generate random text in Swift

randomText.swift

// returns random text of a defined length
// optional bool parameter justLowerCase
// to just generate random lowercase text
func randomText(length: Int, justLowerCase: Bool = false) -> String {
    var text = ""
    for _ in 1...length {
        var decValue = 0  // ascii decimal value of a character
        var charType = 3  // default is lowercase
        if justLowerCase == false {
            // randomize the character type
            charType =  Int(arc4random_uniform(4))
        }
        switch charType {
        case 1:  // digit: random Int between 48 and 57
            decValue = Int(arc4random_uniform(10)) + 48
        case 2:  // uppercase letter
            decValue = Int(arc4random_uniform(26)) + 65
        case 3:  // lowercase letter
            decValue = Int(arc4random_uniform(26)) + 97
        default:  // space character
            decValue = 32
        }
        // get ASCII character from random decimal value
        let char = String(UnicodeScalar(decValue))
        text = text + char
        // remove double spaces
        text = text.stringByReplacingOccurrencesOfString("  ", withString: " ")
    }
    return text
}