如何使用协议 Encoder 在 swift 中对 Int 进行编码

Question

I was surfing in swift STD particularly in the "Int structure", and there is a function named

func encode(to encoder: Encoder) throws

https://developer.apple.com/documentation/swift/int/2894461-encode .

I saw many examples using this function, however all the examples contained structs and classes I was wondering how can I use this function to encode a variable of type Int.

Thanks

Answer 1

As you may be aware, Int conforms to Encodable which defines the encode(to:) method that you have discovered. You can use an encoder such as a JSONEncoder or PropertyListEncoder to encode any type that conforms to the Encodable protocol. For example:

let encoder = JSONEncoder()
let jsonData = try encoder.encode(5)

You don't need to worry about calling encode(to:) on Int directly. Your encoder should handle all of that under the hood.