Email & Phone Validation in Swift

Question

i am using the following code for phone number validation. But i am getting the following error. I cant able to proceed further. Help us to take it forward.

Answer 1

For Swift 3.0 and above

var isPhoneNumber: Bool{
let allowedCharacters = CharacterSet(charactersIn: "+0123456789").inverted
let inputString = components(separatedBy: allowedCharacters)
let filtered = inputString.joined(separator: "")
return self == filtered}