How to change UIBarButtonItem's type in UINaviagationBar at runtime?

Question

Hi, I am working on an iPhone's view which composed 3 elements, UITextView, UIToolBar with an UIBarButtonItem.

The goal is, I want UIBarButtonItem change its style from 'edit' (UIBarButtonSystemItemEdit) to 'Done' (UIBarButtonSystemItemDone) and update new selector to new method.

First of all, I have tried following code but it doesn't work:

Could you help me on this idea?

Answer 1

There is a builtin bar button with this behaviour, you get it via the editButtonItem property of a UIViewContoller. Tabbing that button will change the view controller it came from into editing mode, and toggle the button into a done button.

- (void)viewDidLoad {
  [super viewDidLoad];
  self.navigationItem.rightBarButtonItem = self.editButtonItem;
}

Answer 2

to change the button the Done button use this

[self.navigationItem.rightBarButtonItem setStyle:UIBarButtonItemStyleDone];

to change the button to Edit button use this

[self.navigationItem.rightBarButtonItem setStyle:UIBarButtonItemStyleBordered];