Go to rootView when tabBar tapped

import UIKit

class RootviewTabViewController: UITabBarController {

    override func viewDidLoad() {

        super.viewDidLoad()

        // Do any additional setup after loading the view.

    }

    

    override func tabBar(_ tabBar: UITabBar, didSelect item: UITabBarItem) {

        let rootView = self.viewControllers![self.selectedIndex] as! UINavigationController

        rootView.popToRootViewController(animated: false)

    }

    override func didReceiveMemoryWarning() {

        super.didReceiveMemoryWarning()

        // Dispose of any resources that can be recreated.

    }

    

  

}

How to dismiss number keyboard after tapping outside of the textfield

viewdidload()
{

let tapRecognizer = UITapGestureRecognizer()
tapRecognizer.addTarget(self, action: #selector(ViewController.didTapView))
self.view.addGestureRecognizer(tapRecognizer)

}

func didTapView(){
  self.view.endEditing(true)
}

How to center align the cells of a UICollectionView?

https://stackoverflow.com/questions/13588283/how-to-center-align-the-cells-of-a-uicollectionview

Hiding the tabbar and removing the space

https://stackoverflow.com/questions/37040313/hiding-the-tabbar-and-removing-the-space/37108450

Swift iOS TableView cell items disappears when scrolling

https://stackoverflow.com/questions/44341768/when-calling-prepareforreuse-in-customtableviewcell-swift-uitableviewcells-be

Execute action when back bar button of UINavigationController is pressed

https://stackoverflow.com/questions/27713747/execute-action-when-back-bar-button-of-uinavigationcontroller-is-pressed

self.navigationItem.hidesBackButton = true

        let newBackButton = UIBarButtonItem(title: "Back", style: UIBarButtonItemStyle.plain, target: self, action: #selector(Quoterequestsend.back(sender:)))

        self.navigationItem.leftBarButtonItem = newBackButton

  func back(sender: UIBarButtonItem) {

        

        let storyBoard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)

        

        let vc = storyBoard.instantiateViewController(withIdentifier: "viewcontroller") as! viewcontroller

        

        self.navigationController?.pushViewController(vc, animated: true)

    }

Scrollview and keyboard Swift

@IBOutlet weak var scrollView: UIScrollView!

viewdidload()
{

NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillShow), name:NSNotification.Name.UIKeyboardWillShow, object: nil)

        NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillHide), name:NSNotification.Name.UIKeyboardWillHide, object: nil)

}

 func keyboardWillShow(notification:NSNotification){

        //give room at the bottom of the scroll view, so it doesn't cover up anything the user needs to tap

        var userInfo = notification.userInfo!

        var keyboardFrame:CGRect = (userInfo[UIKeyboardFrameBeginUserInfoKey] as! NSValue).cgRectValue

        keyboardFrame = self.view.convert(keyboardFrame, from: nil)

        

        var contentInset:UIEdgeInsets = self.scrollView.contentInset

        contentInset.bottom = keyboardFrame.size.height

        self.scrollView.contentInset = contentInset

    }

    

    func keyboardWillHide(notification:NSNotification){

        let contentInset:UIEdgeInsets = UIEdgeInsets.zero

        self.scrollView.contentInset = contentInset

    }

    

    func textFieldShouldReturn(_ textField: UITextField) -> Bool {

        self.view.endEditing(true)

        return false

    }

textfield should be delegate if we want to work with return key function