设置自定义NavigationBar后，Segue无法正常工作

Question

I am performing a segue from my loadVC to containterVC in which I set up a navigationController and set it's rootViewController to mainVC

Code in viewDidLoad in containterVC:

override func viewDidLoad() {
    super.viewDidLoad()
    mainVC = UIStoryboard.mainVC()  //This is an extension to UIStoryboard
    //Setting up the delegate:
    mainVC.delegate = self




    //rootViewController - ten najbardziej na dole
    myNavigationController = UINavigationController(rootViewController: mainVC)
    //Storing the root view as currentViewController:
    self.currentViewController = mainVC
    myNavigationController.addChildViewController(mainVC)
    self.view.addSubview(myNavigationController.view)
    addChildViewController(myNavigationController)
    myNavigationController.didMoveToParentViewController(self)


    //Trying to set up the navigation bar
    let bar = myNavigationController.navigationBar
    //Navigation bars:
    bar.barTintColor = UIColor.blackColor()
    bar.tintColor = UIColor.whiteColor()
    bar.translucent = false
}

I launch the project. And? Everything works properly.

Then I try to add these under "bar.translucent = false" line:

    print("statement1")
    let menuButton = UIBarButtonItem(title: "Menu", style: UIBarButtonItemStyle.Plain, target: self, action: "")
    print("statement2")
    let item = myNavigationController.navigationItem
    print("statement3")
    item.leftBarButtonItem = menuButton
    print("statement4")
    bar.items = [item]
    print("statement5")

After launching the project print statements up to 4 are displayed and the 5th is not. So it seems that the segue between loadVC and containterVC is done, but I don't see the mainVC screen that was set up as a rootViewController.

When I delete "bar.items = [item]" line the project is run as it should be, but there is no "Menu" button in the navigation bar.

What am I doing wrong?

Answer 1

You can just use a "container view" from the storyboard and embed a UINavigationController with your mainVC directly within the storyboard.

Anyway i think that myNavigationController.addChildViewController(mainVC) not necessary.

Also the bar items should be set to the mainVC's navigationItem, not the navigationController's one.

Also you did not mention what kind of segue are you using.