关于ios:Swift-Learning-Summary-Nested-Types

Nested Types

Enumerations, classes or structures can be nested in another type.

struct Closh {    enum Size: String{        case H = "high", M = "Medium", L = "Low"    }        enum Detail: Int {        case H = 180, M = 170, L = 160        struct Price {            let normal: Int, discount: Int?        }        var price: Price {            switch self {            case .H:                return Price(normal: 100, discount: 90)            case .M:                return Price(normal: 90, discount: 80)            case .L:                return Price(normal: 80, discount: 70)            default:                return Price(normal: self.rawValue, discount: nil)            }        }    }        let size: Size, detail: Detail    var description: String {        return "\(size.rawValue), PriceNormal: \(detail.price.normal) PriceDiscount: \(detail.price.discount)"      }}var closh = Closh(size: .M, detail: .M)print(closh.description)// Print: Medium, PriceNormal: 90 PriceDiscount: Optional(80)

Referring to Nested Types

var L = Closh.Size.L.rawValueprint(L)     // Low