gistfile1.swift

    private func validateInputs() -> Bool {
        
        let nonEmpty = {
            (data:String!) -> Bool in
            return count(data) != 0
        }
        func inRange (min: Int!, max:Int!) -> (String!) -> Bool {
            return { (data:String!) -> Bool in
                let dataAsInt = data.toInt()
                return (dataAsInt! >= min && dataAsInt! <= max)
            }
        }
        
        var inputs : [UITextField: (String, [String! -> Bool] )] = [
            cpfField!: ("Ops, enter yoru id", [nonEmpty]),
            pwdField!: ("enter your password", [nonEmpty]),
            dobDayField!: ("invalid day", [nonEmpty, inRange(1, 31)]),
            dobMonthField!: ("Invalid month", [nonEmpty, inRange(1, 12)]),
            dobYearField!: ("Invalid year", [nonEmpty, inRange(1900, 2010)]),
        ]
        
        func applyValidationRules(inputs:[UITextField: (String, [String! -> Bool] )]) -> Bool {
            for entry in inputs {
                let input = entry.0
                let (errorMessage, rules) = entry.1
                
                for rule in rules {
                    if (!rule(input.text)) {
                        showError(errorMessage)
                        input.becomeFirstResponder()
                        return false
                    }
                }
            }
            return true
        }
        
        return applyValidationRules(inputs)
    }