Swift Sprite-kit：如何随机设置动画？

Question

    var lightTexture = SKTexture(imageNamed: "green light.png")
    var lightTexture2 = SKTexture(imageNamed: "red light.png")

    var animationLight = SKAction.animateWithTextures([lightTexture, lightTexture2], timePerFrame:     3)
    var changeLight = SKAction.repeatActionForever(animationLight)

    light = SKSpriteNode(texture: lightTexture)
    light.position = CGPointMake(CGRectGetMidX(self.frame), 650)
    light.runAction(changeLight)

    self.addChild(light)

我想将动画设置为随机时间间隔（1秒至3秒之间的随机时间）。 然后，如果在红灯亮时触摸了屏幕，我希望出现游戏结束标志。 先感谢您。

Answer 1

您需要使用的是SKAction.waitForDuration（_：withRange :)

https://developer.apple.com/library/prerelease/ios/documentation/SpriteKit/Reference/SKAction_Ref/index.html#//apple_ref/occ/clm/SKAction/waitForDuration:withRange ：

或更具体地说：

let lightTexture = SKTexture(imageNamed: "green light.png")
let lightTexture2 = SKTexture(imageNamed: "red light.png")

let animateLights = SKAction.sequence([
    SKAction.waitForDuration(2.0, withRange: 2.0),
    SKAction.animateWithTextures([lightTexture, lightTexture2], timePerFrame: 3)
    ])

let changeLight = SKAction.repeatActionForever(animateLights)

let light = SKSpriteNode(texture: lightTexture)
light.position = CGPointMake(400, 650)
light.runAction(changeLight)

self.addChild(light)

根据文档，您的动画将持续2秒+/- 1秒。

另请注意，我可以自由地将您的“ var”变量更改为“ let”常量，因为它们没有被更改。