我是Swift和SpriteKit的新手。很多SpriteKit动作的样本都在Objective C中，我可以在Swift中映射，也不会工作。

如果运行SKAction，并且在SKAction完成后想要做其他事情，我如何在Swift中做到这一点？

    spaceMan.runAction(spaceManDeathAnimation, completion: {
        println("red box has faded out")
    })

任何想法都将不胜感激。

编辑：

for i in 0...29 {
    textures.append(SKTexture(imageNamed: "spaceManDeath_\(i)"))
}
spaceManDeathAnimation = SKAction.repeatActionForever(SKAction.animateWithTextures(textures, timePerFrame: 0.15625))

Answer 1

在这里发现了一个问题：

spaceManDeathAnimation = SKAction.repeatAction(SKAction.animateWithTextures(textures, timePerFrame: 0.15625), count: 1)

此外，正如sangony发布了一个非常好的链接 - 解决了完成块语法

    spaceMan.runAction(spaceManDeathAnimation, completion: {() -> Void in
        println("death")
    })

非常感谢大家为解决方案做出的贡献！

Answer 2

由于您的“死亡”操作永远在运行，因此您的完成代码未被调用，这意味着它永远不会结束。

您可以使用

+ repeatAction:count:

设置完成前将进行多少次重复计数的方法：

spaceManDeathAnimation = SKAction.repeatAction(SKAction.animateWithTextures(textures, timePerFrame: 0.15625), count:5)

Answer 3

在Swift中你可以使用这个扩展名：

extension SKNode
{
    func runAction( action: SKAction!, withKey: String!, optionalCompletion: dispatch_block_t? )
    {
        if let completion = optionalCompletion
        {
            let completionAction = SKAction.runBlock( completion )
            let compositeAction = SKAction.sequence([ action, completionAction ])
            runAction( compositeAction, withKey: withKey )
        }
        else
        {
            runAction( action, withKey: withKey )
        }
    }
}

例如用作：

myShip.runAction(move,withKey:"swipeMove",optionalCompletion: {
  //Here action is ended..do whatever you want
}

Swift 3：

extension SKNode
{
    func run(action: SKAction!, withKey: String!, optionalCompletion:((Void) -> Void)?) {
        if let completion = optionalCompletion
        {
            let completionAction = SKAction.run(completion)
            let compositeAction = SKAction.sequence([ action, completionAction ])
            run(compositeAction, withKey: withKey )
        }
        else
        {
            run( action, withKey: withKey )
        }
    }

    func actionForKeyIsRunning(key: String) -> Bool {
            return self.action(forKey: key) != nil ? true : false
    }
}

<强>用法：

myShip.runAction(action: move, withKey:"swipeMove", optionalCompletion: {
       //Here action is ended..do whatever you want
}

SKAction完井处理程序;在Swift中的用法

3 个答案:

Swift 3：