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Editorial Team
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Asked: 2026-05-26T06:55:29+00:00

I am using iOS 5 SDK in a project which has iOS 4.0 as

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I am using iOS 5 SDK in a project which has iOS 4.0 as target and I’ve noticed that if I subclass the UINavigationBar class to override the drawRect: method it gets called, but this doesn’t happen when creating a category from UINavigationBar class.

Does anybody knows why is this happening? I should have misunderstood categories or something, because this behavior has no sense to me.

Edit: I’m running the application on iOS 5.

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  1. Editorial Team

    iOS 5.0 SDK Release Notes, UIKit:

    In iOS 5, the UINavigationBar, UIToolbar, and UITabBar implementations have changed so that the drawRect: method is not called unless it is implemented in a subclass. Apps that have re-implemented drawRect: in a category on any of these classes will find that the drawRect: method isn’t called. UIKit does link-checking to keep the method from being called in apps linked before iOS 5 but does not support this design on iOS 5 or later. Apps can either:

    • Use the customization API for bars in iOS 5 and later, which is the preferred way.
    • Subclass UINavigationBar (or the other bar classes) and override drawRect: in the subclass.
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