CODEWITHSUNDEEP
iosswiftdelegatesuitabbarcontrollerprotocols
Tester
Tester

Reputation: 685

ios - Custom delegate method is not triggered

I have added a round button in TabBarController using the following code

import UIKit

protocol AddButtonProtocol: class {
   func addButtonIsClicked()
}

 class MainTabBar: UITabBar {

     open var buttonDelegate: AddButtonProtocol?
    private var middleButton = UIButton()

    override open func awakeFromNib() {
        super.awakeFromNib()
        setupMiddleButton()
    }

    override open func hitTest(_ point: CGPoint, with event: UIEvent?) -> UIView? {
        if self.isHidden {
            return super.hitTest(point, with: event)
        }

        let from = point
        let to = middleButton.center

        return sqrt((from.x - to.x) * (from.x - to.x) + (from.y - to.y) * (from.y - to.y)) <= 39 ? middleButton : super.hitTest(point, with: event)
    }

    func setupMiddleButton() {
        middleButton.frame.size = CGSize(width: 70, height: 70)
        middleButton.backgroundColor = .blue
        middleButton.layer.cornerRadius = 35
        middleButton.layer.masksToBounds = true
        middleButton.center = CGPoint(x: UIScreen.main.bounds.width / 2, y: 0)
        middleButton.addTarget(self, action: #selector(test), for: .touchUpInside)
        addSubview(middleButton)
    }

    @objc func test() {
        print("add button is clicked")
        buttonDelegate?.addButtonIsClicked()

    }
}

It looks like this.

enter image description here

Now whenever I click that button, the method in HomeScreenVCViewController should be triggered. So I have implemented the protocol and delegates like this.

import UIKit

class HomeScreenVCViewController: UIViewController {
    var addButtonDelegate: MainTabBar!
    override func viewDidLoad() {
        super.viewDidLoad()
        addButtonDelegate?.buttonDelegate = self
    }

}

extension HomeScreenVCViewController: AddButtonProtocol {
    func addButtonIsClicked() {
        print("protocol is working") // Not getting called
    }
}

But its not working at all, addButtonIsClicked method is not getting triggered when I tap that round button. Any help will be appreciated.

Upvotes: 2

Views: 302

Answers (3)

ViR
ViR

Reputation: 286

Try this code:

override func viewDidLoad() {
   super.viewDidLoad()
   (tabBarController.tabBar as? MainTabBar)?.buttonDelegate = self
}

Upvotes: 1

Poles
Poles

Reputation: 3682

You did not initialize MainTabBar in HomeScreenVCViewController. Thats why addButtonDelegate is nil

var addButtonDelegate: MainTabBar = MainTabBar()
    override func viewDidLoad() {
        super.viewDidLoad()
        addButtonDelegate?.buttonDelegate = self
    }

Upvotes: 1

Mahendra
Mahendra

Reputation: 8924

Delegate is not getting called b'coz addButtonDelegate is nil. You do not initialise addButtonDelegate so the addButtonDelegate object is nil

Solution

Either you need to make addButtonDelegate as an @IBOutlet or you need to initialise it in viewDidLoad: method.

Then only delegate will be called.

Example 1

@IBOutlet weak var addButtonDelegate: MainTabBar!

and in viewDidLoad

addButtonDelegate.buttonDelegate = self

Example 2

Create property like 

var addButtonDelegate: MainTabBar?

in viewDidLoad initialise addButtonDelegate.

addButtonDelegate = MainTabBar() //or any other initialiser
addButtonDelegate?.buttonDelegate = self

Upvotes: 1

Related Questions