Adding left barbutton on navigation controller

Question

I am trying to add the left bar button in navigation controller but it is not working. My code:

this.NavigationController.NavigationBar.TintColor = UIColor.White;
        this.NavigationController.NavigationBar.BarTintColor = UIColor.FromRGBA(204,165,99,255);
        this.NavigationController.NavigationItem.SetLeftBarButtonItem(
            new UIBarButtonItem(UIImage.FromFile("hamburger_menu")
            , UIBarButtonItemStyle.Plain
            , (sender, args) => {
                // button was clicked
            })
        , true);

        this.Title = "Dashboard";

I used code from this url. hamburger_menu is an image present in my Assets.

Answer 1

If you want to add the left bar button to a particular UIViewController. We shouldn't set its NavigationController's NavigationItem.

Be aware of that every UIViewController has a NavigationItem property. Set its own NavigationItem to achieve your effect:

this.NavigationItem.SetLeftBarButtonItem(
    new UIBarButtonItem(UIImage.FromBundle("hamburger_menu")
    , UIBarButtonItemStyle.Plain
    , (sender, args) => {
    // button was clicked
})
, true);

Moreover because UINavigationController is a subClass of UIViewController, you can set its NavigationItem. But this item is not what you want.

Answer 2

我正在使用UIImage.FromFile读取图像，但是当我将其更改为UIImage.FromBundle时，它开始工作。