Swift / Spritekit-如何浏览数组？

Question

我是一个新手，所以这里...我需要帮助来弄清楚如何在SpriteKit游戏中分页浏览一个精灵数组。 如何更改此代码一次仅显示4个项目，并编写一个“移至下一页”的函数？

let myArray:Array<String> = [sprite1, sprite2, sprite3, sprite4, sprite5, sprite6, sprite7, sprite8, sprite9, sprite10, sprite11, sprite12]

for (index, item) in myArray.enumerate() {
    let gofoodsprite = SKSpriteNode(imageNamed:"\(item)")
    gofoodsprite.name = item
    gofoodsprite.position = CGPointMake(gobuttonX, 275)
    gobuttonX = gobuttonX + 105
    self.addChild(gofoodsprite)
}

Answer 1

您将需要一个变量来管理页码，然后相应地更改循环：

var pageNumber = 0

let myArray:Array<String> = [sprite1, sprite2, sprite3, sprite4, sprite5, sprite6, sprite7, sprite8, sprite9, sprite10, sprite11, sprite12]

for var i in 0..<4 {
    let item = myArray[pageNumber*4 + i]
    let gofoodsprite = SKSpriteNode(imageNamed:"\(item)")
    gofoodsprite.name = item
    gofoodsprite.position = CGPointMake(gobuttonX, 275)
    gobuttonX = gobuttonX + 105
    self.addChild(gofoodsprite)
}

然后，您的“下一页”代码将1添加到pageNumber并再次调用循环。