UIScrollView's origin changes after popping back to the UIViewController

override func viewWillAppear(_ animated: Bool) {

        

        self.Scrollview.contentOffset = CGPoint(x: 0,y :0)

    }

how to Scroll(horizontally) in collection view on button press?

https://stackoverflow.com/questions/34024031/how-to-scrollhorizontally-in-collection-view-on-button-press

How to Apply Gradient to background view of iOS Swift App

https://stackoverflow.com/questions/24380535/how-to-apply-gradient-to-background-view-of-ios-swift-app

Create UIWebView Programmatically and Load Webpage Using NSURL

1. class ViewController: UIViewController, UIWebViewDelegate {
3. override func viewDidLoad() {
4. super.viewDidLoad()
5. // Do any additional setup after loading the view, typically from a nib.
7. let myWebView:UIWebView = UIWebView(frame: CGRect(x:0, y:0, width: UIScreen.main.bounds.width, height:UIScreen.main.bounds.height))
9. self.view.addSubview(myWebView)
11. myWebView.delegate = self
13. //1. Load web site into my web view
14. let myURL = URL(string: "http://www.swiftdeveloperblog.com")
15. let myURLRequest:URLRequest = URLRequest(url: myURL!)
16. myWebView.loadRequest(myURLRequest)
18. }

How to check if a file exists in Documents folder?

let documentsURL = try! FileManager().url(for: .documentDirectory,
                                          in: .userDomainMask,
                                          appropriateFor: nil,
                                          create: true) 
let fooURL = documentsURL.appendingPathComponent("foo.html")
let fileExists = FileManager().fileExists(atPath: fooURL.path)
if fileExists==true
{
print("already existed")
}
else
{
print("no file")
}

https://stackoverflow.com/questions/1638834/how-to-check-if-a-file-exists-in-documents-folder

Enable zooming/pinch on UIWebView

1)you can use webView.scalesPageToFit=YES; programmatically

2)If you are using in xib than just click the check box "Scaling" scales Page to fit

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