How to Create Back Button in Navigation Bar

how to create back button in navigation bar

As you said in your comment you use a modal controller

Add the following in viewWillappear

     UIBarButtonItem *backButton = [[UIBarButtonItem alloc] initWithTitle:@"Back" style: UIBarButtonItemStyleBordered target:self action:@selector(Back)];
     self.navigationItem.leftBarButtonItem = backButton;

And in

- (IBAction)Back
  {
    [self dismissViewControllerAnimated:YES completion:nil]; // ios 6
  }

Custom back button for NavigationView's navigation bar in SwiftUI

TL;DR

Use this to transition to your view:

NavigationLink(destination: SampleDetails()) {}

Add this to the view itself:

@Environment(\.presentationMode) var presentationMode: Binding<PresentationMode>

Then, in a button action or something, dismiss the view:

presentationMode.wrappedValue.dismiss()

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Full code

From a parent, navigate using NavigationLink

 NavigationLink(destination: SampleDetails()) {}

In DetailsView hide navigationBarBackButton and set custom back button to leading navigationBarItem,

struct SampleDetails: View {
    @Environment(\.presentationMode) var presentationMode: Binding<PresentationMode>

    var btnBack : some View { Button(action: {
        self.presentationMode.wrappedValue.dismiss()
        }) {
            HStack {
            Image("ic_back") // set image here
                .aspectRatio(contentMode: .fit)
                .foregroundColor(.white)
                Text("Go back")
            }
        }
    }
    
    var body: some View {
            List {
                Text("sample code")
        }
        .navigationBarBackButtonHidden(true)
        .navigationBarItems(leading: btnBack)
    }
}

How to create Navigation bar with back button on it?

Xcode handles this for you.

Highlight your first controller. Go to the menu bar and click Embed In > Navigation Controller. Now using UIButton or something, control-click and drag from your first view controller's button to your second view controller and make it a Push segue. The back button won't appear, but if you run it, it will be there.

So you should have 3 views in storyboard. The Navigation Controller, your first view controller, and your second view controller.

Here is one way to do it using code.

Swift custom back button in navigation bar

Try code below :-)

func SetBackBarButtonCustom()
{
    //Back buttion
    let btnLeftMenu: UIButton = UIButton()
    btnLeftMenu.setImage(UIImage(named: "back_arrow"), for: UIControlState())
    btnLeftMenu.addTarget(self, action: #selector(UIViewController.onClcikBack), for: UIControlEvents.touchUpInside)
    btnLeftMenu.frame = CGRect(x: 0, y: 0, width: 33/2, height: 27/2)
    let barButton = UIBarButtonItem(customView: btnLeftMenu)
    self.navigationItem.leftBarButtonItem = barButton
}

func onClcikBack()
{
    _ = self.navigationController?.popViewController(animated: true)
}

How to properly implement the top back button in navigation drawer?

if (item.getItemId() == android.R.id.home) {
    int backStackCount = fragmentManager.getBackStackEntryCount();//check currently how many frags loaded
    if (backStackCount > 0) {
        fragmentManager.popBackStack(); //go back to previously loaded fragment
    }   
}

Currently, clicking back only exits the app.

Using popBackStack() will pop up the backstack making your app exists, but you just need to return to the default fragment.

To fix this, you need to change the behavior of the drawer burger button, so that it can be used sometimes to open the drawer navView layout, and other times to back to the default fragment; the later is when you want to add the top back button instead.

how I can implement the up/top back button for the nav drawer

This requires to access the setToolbarNavigationClickListener method which enables you add a listener to burger clicks.

In this case you need to return back to the home fragment as you need, in the onCreate() method add:

toggle.setToolbarNavigationClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        // Enable the functionality of opening the side drawer, when the burger icon is clicked
        toggle.setDrawerIndicatorEnabled(true); // Show the burger icon & enable the drawer funcionality
        navController.navigate(R.id.home); // Back to default fragment (replace home with your default fragment id in the navGraph)
    }
});

The remaining part is to show the back button whenever you want to go to certain fragment

And use toggle.setDrawerIndicatorEnabled() to enable/disable the functionality of opening/closing the drawer when the home/burger icon is clicked

navController.addOnDestinationChangedListener(new NavController.OnDestinationChangedListener() {
    @Override
    public void onDestinationChanged(@NonNull NavController controller, @NonNull NavDestination destination, @Nullable Bundle arguments) {

        // Repeat this condition for all the Fragments that you want to show the back button
        if (destination.getId() == R.id.settings_id) { // replace `settings_id` with your fragment id in the navGraph that you want to show the back button
            // Disable the functionality of opening the side drawer, when the burger icon is clicked & show the UP button instead
            toggle.setDrawerIndicatorEnabled(false);

        } 

    }
});

Swift Custom NavBar Back Button Image and Text

You can do something like that:

let yourBackImage = UIImage(named: "back_button_image")
self.navigationController?.navigationBar.backIndicatorImage = yourBackImage
self.navigationController?.navigationBar.backIndicatorTransitionMaskImage = yourBackImage
self.navigationController?.navigationBar.backItem?.title = "Custom"

Your image will only have one color though

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