initWithBarButtonSystemItem:UIBarButtonSystemItemPageCurl not working

Question

I am creating a barbutton item and adding it to my navigation controller toolbar

UIBarButtonItem *barButtonItem = [[[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemPageCurl target:self action:@selector(pageCurlAction:)] autorelease];

And the barbutton item is rightly loading with the toolbar in my viewcontroller.Now, I push a new viewcontroller into my view and when I pop the viewcontroller, my barbutton item with the page curl shrinks and and the page curl image is missing on the barbutton.

I tried changing the

initWithBarButtonSystemItem

with

UIBarButtonSystemItemPlay, UIBarButtonSystemItemPause, UIBarButtonSystemItemFastForward 

etc. But, it works fine with them. Its just the page curl icon thats not being loaded. Any reasons for this?

Answer 1

From the iOS Human Interface Guidelines:

In addition, you can use the system-provided page curl button in a toolbar (for more information, see the documentation for UIBarButtonSystemItemPageCurl in UIBarButtonItem Class Reference). The page curl button is not available for use in a navigation bar.

(Emphasis added.)

Answer 2

Even if you use a UIToolbar, this problem can appear. It turns out the order in which you do styling and adding of toolbar items matters.

In my case I had to change from:

[self.toolbar setItems:items];
self.toolbar.tintColor = [UIColor grayColor];

to:

self.toolbar.tintColor = [UIColor grayColor];
[self.toolbar setItems:items];

in order for UIBarButtonSystemItemPageCurl to start working on iOS 4.3