How to convert an Int to Hex String in Swift

Question

In Obj-C I used to convert an unsigned integer n to a hex string with

 NSString *st = [NSString stringWithFormat:@\"%2X\", n];

I tried for

Answer 1

Answers above work fine for values in the range of a 32 bit Int, but values over this won't work as the value will roll over.

You need to use the length modifier for values greater than a 32bit Int

%x = Unsigned 32-bit integer (unsigned int)

ll = Length modifiers specifying that a following d, o, u, x, or X conversion specifier applies to a long long or unsigned long long argument.

let hexString = String(format:"%llX", decimalValue)