Remove special characters from the string

Question

I am trying to use an iOS app to dial a number. The problem is that the number is in the following format:

po placeAnnotation.mapItem.phoneNumber!
"‎+1 (832) 831-6486"

I want to get rid of some special characters and I want the following:

832-831-6486

I used the following code but it did not remove anything:

let charactersToRemove = CharacterSet(charactersIn: "()+-")
var telephone = placeAnnotation.mapItem.phoneNumber?.trimmingCharacters(in: charactersToRemove)

Any ideas?

Answer 1

placeAnnotation.mapItem.phoneNumber!.components(separatedBy: CharacterSet.decimalDigits.inverted)
    .joined()

Here you go!

I tested and works well.