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【Swift 60秒】17 - Enum associated values


0x00 Lesson

As well as storing a simple value, enums can also store ​​associated​​​ values attached to each case. This lets you attach ​​additional​​ information to your enums so they can represent more nuanced data.

For example, we might define an enum that stores various kinds of activities:

enum Activity
case bored
case running
case talking
case singing
}

That lets us say that someone is talking, but we don’t know what they talking about, or we can know that someone is running, but we don’t know where they are running to.

Enum associated values let us add those additional details:

enum Activity{
case bored
case running (destination: String)
case talking(topic: String)
case singing (volume: Int)
}

Now we can be more precise - we can say that someone is taking about football:

let talking = Activity.talking(topic: "footbal")

0x01 Tips

Associated values let you attach extra properties to any or all of your enum cases.

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