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POHow to use UIAppearance to style a subclass but not the superclass?
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  1. POHow to use UIAppearance to style a subclass but not the superclass?
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    copied!<p>I'm styling my UINavigationBar with <a href="http://developer.apple.com/library/ios/#documentation/uikit/reference/UIAppearance_Protocol/Reference/Reference.html" rel="nofollow noreferrer">UIAppearance</a>. I want all the back buttons to have <strong>gray</strong> text and all my rightBarButtonItems to have <strong>green</strong> text (colors are hypothetical). Since both buttons are UIBarButtonItems by default, UIAppearance would not be able to differentiate the two. So I decided to subclass a UIBarButtonItem, calling it ActionBarButtonItem. I use this new subclass anywhere I need a rightBarButtonItem.</p> <h2>rightBarButtonItem</h2> <pre><code>UIBarButtonItem* done = [[ActionBarButtonItem alloc] initWithTitle:@"Done" style:UIBarButtonItemStyleDone target:self action:@selector(onDonePress)]; self.navigationItem.rightBarButtonItem = done; [done release]; </code></pre> <h2>UIAppearance</h2> <pre><code>NSDictionary* buttonStyle = [NSDictionary dictionaryWithObjects:[NSArray arrayWithObjects: [UIColor grayColor], , nil ] forKeys:[NSArray arrayWithObjects: UITextAttributeTextColor, nil ] ]; NSDictionary* actionStyle = [NSDictionary dictionaryWithObjects:[NSArray arrayWithObjects: [UIColor greenColor], nil ] forKeys:[NSArray arrayWithObjects: UITextAttributeTextColor, nil ] ]; [[UIBarButtonItem appearanceWhenContainedIn:[UINavigationController class], nil] setTitleTextAttributes:buttonStyle forState:UIControlStateNormal ]; [[ActionBarButtonItem appearanceWhenContainedIn:[UINavigationController class], nil] setTitleTextAttributes:actionStyle forState:UIControlStateNormal ]; </code></pre> <p>Theoretically, the gray text would be applied for all UIBarButtonItems. Then I override that gray text with green text for ActionBarButtonItems only. The final result is not as expected. For unknown reasons, <em>every</em> UIBarButtonItem gets green text. Why?</p> <p><img src="https://i.stack.imgur.com/2Lc10.png" alt="enter image description here"><img src="https://i.stack.imgur.com/m0oZA.png" alt="enter image description here"></p>
 

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