swift - 如何在 swift 中声明类型别名和枚举？

Question

我从 Lynda 中提取了这个示例，并试图将其转换为 Swift，但出现错误。有人知道如何将其成功转换为 Swift 吗？

目标-C

typedef enum { window = 99, aisle = 199, middle = 399 } seatPreference;

int main(int argc, const char * argv[]) {
@autoreleasepool {

    seatPreference bobSeatPreference = aisle;
    seatPreference fredSeatPreference = window;


    if (bobSeatPreference == window) {
        // do something
    }

    NSLog(@"Fred wants %i", fredSeatPreference);

到目前为止 swift

typealias enum { case Window = 99, case Aisle = 199, case Middle = 399 } = seatPreference

import Foundation

seatPreference bobSeatPreference = aisle
seatPreference fredSeatPreference = window

if (bobSeatPreference == window) {
    // do something
}

printLn(“Fred wants \(fredSeatPreference)”)

Answer 1

typedef enum 变成 Swift enum。您的代码可以重写如下:

enum SeatPreference:Int {
    case Window = 99
    case Aisle = 199
    case Middle = 399
}

var bobSeatPreference:SeatPreference = .Aisle
var fredSeatPreference:SeatPreference = .Window

if (bobSeatPreference == .Window) {
    // do something
}

SeatPreference.Window.toRaw() //this prints 99