Login or Register Segmented Control Button

Question

I currently have login / register button working with segmented controls. I am trying to use the button login to use the handleLogin function, and the register button to use the handleRegister function. I currently try to call these functions this way, but no luck. My code is below:

@IBAction func indexChanged(_ sender: UISegmentedControl) {
        switch loginRegisterSegmentedControl.selectedSegmentIndex {
        case 0:
            nameTextField.isHidden = true
            universityTextField.isHidden = true
            universityDropDown.isHidden = true
            loginRegisterButton.setTitle("Login", for: UIControlState())
            loginRegisterButton.addTarget(self, action: #selector(handleLogin), for: .touchUpInside)
        case 1:
            universityTextField.isHidden = false
            nameTextField.isHidden = false
            loginRegisterButton.setTitle("Register", for: UIControlState())
            loginRegisterButton.addTarget(self, action: #selector(handleRegister), for: .touchUpInside)
        default:
            break;
        }
    }

Answer 1

First of all, you can write separate function for changing interface according to selectedIndex of the UISegmentedControl. Also, you need only one Target to perform particular action. So, before adding a target you need to remove other all targets. Else you will get multiple actions at a time of pressing the loginRegisterButton.

func changeInterfaceAccoringto(_ index:Int){

    /*Remove all targets before add*/
    loginRegisterButton.removeTarget(nil, action: nil, for: .allEvents)

    switch index {
    case 0:
        nameTextField.isHidden = true
        universityTextField.isHidden = true
        universityDropDown.isHidden = true
        loginRegisterButton.setTitle("Login", for: UIControlState())
        loginRegisterButton.addTarget(self, action: #selector(handleLogin), for: .touchUpInside)
    case 1:
        universityTextField.isHidden = false
        nameTextField.isHidden = false
        loginRegisterButton.setTitle("Register", for: UIControlState())
        loginRegisterButton.addTarget(self, action: #selector(handleRegister), for: .touchUpInside)
    default:
        break;
    }
}

call changeInterfaceAccoringto at indexChanged like as below,

@IBAction func indexChanged(_ sender: UISegmentedControl) {

    changeInterfaceAccoringto(loginRegisterSegmentedControl.selectedSegmentIndex)
}

For changing Interface at ideal you need to call changeInterfaceAccoringto in method viewDidLoad like as below,

override func viewDidLoad() {
    super.viewDidLoad()
    /*Change UISegmentedControl selected index at ideal if you want*/
    //loginRegisterSegmentedControl.selectedSegmentIndex = 1

    changeInterfaceAccoringto(loginRegisterSegmentedControl.selectedSegmentIndex)
}

Let me know is that you need?