blocks|key|4599167|text|在swift+3中，你可以使用这个|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4599168|var+enumValue+=+Customer.Physics
var+str+=+String(describing:+enumValue)|code-block|syntax|javascript|4599169|来自Swift+how+to+use+enum+to+get+string+value|offset|length|4599170|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/38607706/swift-how-to-use-enum-to-get-string-value/41870027#41870027^0|0|0|2|15|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@$I|V|J|W|1|X]]|A|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]]]

In swift 3, you can use this

<pre><code>var enumValue = Customer.Physics
var str = String(describing: enumValue)
</code></pre>

from <a href="https://stackoverflow.com/questions/38607706/swift-how-to-use-enum-to-get-string-value/41870027#41870027">Swift how to use enum to get string value</a>

blocks|key|92729|text|现在，我将重新定义枚举为：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|92730|enum+Audience:+String+{
++++case+Public+=+"Public"
++++case+Friends+=+"Friends"
++++case+Private+=+"Private"
}|code-block|syntax|javascript|92731|这样我就可以做到：|92732|audience.toRaw()+//+"Public"|92733|但是，这个新的枚举定义不是多余的吗？我是否可以保留初始枚举定义并执行以下操作：|92734|audience.toString()+//+"Public"|92735|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|U|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

For now, I'll redefine the enum as:

<pre><code>enum Audience: String {
 case Public = "Public"
 case Friends = "Friends"
 case Private = "Private"
}
</code></pre>

so that I can do:

<pre><code>audience.toRaw() // "Public"
</code></pre>

But, isn't this new enum definition redundant? Can I keep the initial enum definition and do something like:

<pre><code>audience.toString() // "Public"
</code></pre>

blocks|key|92895|text|我喜欢在Raw+Values中使用Printable。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|92896|enum+Audience:+String,+Printable+{
++++case+Public+=+"Public"
++++case+Friends+=+"Friends"
++++case+Private+=+"Private"

++++var+description:+String+{
++++++++return+self.rawValue
++++}
}|code-block|syntax|javascript|92897|然后我们可以这样做：|92898|let+audience+=+Audience.Public.description+//+audience+=+"Public"|92899|或|92900|println("The+value+of+Public+is+\(Audience.Public)")+
//+Prints+"The+value+of+Public+is+Public"|92901|entityMap^0|4|A|H|9|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]|$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|Z|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|10|8|@]|D|@]|E|$]]|$1|M|3|N|5|H|7|11|8|@]|D|@]|E|$I|J]]|$1|O|3|P|5|6|7|12|8|@]|D|@]|E|$]]|$1|Q|3|R|5|H|7|13|8|@]|D|@]|E|$I|J]]|$1|S|3|-4|5|6|7|14|8|@]|D|@]|E|$]]]|T|$]]

I like to use <code>Printable</code> with <code>Raw Values</code>.

<pre><code>enum Audience: String, Printable {
 case Public = "Public"
 case Friends = "Friends"
 case Private = "Private"

 var description: String {
 return self.rawValue
 }
}
</code></pre>

Then we can do:

<pre><code>let audience = Audience.Public.description // audience = "Public"
</code></pre>

or

<pre><code>println("The value of Public is \(Audience.Public)") 
// Prints "The value of Public is Public"
</code></pre>

blocks|key|4599071|text|针对Xcode+7+GM的发布进行了更新。它现在就像人们所希望的那样工作--谢谢苹果！|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4599072|enum+Rank:Int+{
++++case+Ace+=+1,+Two,+Three,+Four,+Five,+Six,+Seven,+Eight,+Nine,+Ten,+Jack,+Queen,+King
}

let+r+=+Rank.Ace

print(r)+++++++++++++++//+prints+"Ace"
print("Rank:+\(r)!")+++//+prints+"Rank:+Ace!"|code-block|syntax|javascript|4599073|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Updated for the release of Xcode 7 GM. It works as one would hope now--thanks Apple!

<pre><code>enum Rank:Int {
 case Ace = 1, Two, Three, Four, Five, Six, Seven, Eight, Nine, Ten, Jack, Queen, King
}

let r = Rank.Ace

print(r) // prints "Ace"
print("Rank: \(r)!") // prints "Rank: Ace!"
</code></pre>

blocks|key|4599210|text|如果在枚举中使用Ints，则为swift+3及更高版本的示例|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4599211|public+enum+ECategory+:+Int{
++++++++case+Attraction=0,+FP,+Food,+Restroom,+Popcorn,+Shop,+Service,+None;
++++++++var+description:+String+{
++++++++++++return+String(describing:+self)
++++++++}
++++}

let+category+=+ECategory.Attraction
let+categoryName+=+category.description+//string+Attraction|code-block|syntax|javascript|4599212|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

A swift 3 and above example if using Ints in Enum

<pre><code>public enum ECategory : Int{
 case Attraction=0, FP, Food, Restroom, Popcorn, Shop, Service, None;
 var description: String {
 return String(describing: self)
 }
 }

let category = ECategory.Attraction
let categoryName = category.description //string Attraction
</code></pre>

blocks|key|93015|text|对于任何阅读“Swift编程语言”的“Swift+Tour”一章中的示例并寻找简化simpleDescription()方法的人来说，通过执行String(self)将枚举本身转换为字符串可以做到这一点：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|93016|enum+Rank:+Int
{
++++case+Ace+=+1+//required+otherwise+Ace+will+be+0
++++case+Two,+Three,+Four,+Five,+Six,+Seven,+Eight,+Nine,+Ten
++++case+Jack,+Queen,+King
++++func+simpleDescription()+->+String+{
++++++++switch+self+{
++++++++++++case+.Ace,+.Jack,+.Queen,+.King:
++++++++++++++++return+String(self).lowercaseString
++++++++++++default:
++++++++++++++++return+String(self.rawValue)
++++++++}
+++++}
+}|code-block|syntax|javascript|93017|entityMap^0|1Z|C|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

For anyone reading the example in "A Swift Tour" chapter of "The Swift Programming Language" and looking for a way to simplify the simpleDescription() method, converting the enum itself to String by doing <code>String(self)</code> will do it:

<pre><code>enum Rank: Int
{
 case Ace = 1 //required otherwise Ace will be 0
 case Two, Three, Four, Five, Six, Seven, Eight, Nine, Ten
 case Jack, Queen, King
 func simpleDescription() -&gt; String {
 switch self {
 case .Ace, .Jack, .Queen, .King:
 return String(self).lowercaseString
 default:
 return String(self.rawValue)
 }
 }
 }
</code></pre>

blocks|key|92789|text|在尝试了几种不同的方法后，我发现如果您不想使用：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|92790|let+audience+=+Audience.Public.toRaw()|code-block|syntax|javascript|92791|您仍然可以使用struct对其进行存档|92792|struct+Audience+{
+++static+let+Public++=+"Public"
+++static+let+Friends+=+"Friends"
+++static+let+Private+=+"Private"
}|92793|然后你的代码：|92794|let+audience+=+Audience.Public|92795|会像预期的那样工作。它并不美观，也有一些缺点，因为你没有使用“枚举”，你不能使用快捷方式，只添加.Private也不能切换大小写。|92796|entityMap^0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|W|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|X|8|@]|9|@]|A|$E|F]]|$1|O|3|P|5|6|7|Y|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

After try few different ways, i found that if you don't want to use:

<pre><code>let audience = Audience.Public.toRaw()
</code></pre>

You can still archive it using a struct

<pre><code>struct Audience {
 static let Public = "Public"
 static let Friends = "Friends"
 static let Private = "Private"
}
</code></pre>

then your code:

<pre><code>let audience = Audience.Public
</code></pre>

will work as expected. It isn't pretty and there are some downsides because you not using a "enum", you can't use the shortcut only adding .Private neither will work with switch cases.

blocks|key|4598972|text|有多种方法可以做到这一点。您可以在枚举中定义一个函数，该函数根据枚举类型的值返回字符串：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4598973|enum+Audience{
++++...
func+toString()->String{
++var+a:String

++switch+self{
+++case+.Public:
++++a="Public"
+++case+.Friends:
++++a="Friends"
+++...
+}
+return+a
}|code-block|syntax|javascript|4598974|或者你可以试试这个：|4598975|enum+Audience:String{
+++case+Public="Public"
+++case+Friends="Friends"
+++case+Private="Private"
}|4598976|并使用它：|4598977|var+a:Audience=Audience.Public
println(a.toRaw())|4598978|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|U|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

There are multiple ways to do this. Either you could define a function in the enum which returns the string based on the value of enum type:

<pre><code>enum Audience{
 ...
func toString()-&gt;String{
 var a:String

 switch self{
 case .Public:
 a="Public"
 case .Friends:
 a="Friends"
 ...
 }
 return a
}
</code></pre>

Or you could can try this:

<pre><code>enum Audience:String{
 case Public="Public"
 case Friends="Friends"
 case Private="Private"
}
</code></pre>

And to use it:

<pre><code>var a:Audience=Audience.Public
println(a.toRaw())
</code></pre>

blocks|key|93102|text|从Swift+3.0开始，您可以|type|unstyled|depth|inlineStyleRanges|entityRanges|data|93103|var+str+=+String(describing:+Audience.friends)|code-block|syntax|javascript|93104|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Starting from Swift 3.0 you can
<pre><code>var str = String(describing: Audience.friends)
</code></pre>

blocks|key|93168|text|另一种方法|type|unstyled|depth|inlineStyleRanges|entityRanges|data|93169|public+enum+HTTP{
case+get
case+put
case+delete
case+patch
var+value:+String?+{
return+String(describing:+self)
}|code-block|syntax|javascript|93170|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

One more way
<pre><code>public enum HTTP{
case get
case put
case delete
case patch
var value: String? {
return String(describing: self)
}
</code></pre>

blocks|key|4599337|text|如果您需要使用静态字符串作为枚举值，请按指南友好：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4599338|class+EncyclopediaOfCats+{
++++struct+Constants+{
++++++++static+var+playHideAndSeek:+String+{+"Play+hide-and-seek"+}
++++++++static+var+eat:+String+{+"Eats"+}
++++++++static+var+sleep:+String+{+"Sleep"+}
++++++++static+var+beCute:+String+{+"Be+cute"+}
++++}
}

enum+CatLife+{
++++case+playHideAndSeek
++++case+eat
++++case+sleep
++++case+beCute

++++typealias+RawValue+=+String
++++
++++var+rawValue:+String+{
++++++++switch+self+{
++++++++case+.playHideAndSeek:
++++++++++++return+EncyclopediaOfCats.Constants.playHideAndSeek
++++++++case+.eat:
++++++++++++return+EncyclopediaOfCats.Constants.eat
++++++++case+.sleep:
++++++++++++return+EncyclopediaOfCats.Constants.sleep
++++++++case+.beCute:
++++++++++++return+EncyclopediaOfCats.Constants.beCute
++++++++}
++++}
++++
++++init?(rawValue:+CatLife.RawValue)+{
++++++++switch+rawValue+{
++++++++case+EncyclopediaOfCats.Constants.playHideAndSeek:
++++++++++++self+=+.playHideAndSeek
++++++++case+EncyclopediaOfCats.Constants.eat:
++++++++++++self+=+.eat
++++++++case+EncyclopediaOfCats.Constants.sleep:
++++++++++++self+=+.sleep
++++++++case+EncyclopediaOfCats.Constants.beCute:
++++++++++++self+=+.beCute
++++++++default:
++++++++++++self+=+.playHideAndSeek
++++++++}
++++}
}|code-block|syntax|javascript|4599339|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Friendly by guides if you need to use static strings as enum values:
<pre><code>class EncyclopediaOfCats {
 struct Constants {
 static var playHideAndSeek: String { &quot;Play hide-and-seek&quot; }
 static var eat: String { &quot;Eats&quot; }
 static var sleep: String { &quot;Sleep&quot; }
 static var beCute: String { &quot;Be cute&quot; }
 }
}

enum CatLife {
 case playHideAndSeek
 case eat
 case sleep
 case beCute

 typealias RawValue = String
 
 var rawValue: String {
 switch self {
 case .playHideAndSeek:
 return EncyclopediaOfCats.Constants.playHideAndSeek
 case .eat:
 return EncyclopediaOfCats.Constants.eat
 case .sleep:
 return EncyclopediaOfCats.Constants.sleep
 case .beCute:
 return EncyclopediaOfCats.Constants.beCute
 }
 }
 
 init?(rawValue: CatLife.RawValue) {
 switch rawValue {
 case EncyclopediaOfCats.Constants.playHideAndSeek:
 self = .playHideAndSeek
 case EncyclopediaOfCats.Constants.eat:
 self = .eat
 case EncyclopediaOfCats.Constants.sleep:
 self = .sleep
 case EncyclopediaOfCats.Constants.beCute:
 self = .beCute
 default:
 self = .playHideAndSeek
 }
 }
}
</code></pre>

blocks|key|93151|text|使用Ruby方式|type|unstyled|depth|inlineStyleRanges|entityRanges|data|93152|var+public:+String+=+"\(Audience.Public)"|code-block|syntax|javascript|93153|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Use Ruby way
<pre><code>var public: String = &quot;\(Audience.Public)&quot;
</code></pre>

blocks|key|93302|text|您也可以使用"\(enumVal)"，下面是一个示例：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|93303|enum+WeekDays{+case+Sat,+Sun,+Mon,+Tue,+Wed,+The,+Fri+}+

let+dayOfWeek:+String+=+"\(WeekDays.Mon)"|code-block|syntax|javascript|93304|在Swift+5中试用和测试|93305|entityMap^0|6|C|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|S|8|@]|D|@]|E|$]]|$1|M|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|N|$]]

You can also use <code>&quot;\(enumVal)&quot;</code>
Here is an example :
<pre><code>enum WeekDays{ case Sat, Sun, Mon, Tue, Wed, The, Fri } 

let dayOfWeek: String = &quot;\(WeekDays.Mon)&quot;
</code></pre>
Tried and tested in Swift 5

blocks|key|4599371|text|我同意上述所有答案，但在枚举中，不能定义private和public案例，因为它们是默认关键字。我在我的答案中包括了CaseIterable，如果你需要循环，它可能会帮助你得到所有的案例。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4599372|enum+Audience:+String,+CaseIterable+{
case+publicAudience
case+friends
case+privateAudience

var+description:+String+{
++++switch+self+{
++++case+.publicAudience:+return+"Public"
++++case+.friends:+return+"Friends"
++++case+.privateAudience:+return+"Private"
++++}
}

static+var+allAudience:+[String]+{
++++return+Audience+{+$0.rawValue+}
}|code-block|syntax|javascript|4599373|}|4599374|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

I agree with all the above answers but in your enum private and the public cases can't be defined since those are default keywords. I'm including CaseIterable in my answer, it may help you to get all cases if you required to loop over.
<pre><code>enum Audience: String, CaseIterable {
case publicAudience
case friends
case privateAudience

var description: String {
 switch self {
 case .publicAudience: return &quot;Public&quot;
 case .friends: return &quot;Friends&quot;
 case .privateAudience: return &quot;Private&quot;
 }
}

static var allAudience: [String] {
 return Audience { $0.rawValue }
}
</code></pre>
}

Given the following enum:

<pre><code>enum Audience {
 case Public
 case Friends
 case Private
}
</code></pre>

How do I get the string <code>"Public"</code> from the <code>audience</code> constant below?

<pre><code>let audience = Audience.Public
</code></pre>

Swift: Convert enum value to String?

Swift

Xcode

给定以下枚举：enum Audience {    case Public    case Friends    case Private}如何从下面的audience常量中获取字符串"Public"？let audience = Audience.Public

问Swift:是否将枚举值转换为字符串？
EN

回答 14

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问Swift:是否将枚举值转换为字符串？EN

回答 14

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问Swift:是否将枚举值转换为字符串？
EN