arrays - 使用常量初始化 swift 数组

Question

我有一个二维数组，我试图用它来将一组值从选择器映射到一组特定的值。我想让它可读，所以我尝试使用 C 风格并将我的一组值定义为常量，然后在初始化中使用它们，但是我收到一个错误，告诉我我的类没有名为常量的成员.我在 Playground 上测试了它，一切正常，因为 Playground 是解释性的。任何人都知道如何最好地解决这个问题。我知道如何从技术角度解决问题，但对保持可读性很着迷。下面是代码吸管

// definitions for FORCE objects

let LIVELY              = 0
let LIGHT               = 1
let ROUNDED             = 2
let POWERFUL            = 3
let CHAMPAGNE           = 4
let SUCREBLANC          = 5
let SUCREROUGEOUBLANC   = 6
let SUCREROUGE          = 7
let CHAMPAGNEROSE       = 8
let ROSE                = 9

//definitions for SAVEUR objects

let FLORAL              = 0
let FRUITY              = 1
let OAKY                = 2
let SPICY               = 3

let redForceNamePointerArray = [
    /*           1     2        3       4      5        6            7             8         9       10      11         12    */
    /* 1 */   [LIGHT,ROUNDED,POWERFUL,NOIMAGE,LIGHT,CHAMPAGNE,SUCREROUGEOUBLANC,CHAMPAGNE,ROUNDED,ROUNDED,SUCREBLANC,POWERFUL],
    /* 1 */   [LIGHT,ROUNDED,POWERFUL,NOIMAGE,LIGHT,CHAMPAGNE,SUCREROUGEOUBLANC,CHAMPAGNE,ROUNDED,ROUNDED,SUCREBLANC,POWERFUL],
    /* 1 */   [LIGHT,ROUNDED,POWERFUL,NOIMAGE,LIGHT,CHAMPAGNE,SUCREROUGEOUBLANC,CHAMPAGNE,ROUNDED,ROUNDED,SUCREBLANC,POWERFUL],
    /* 1 */   [LIGHT,ROUNDED,POWERFUL,NOIMAGE,LIGHT,CHAMPAGNE,SUCREROUGEOUBLANC,CHAMPAGNE,ROUNDED,ROUNDED,SUCREBLANC,POWERFUL],
    /* 1 */   [LIGHT,ROUNDED,POWERFUL,NOIMAGE,LIGHT,CHAMPAGNE,SUCREROUGEOUBLANC,CHAMPAGNE,ROUNDED,ROUNDED,SUCREBLANC,POWERFUL],
    /* 1 */   [LIGHT,ROUNDED,POWERFUL,NOIMAGE,LIGHT,CHAMPAGNE,SUCREROUGEOUBLANC,CHAMPAGNE,ROUNDED,ROUNDED,SUCREBLANC,POWERFUL]];

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Answer 1

常量初始值设定项不能引用类中的其他常量。这是语言或编译器的限制。这是一个替代方案:

class C {
    enum Image: Int {
        case NOIMAGE = -1
        case LIVELY
        case LIGHT
        case ROUNDED
        case POWERFUL
        case CHAMPAGNE
        case SUCREBLANC
        case SUCREROUGEOUBLANC
        case SUCREROUGE
        case CHAMPAGNEROSE
        case ROSE
    }

    enum Flavor: Int {
        case FLORAL = 0
        case FRUITY
        case OAKY
        case SPICY
    }

    let redForceNamePointerArray: [[Image]] = {
        typealias I = Image
        return [
            /*           1     2        3       4      5        6            7             8         9       10      11         12    */
            /* 1 */   [I.LIGHT,I.ROUNDED,I.POWERFUL,I.NOIMAGE,I.LIGHT,I.CHAMPAGNE,I.SUCREROUGEOUBLANC,I.CHAMPAGNE,I.ROUNDED,I.ROUNDED,I.SUCREBLANC,I.POWERFUL],
            /* 1 */   [I.LIGHT,I.ROUNDED,I.POWERFUL,I.NOIMAGE,I.LIGHT,I.CHAMPAGNE,I.SUCREROUGEOUBLANC,I.CHAMPAGNE,I.ROUNDED,I.ROUNDED,I.SUCREBLANC,I.POWERFUL]
        ]
    }()
}

但是现在 redForceNamePointerArray 的元素是 C.Image 而不是 Int。如果您真的希望它们是 Int:

    let redForceNamesInt: [[Int]] = {
        typealias I = Image
        return [
            /*           1     2        3       4      5        6            7             8         9       10      11         12    */
            /* 1 */   [I.LIGHT,I.ROUNDED,I.POWERFUL,I.NOIMAGE,I.LIGHT,I.CHAMPAGNE,I.SUCREROUGEOUBLANC,I.CHAMPAGNE,I.ROUNDED,I.ROUNDED,I.SUCREBLANC,I.POWERFUL],
            /* 1 */   [I.LIGHT,I.ROUNDED,I.POWERFUL,I.NOIMAGE,I.LIGHT,I.CHAMPAGNE,I.SUCREROUGEOUBLANC,I.CHAMPAGNE,I.ROUNDED,I.ROUNDED,I.SUCREBLANC,I.POWERFUL]
        ].map { $0.map { $0.rawValue } }
    }()