Replacing a certain occurrence of a character in a string, for example a space(” “) is simple in Swift. Simply use the code below and substitute stringByReplacingOccurencesOfString(” “, withString: “+”) with the character you want to replace with a different character.

        let myString: String = "This is my string"
        let newString = myString.replacingOccurrences(of: " ", with: "+")
        
        print(myString)
        print(newString)

This will output the following:

This is my string
This+is+my+string

Easy!