var filteredArray:NSArray = [] //to store filtered data



func textField(textField: UITextField, shouldChangeCharactersInRange range: NSRange, replacementString string: String) -> Bool {
        let string1 = string
        let string2 = searchText.text
        var finalString = ""

        if string.characters.count > 0 { // if it was not delete character
            finalString = string2! + string1
        } else {

            if (string2?.characters.count)! > 0 {

                finalString = String(describing: string2?.characters.dropLast())
            }

            filteredArray(searchString: finalString)
        }

            return true


    }