Swift: How to convert String to UInt?

Question

According to Swift - Converting String to Int, there\'s a String method toInt().

But, there\'s no toUInt() method. So, how to conv

Answer 1

You might be interested in a safer solution similar to:

let uIntString = "4"
let nonUIntString = "foo"

extension String {
    func toUInt() -> UInt? {
        let scanner = NSScanner(string: self)
        var u: UInt64 = 0
        if scanner.scanUnsignedLongLong(&u)  && scanner.atEnd {
            return UInt(u)
        }
        return nil
    }
}

uIntString.toUInt()     // Optional(4)
nonUIntString.toUInt()  // nil

Hope this helps

// Edited following @Martin R. suggestion