How UITextField move to next TextField When Click on Return Key in Keyboard

I am using this code to move UITextField and it is working but I am not happy with this code and I want (when I click return key Then Cursor move to next UITextField) this function in my registration or login form anybody can suggest me.

func textFieldDidBeginEditing(_ textField: UITextField) {
    switch textField {
    case txtFldSponsorID:
        moveTextfield(textfield: txtFldSponsorID, moveDistance: 0, up: true)
    case txtFldFullName:
        moveTextfield(textfield: txtFldFullName, moveDistance: -10, up: true)
    case txtFldEmail:
        moveTextfield(textfield: txtFldEmail, moveDistance: -10, up: true)
    case txtFldMobile:
        moveTextfield(textfield: txtFldMobile, moveDistance: -10, up: true)
    case txtFldAddress:
        moveTextfield(textfield: txtFldAddress, moveDistance: -80, up: true)
    case txtFldCity:
        moveTextfield(textfield: txtFldCity, moveDistance: -80, up: true)
    default:
        break
    }
}

func textFieldDidEndEditing(_ textField: UITextField) {
    switch textField {
    case txtFldSponsorID:
        moveTextfield(textfield: txtFldSponsorID, moveDistance: 0, up: true)
    case txtFldFullName:
        moveTextfield(textfield: txtFldFullName, moveDistance: 10, up: true)
    case txtFldEmail:
        moveTextfield(textfield: txtFldEmail, moveDistance: 10, up: true)
    case txtFldMobile:
        moveTextfield(textfield: txtFldMobile, moveDistance: 10, up: true)
    case txtFldAddress:
        moveTextfield(textfield: txtFldAddress, moveDistance: 80, up: true)
    case txtFldCity:
        moveTextfield(textfield: txtFldCity, moveDistance: 80, up: true)
    default:
        break
    }
}

func textFieldShouldReturn(_ textField: UITextField) -> Bool {
    textField.resignFirstResponder()
    return true
}

func textFieldShouldReturn(_ textField: UITextField) -> Bool {

        if textField == txtFldSponsorID {
            txtFldFullName.becomeFirstResponder()
        } else if textField == txtFldFullName {
            txtFldEmail.becomeFirstResponder()
        } else if textField == txtFldEmail {
            txtFldMobile.becomeFirstResponder()
        } else if textField == txtFldMobile {
            txtFldAddress.becomeFirstResponder()
        } else {
            txtFldCity.resignFirstResponder()
        }
        return true
    }

You can use this above UITextField Delegate method to jump to next UItextField.