Open Radar

 
Summary:

Using UIAppearance proxy with UIBarButtonItem subclasses is causing an unrecognized selector being sent to UINavigationButton.

Steps to Reproduce:

1. Create a simple app with UINavigationController with one child view controller
2. Create a new subclass of UIBarButtonItem
3. Create a new property tagged with UI_APPEARANCE_SELECTOR
4. Set this property using appearance proxy in e.g. App Delegate
5. In your view controller set self.navigationItem.rightBarButtonItem = <your button>;
6. Run the application

Alternatively, you can open my attached demo project and run it.

Expected Results:

The property is being set correctly by UIAppearance.

Actual Results:

An "unrecognized selector sent to instance" exception (NSInvalidArgumentException) is raised, sending a property setter message to UINavigationButton

Regression:

This behavior may be caused because of UIBarButtonItem inheritance. UIBarButtonItem inherits from NSObject, not UIView and it uses a custom appearance class (_UIBarButtonAppearance). Its forwardInvocation: method may be forwarding the property setter to UINavigationButton, not the UIBarButtonItem itself.

Notes:

This behavior is present only if you initialize your UIBarButtonItem subclass with all methods except initWithCustomView:, because initWithCustomView: does not create a UINavigationButton.

--- 13-Aug-2013 02:16 PM

'UIBarButtonItem Subclass Demo.zip' was successfully uploaded