[英]Enumeration on enums with associated values - Swift
I have an enum with associated values. 我有一个带有关联值的枚举。 In addition, every value has a String description.
此外,每个值都有一个String描述。 How can I get description of all the cases?
如何获得所有情况的描述?
enum MyEnum {
case caseA(data: [DataOfTypeA])
case caseB(data: [DataOfTypeB])
case caseC(data: [DataOfTypeC])
case caseD(data: [DataOfTypeD])
var typeDescription: String {
switch self {
case .caseA:
return "caseA"
case .caseB:
return "caseB"
case .caseC:
return "caseC"
case .caseD:
return "caseD"
}
}
}
The thing I am looking for is: 我正在寻找的是:
"caseA, caseB, caseC, caseD"
You can make your enum
conform to CaseIterable
, then simply iterate through allCases
to create typeDescription
. 您可以使您的
enum
符合CaseIterable
,然后简单地遍历allCases
来创建typeDescription
。
enum MyEnum: CaseIterable {
case caseA(data: [Int])
case caseB(data: [String])
case caseC(data: [Date])
case caseD(data: [Data])
static var allCases: [MyEnum] = [.caseA(data: []), .caseB(data: []), .caseC(data: []), .caseD(data: [])]
var caseDescription: String {
switch self {
case .caseA:
return "caseA"
case .caseB:
return "caseB"
case .caseC:
return "caseC"
case .caseD:
return "caseD"
}
}
static var typeDescription: String {
return allCases.map {$0.caseDescription}.joined(separator: ", ")
}
}
Imagine you have this variable: 假设您有以下变量:
let myEnum = MyEnum.caseA(data: [])
for accessing associated values: 用于访问关联值:
switch myEnum {
case .caseA(let data): print(data)
case .caseB(let data): print(data)
case .caseC(let data): print(data)
case .caseD(let data): print(data)
}
for accessing typeDescription
: 用于访问
typeDescription
:
print(myEnum.typeDescription)
Or for any case without having a variable: 或在没有变量的情况下 :
print(MyEnum.caseA(data: []).typeDescription)
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