Question

I’m working with MonoTouch and I have come up with three questions around buttons that I’m hoping someone can help me with.

1. I’m trying to change the “Back” button in the title bar. How do I do this? I’ve seen the thread posted here: How to change text on a back button. However, that doesn’t work. I get the vibe that I’m not accessing the controller property. Currently, I receive a NullReferenceException when I attempt to set the button text in the ViewDidLoad method. Currently, I’m trying to set the text like such:

   this.NavigationItem.BackBarButtonItem.Title = “Back”;

   I have the suspicion that I’m not accessing the root controller, but I’m not sure how to do this.

2. For a “back” button on a separate page, I want to perform a custom action. I want it to go back like it does. But before that happens, I want to execute some custom code. How do I do this?

3. I need to create something that looks like a hyperlink within a paragraph of text. How do I do that?

MonoTouch seems cool. However, the learning curve is a bit steeper than I had anticipated. Thank you!

Answer 1

For your first question the MonoTouch-specific answer (to the question you provided) works perfectly.

    this.NavigationItem.BackBarButtonItem = new UIBarButtonItem ("MyBack", UIBarButtonItemStyle.Plain, null);

Make sure to the all the answers. This code needs to be called in the pushing controller, not the controller being pushed.

UPDATE

For your second question you likely noticed a few overloads that takes a Selector or a delegate. However they won’t work for a Back button.

One way to work around this iOS limitation is to override ViewDidAppear or ViewDidDisappear to get similar notification.