快速枚举镜像获取关联值名称

Question

I need to get the name of enum associated value.

for example:

enum App{
    case iOS(version:String)
    case android(version:String, build:Int)
}
let iosApp = App.iOS(version:"2.30.11")
let androidApp = App.android(version:"2.30.11",build:101)
let iosMirror = Mirror(reflecting: iosApp)
for case let (key?, value) in iosMirror.children {
        print("\(key)-\(value)") //this will print:iOS-2.30.11，missing the value name-"version"，the string "version" was I need.
}
let androidMirror = Mirror(reflecting: androidApp)
for case let (key?, value) in androidMirror.children {
        print("\(key)-\(value)") //this will print:android-(version:"2.30.11",build:101)
}

question: I want get the associated value name "version" of iosApp from iosMirror，How should i do? or using other way(not Mirror) to get strings "version".

Answer 1

Not sure if this is what you are after but you could let your enum implement CustomStringConvertible to get a specific output.

enum App : CustomStringConvertible {
    var description: String { get {
        switch self {
            case .iOS(version: let v):
                return "version: \(v)"
            case .android(version: let v, build: let b):
                return "version: \(v) build: \(b)"
            }
        }
    }

    case iOS(version: String)
    case android(version:String, build:Int)
}

let iosApp = App.iOS(version:"2.30.11")
let androidApp = App.android(version:"2.30.11",build:101)

print(iosApp)
print(androidApp)

Answer 2

iOS-(version: "2.30.11") android-(version: "2.30.11", build: 101)gets printed with Xcode10(Swift4.2) so it is a bug from an older version.

-@Purpose

I tested this code in Xcode 10-beta 6，it print iOS-(version: "2.30.11"). this question solved.

thanks @Purpose.