Swift also provide the String Radix convert functions. This post just for sharing how to use them ~

Int

By using Int.init(_:radix:), we could covert a String to Int by specific radix.

text: The ASCII representation of a number in the radix passed as radix.

radix: The radix, or base, to use for converting text to an integer value. radix must be in the range 2…36. The default is 10.

ex:

let x = Int("123")
// x == 123

let y = Int("-123", radix: 8)
// y == -83
let y = Int("+123", radix: 8)
// y == +83

let z = Int("07b", radix: 16)
// z == 123

String

By using String.init(_:radix:uppercase:), we could convert a Int to String by specific radix.

value The value to convert to a string.

radix The base to use for the string representation. radix must be at least 2 and at most 36. The default is 10.

uppercase Pass true to use uppercase letters to represent numerals greater than 9, or false to use lowercase letters. The default is false.

ex:

let v = 999_999
print(String(v, radix: 2))
// Prints "11110100001000111111"

print(String(v, radix: 16))
// Prints "f423f"
print(String(v, radix: 16, uppercase: true))
// Prints "F423F"

Reference

https://developer.apple.com/documentation/swift/string/2997127-init

https://developer.apple.com/documentation/swift/int/2924481-init