Setting back button when presenting a view controller

Question

On clicking a button I display a view controller using the following code:

let navController = UINavigationController(rootViewController: locationVC)
navController.navigationBar.barTintColor = StyleHelper.navBarColor()
navController.navigationBar.tintColor = UIColor.whiteColor()               
navController.navigationItem.backBarButtonItem = UIBarButtonItem(image: UIImage(named: "back_arrow"), style: .Plain, target: locationVC, action: nil)
self.presentViewController(navController, animated: true, completion: nil)

But the back button does not appear on the locationVC

What am I doing wrong? Please help

Answer 1

Multiple issues with code.

Issue 1:

You should update viewController's bar button item and not navigationController's bar button item.

So this is wrong

navController.navigationItem.backBarButtonItem

Whats correct

self.navigationItem.backBarButtonItem

Issue 2:

The above code won't work because your current viewController is not pushed by any other VC so it cant show back button. What you need is leftBarButtonItem

So in your VC you can write

override func viewDidLoad() {
    super.viewDidLoad()
    self.navigationItem.leftBarButtonItem = UIBarButtonItem(title: "Abcd", style: .done, target: self, action: yourSelectorHere)
}

O/P: