ios - Swift Sprite 套件 : How do you set an animation for a random time?

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 秒到 3 秒之间的随机时间)。然后，如果在红灯亮起时触摸屏幕，我希望出现一个游戏结束标志。提前谢谢你。

Answer 1

你需要用到的是SKAction.waitForDuration(_:withRange:)

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

或者更具体地说:

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，我冒昧地将您的“var”变量更改为“let”常量，因为它们没有被更改。