CODEWITHSUNDEEP
iosiphoneswiftuibuttonswift3
pmb
pmb

Reputation: 2327

how to send event when one button clicked

I've created UIAlertView that has 2 buttons positive button and negative button. AlertView is viewcontroller as well.

I am opening AlertVC from Main viewController.

Here is my AlertVC

class AlertVC: UIViewController {

    var transitioner : CAVTransitioner


    @IBOutlet weak var alertPositiveBtn: IFOButton!
    @IBOutlet weak var alertNegativeBtn: IFOButton!

    override init(nibName nibNameOrNil: String?, bundle nibBundleOrNil: Bundle?) {
        self.transitioner = CAVTransitioner()
        super.init(nibName: nibNameOrNil, bundle: nibBundleOrNil)
        self.modalPresentationStyle = .custom
        self.transitioningDelegate = self.transitioner
    }

    convenience init() {
        self.init(nibName:nil, bundle:nil)
    }

    required init?(coder: NSCoder) {
        fatalError("NSCoding not supported")
    }



    @IBAction func postiveBtnPressed(_ sender: IFOButton) {

    }


    @IBAction func negativeBtnPressed(_ sender: IFOButton) {

    }


    @IBAction func closeBtnPressed(_ sender: UIButton) {
        self.presentingViewController?.dismiss(animated: true, completion: nil)
    }
}

What I want: I want MainViewController somehow detect which button pressed negative or positive.

Is anyone can tell me how could I do this?

UPDATE: after using delegate pattern

@IBAction func positiveBtnPressed(_ sender: IFOButton) {
    delegate?.positiveBtnPressed(onAlertVC: self)
    self.presentingViewController?.dismiss(animated: true, completion: nil)
}

@IBAction func negativeBtnPressed(_ sender: IFOButton) {
    delegate?.negativeBtnPressed(onAlertVC: self)
    self.presentingViewController?.dismiss(animated: true, completion: nil)
}

Here is what I did on MainViewController

class MainViewController: UIViewController, AlertVCDelegate

and here is my functions

func positiveBtnPressed(onAlertVC: IFOAlertVC) {
    print("Pos")
    }
    func negativeBtnPressed(onAlertVC: IFOAlertVC) {
    print("Neg")}

It still not being called.

Upvotes: 0

Views: 122

Answers (2)

David Ganster
David Ganster

Reputation: 1993

This is a textbook example of the delegate pattern.

Add a protocol to your AlertVC:

protocol AlertVCDelegate : class {
    func positiveBtnPressed(onAlertVC: AlertVC)
    func negativeBtnPressed(onAlertVC: AlertVC)
}

Then create a weak property in your AlertVC class and pass the button presses to it:

class AlertVC : UIViewController {
    weak var delegate: AlertVCDelegate?
    ...
    @IBAction func postiveBtnPressed(_ sender: IFOButton) {
        delegate?.positiveBtnPressed(onAlertVC: self)
    }


    @IBAction func negativeBtnPressed(_ sender: IFOButton) {
        delegate?.negativeBtnPressed(onAlertVC: self)
    }
}

Implement the AlertVCDelegate protocol in your MainViewController, and set the delegate when you present the AlertVC from your MainViewController.

If you present the alert vc from a segue, use the prepare(for: sender:) method to set the MainViewController as the delegate.

Upvotes: 2

Adolfo
Adolfo

Reputation: 1862

You have to CTRL + Drag the button from your app Storyboard to their own method.

Your IFOButton should be an UIButton derived class (inheritance).

Even you only need one method to do that

@IBAction internal func handleButtonTap(_ sendder: UIButton) -> Void
{
    if sender === alertPositiveBtn
    {
         // Do something positive here
    }
    else
    {
        // Do something negative here
    }
}

Upvotes: 0

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