Tap tab bar to scroll to top of UITableViewController

Question

Tapping the tab bar icon for the current navigation controller already returns the user to the root view, but if they are scrolled way down, if they tap it again I want it t

Answer 1

SWIFT 3

Here goes..

First implement the UITabBarControllerDelegate in the class and make sure the delegate is set in viewDidLoad

class DesignStoryStreamVC: UIViewController, UICollectionViewDelegate, UICollectionViewDataSource, UITabBarControllerDelegate {

 @IBOutlet weak var collectionView: UICollectionView!

 override func viewDidLoad() {
        super.viewDidLoad()

        self.tabBarController?.delegate = self

        collectionView.delegate = self
        collectionView.dataSource = self
    }
}

Next, put this delegate function somewhere in your class.

func tabBarController(_ tabBarController: UITabBarController, didSelect viewController: UIViewController) {

    let tabBarIndex = tabBarController.selectedIndex

    print(tabBarIndex)

    if tabBarIndex == 0 {
        self.collectionView.setContentOffset(CGPoint.zero, animated: true)
    }
}

Make sure to select the correct index in the "if" statement. I included the print function so you can double check.