spadafiva

class ProfileViewController: UIViewController {
    
    //  MARK: - Properties
    var mode: Mode = .viewing {
        didSet {
            updateEditingModeUI()
        }
    }
    
    //  MARK: - Outlets

spadafiva

func updateEditingModeUI() {
	nameField.isUserInteractionEnabled = mode.textfieldsEditable
	ageField.isUserInteractionEnabled = mode.textfieldsEditable
	primaryButton.setTitle ...
	secondaryButton.setTitle ...
	secondaryButton.isHidden ...
}

func handleSave() {
	// perform appropriate validations

spadafiva

enum Mode {
	/// ...

	var primaryText: String {
		switch self {
			case .editing: return "Save"
			case .viewing: return "Edit"
			case .creating:	return "Create"
		}
	}

spadafiva

enum Mode {
	case viewing
	case editing
	case creating

	var textfieldsEditable: Bool {
		switch self {
			case .editing, .creating: return true
			case .viewing: return false
		}

spadafiva

@IBAction func secondaryButtonPressed(sender: UIButton) {
	switch mode {

		case .viewing: break // This button will be hidden

		case .creating: backToSignup()      // I'm not going to define the implementation for these
		case .editing: revertTextfields()   // functions here but you can imagine that it 
										    // what they both would do
	}
}

spadafiva

@IBAction func primaryButtonPressed(sender: UIButton) {
	switch mode {
		case .viewing: mode = .editing
		case .editing, .creating: handleSave()
	}	
}

spadafiva

class ProfileViewController: UIViewController {

	// Mark: - Properties
	var mode: Mode = .viewing {
		didSet {
			updateEditingModeUI()
		}
	}
	// ... (hidden)
}

spadafiva

class ProfileViewController: UIViewController {

	// Mark Outlets
	@IBAOutlet weak var nameField: UITextField!
	@IBAOutlet weak var ageField: UITextField!
	@IBAOutlet weak var primaryButton: UIButton!
	@IBAOutlet weak var secondaryButton: UIButton!

	// Mark Button Actions
	@IBAction func primaryButtonPressed(sender: UIButton) {

spadafiva

enum Mode {
	case viewing
	case editing
	case creating

	var textfieldsEditable: Bool {
		switch self {
			case .editing, .creating: return true
			case .viewing: return false
		}

spadafiva

enum Mode {
	case viewing
	case editing
	case creating
}