Swift 4 Cocoa reading formatted data into variable

Question

I need to read some formatted data from a string and store it in two variables. The string has this format:

data = "(1234),(-567)"

The numbers are of varying lengths and signs. I feel like this should be simple. It would be easy in C:

scanf(data, "(%d),(%d)", num1, num2)

But in Swift, I'm pulling my hair out trying to find an easy way to do this. As suggested in other answers, I've tried:

data.components(separatedBy: CharacterSet.decimalDigits.inverted)

However this overlooks minus signs. Any help is much appreciated!

Answer 1

You can use Scanner when you need scanf-like behavior:

let data = "(1234),(-567)"

var num1: CInt = 0
var num2: CInt = 0
let scanner = Scanner(string: data)
if
    scanner.scanString("(", into: nil),
    scanner.scanInt32(&num1),
    scanner.scanString("),(", into: nil),
    scanner.scanInt32(&num2),
    scanner.scanString(")", into: nil)
{
    print(num1, num2)
} else {
    print("failed")
}