小编Lyr*_*res的帖子

试图让精灵'PlayButton'的比例继续向上和向下扩展以暗示用户触摸它.似乎无法让它工作.

这是菜单类:

import SpriteKit

class MenuScene: SKScene {

let ScalePBup = SKAction.scaleX(to: 300, y: 300, duration: 10)
let ScalePBdown = SKAction.scaleX(to: -300, y: -300, duration: 10)

//MARK: - Private Instance Variables
private let logo = GameLogo()
private let title = GameTitle()
private let playButton = PlayButton()
private let background = Background()
private let foreground = Foreground()
private let background2 = Background2()

//MARK: - Init
required init ?(coder aDecoder: NSCoder){
    super.init(coder:aDecoder)
}
override init(size: CGSize){
    super.init(size: size)
}
override func didMove(to …

不知道为什么我在这里收到错误。我按照说明在文档中创建了文件夹“共享游乐场数据”。有没有人有任何见解？

import PlaygroundSupport
import Foundation

var fileName = "Csv.csv"
var csvText = "Date,Task,Time Started,Time Ended\n"
fileName.append(csvText)

let fileUrl = playgroundSharedDataDirectory.appendingPathComponent(fileName)
do {
try fileName.write(to: fileUrl, atomically: true, encoding: .utf8)
} catch {print("error")}

我有一个数组数组:

arr_of_arrs = [
  ["cart", "disk", "halt", "walk"],
  ["prot", "waco", "beau", "drab"],
  ["meet", "lick", "look", "itch"],
  ["find", "asks", "noun", "keen"],
  ["jive", "moon", "seem", "beam"]
]

我怎么能按照子阵列的指定索引处的元素的字母顺序排序这个数组数组,比如索引3,所以它的新顺序是:

[
  ["jive", "moon", "seem", "beam"],
  ["prot", "waco", "beau", "drab"],
  ["meet", "lick", "look", "itch"],
  ["find", "asks", "noun", "keen"],
  ["cart", "disk", "halt", "walk"]
] #                        ^^^^^^ index 3 is ordered