[Swift 4.2] How to change Time String to seconds Integer

If you have time data in the form of a string format and want to change it to the second form to make a stopwatch, then you can follow this method below.

  let greeting = "12:14:57"
        let words = greeting.split(separator: ":")
        
        let toBe = Int(words[0])
        let toBe1 = Int(words[1])
        let toBe2 = Int(words[2])
        
        let be = toBe! * 60 * 60
        let be1 = toBe1! * 60
        let be2 = toBe2! + be1 + be
        
        print("\(words[0]), \(words[1]), \(words[2])")
        print("hasilnya: \(be2)")