Swift：用户输入的十六进制字符串到unicode字符

Question

I am having trouble converting a hex string that is inputted by the user (ie "1F436") to a unicode character I can work with.

From reading the Swift documentation, I learned how to print unicode characters using 'print(\\u{1F436})' and how to to figure out the decimal value of unicode characters in a string by using for-in loops.

But how do I go about creating a unicode character variable from a string that contains its hexadecimal number?

Answer 1

Very simple, just like this:

let inputText = "1F436"
let character = Int(inputText, radix: 16).map{ Character(UnicodeScalar($0)) }

character is an optional Character depending on whether the number was successfully parsed

The notation "\\u{1F436}" is only possible to use from the programmer, as it gets translated to the actual character at compile time