presenting ViewController with NavigationViewController swift

Question

I have system  NavigationViewController -  MyViewController   and I programmatically want to present MyViewController inside a third view controller  The problem is that I don t have navigation bar in MyViewController after presenting it  Can you help me    var VC1   self storyboard instantiateViewControllerWithIdentifier  MyViewController   as ViewController self presentViewController VC1  animated true  completion  nil

User · Answer

I used an extension to UIViewController and a struct to make sure that my current view is presented from the favourites

1.Struct for a global Bool

struct PresentedFromFavourites {
static var comingFromFav = false}

2.UIVeiwController extension: presented modally as in the second option by "stefandouganhyde - Option 2 " and solving the back

extension UIViewController {
func returnToFavourites()
{
    // you return to the storyboard wanted by changing the name
    let storyBoard : UIStoryboard = UIStoryboard(name: "Main", bundle:nil)
    let mainNavigationController = storyBoard.instantiateViewController(withIdentifier: "HomeNav") as! UINavigationController
    // Set animated to false
    let favViewController = storyBoard.instantiateViewController(withIdentifier: "Favourites")
    self.present(mainNavigationController, animated: false, completion: {
        mainNavigationController.pushViewController(favViewController, animated: false)
    })

}
// call this function in viewDidLoad()
// 
func addBackToFavouritesButton()
{
    if PresentedFromFavourites.comingFromFav
    {
        //Create a button
        // I found this good for most size classes
        let buttonHeight = (self.navigationController?.navigationBar.frame.size.height)! - 15
        let rect = CGRect(x: 2, y: 8, width: buttonHeight, height: buttonHeight)
        let aButton = UIButton(frame: rect)
        // Down a back arrow image from icon8 for free and add it to your image assets  
        aButton.setImage(#imageLiteral(resourceName: "backArrow"), for: .normal)
        aButton.backgroundColor = UIColor.clear
        aButton.addTarget(self, action:#selector(self.returnToFavourites), for: .touchUpInside)
        self.navigationController?.navigationBar.addSubview(aButton)
        PresentedFromFavourites.comingFromFav = false
    }

}}

User · Answer

Calling presentViewController presents the view controller modally  outside the existing navigation stack  it is not contained by your UINavigationController or any other  If you want your new view controller to have a navigation bar  you have two main options   Option 1  Push the new view controller onto your existing navigation stack  rather than presenting it modally   let VC1   self storyboard  instantiateViewControllerWithIdentifier  MyViewController   as  ViewController self navigationController  pushViewController VC1  animated  true    Option 2  Embed your new view controller into a new navigation controller and present the new navigation controller modally   let VC1   self storyboard  instantiateViewControllerWithIdentifier  MyViewController   as  ViewController let navController   UINavigationController rootViewController  VC1     Creating a navigation controller with VC1 at the root of the navigation stack  self present navController  animated true  completion  nil    Bear in mind that this option won t automatically include a  back  button  You ll have to build in a close mechanism yourself   Which one is best for you is a human interface design question  but it s normally clear what makes the most sense

User · Answer

My navigation bar was not showing  so I have used the following method in Swift 2 iOS 9  let viewController   self storyboard  instantiateViewControllerWithIdentifier  Dashboard   as  Dashboard     Creating a navigation controller with viewController at the root of the navigation stack  let navController   UINavigationController rootViewController  viewController  self presentViewController navController  animated true  completion  nil

User · Answer

SWIFT 3  let VC1   self storyboard  instantiateViewController withIdentifier   MyViewController   as  MyViewController let navController   UINavigationController rootViewController  VC1  self present navController  animated true  completion  nil

User · Answer

The accepted answer is great  This is not answer  but just an illustration of the issue    I present a viewController like this    inside vc1    func showVC2         if let navController   self navigationController          navController present vc2  animated  true            inside vc2   func returnFromVC2         if let navController   self navigationController           navController popViewController animated  true       else          print  navigationController is nil    lt -- I was reaching here            As  stefandouganhyde  has said   it is not contained by your UINavigationController or any other   new solution    func returnFromVC2         dismiss animated  true  completion  nil

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