Question 67862 in IOS Swift Question posted in
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How to open alertcontroller after pressed TabBar? – Ios swift

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import UIKit

class TabBarController: UITabBarController, UITabBarControllerDelegate {

    override func viewDidLoad() {
        super.viewDidLoad()
        view.backgroundColor = .white
        self.delegate = self
        
        let vc1 = UINavigationController(rootViewController: VideoListVC())
        let vc2 = UINavigationController(rootViewController: AddViewController())
        let vc3 = UINavigationController(rootViewController: FabricViewController())
        
        
        
        vc1.tabBarItem.image = UIImage(systemName: "house")
        vc2.tabBarItem.image = UIImage(systemName: "qrcode")
        vc3.tabBarItem.image = UIImage(systemName: "house")
        
        
        
        //tabBar.tintColor = .label
        
        setViewControllers([vc1, vc2, vc3], animated: true)
        
        
        func tabBarController(_ tabBarController: UITabBarController, didSelect viewController: UITabBarController) {
                if viewController is AddViewController {
                    print("Alert is opened")
                
            }
       

    }

I can’t open alertcontroller because my TabBarController is rootcontroller. How can i fix it ?

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3

Answers


  1. 0

    self.show(alertController, sender: self)

    This should work as UITabbarController is a subclass of UIViewController

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  2. 0

    the didSelect method is wrong , replace with :

    func tabBarController(_ tabBarController: UITabBarController, didSelect viewController: UIViewController) {
        if viewController is AddViewController {
            print("put code for showing alert")
        }
    }
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  3. 0

    Just cross check you delegate function with the below code

       func tabBarController(_ tabBarController: UITabBarController, didSelect viewController: UIViewController) {
        if let vc = viewController as? UINavigationController, vc.topViewController! is AddViewController {
            let alert = UIAlertController(title: "Alert", message: "Message", preferredStyle: .alert)
            alert.addAction(UIAlertAction(title: "Ok", style: .default))
            self.present(alert, animated: true)
        }
    }

    Since you are adding UINavigationController to the UITabBarController, so first you need to check for that inside the delegate function and then check for the rooviewcontroller of the UINavigationController.

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