元组中的类型推断？

Question

let http404Error = (statusCode: 404, statusMessage: "Not found")
print(http404Error.0, http404Error.1)

I got some questions and "problems" with tuples:

Question 1:
But what if I want the statusCode to be an Int and an Int only?
Because "statusCode: Int = 404" doesn´t seem to work?

Question 2:
What if I want to shorten the part "print(http404Error.0, http404Error.1)?
Is there a short way to write it, something like print(http404Error.[0, 1])?

Thanks for your help :)

Answer 1

你可以试试

let http404Error:(Int,String) = (statusCode: 404, statusMessage: "Not found")

Answer 2

For specifying the type, you can define a type alias like:

typealias HttpStatus = (statusCode: Int, statusMessage: String)
let http404Error     = HttpStatus(403, "Not found")
print(http404Error.0, http404Error.1)

For shortening the print statement, I don't think there is an easy way to do that. One thing you can do is, you can create a custom function which takes the tuple as argument, formats the values and returns a string.

func getStatus(_ status: HttpStatus) -> String {
    return "\(status.statusCode) \(status.statusMessage)"
}

print(getStatus(http404Error))