Open Radar

 
Summary:
Disabling a toolbar's UIBarButtonItem as a result of a user choice in an UIActionSheet doesn't "visually" disable the button if the button is of type Plain. The button is not clickable (as expected), but still appears enabled.

A sample Xcode project demonstrating the issue is attached. It contains an empty view with a toolbar containing a button (with a trash icon). Pressing the toolbar button opens an action sheet, with an action that disables the toolbar button. Choosing this action demonstrates the problem: the button isn't grayed out like it should be.
There is also a button in the view toggling the button's "enabled" property to show that it works properly outside of an action sheet.

https://dl.dropboxusercontent.com/u/3659886/ActionSheetBug.zip

Steps to Reproduce:
Make a view with a toolbar containing an UIBarButtonItem.
Set the bar button item's type to Plain.
Make the button open an action sheet, and in actionSheet:clickedButtonAtIndex: delegate method, set the button's "enabled" property to NO.

Expected Results:
When the action sheet's button is pressed, the action sheet should be dismissed and the button should be disabled and appear grayed out.

Actual Results:
The button doesn't appear grayed out. Note: the button is actually disabled, tapping it doesn't do anything (not even highlight it). But it still appears enabled (white icone instead of gray)

Regression:
The problem happens in iOS 6.0 and higher. It is not occurring on iOS 5.

Notes:
This doesn't happen with a button of type Bordered.