iOS在当前ViewController中设置BackButton

Question

How can I change the Back-Button of the currently displayed ViewController? Configuring the BackButtonItem effects the BackButton of the next ViewController, instead of the currently shown.

eg: I have two ViewControllers VCA and VCB. I navigate from VCA to VCB and want to style the BackButton thats shown on VCB. I want to hide the title and set custom icons for normal and highlighted state.

public class VCB : ViewControllerBase
{
    public override void ViewDidLoad()
    {
        base.ViewDidLoad();

        var btn = new UIBarButtonItem("", UIBarButtonItemStyle.Plain, null);
        // TODO: set the Icon
        NavigationItem.BackBarButtonItem = btn;
    }
}

Do I have to implement my own BackButton and set it as LeftBarButton, or can I achieve this somehow with the standard BackButton .

Answer 1

如果BarButtonItem在视图中已经有BarButtonItem ，则应该可以使用this.NavigationItem.BackBarButtonItem并更改其属性。

Answer 2

You can try this in your ViewDidLoad method:

UIBarButtonItem backButton = new UIBarButtonItem("< Back",UIBarButtonItemStyle.Plain, null);
this.NavigationItem.SetLeftBarButtonItem(backButton, false);