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Editorial Team
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Asked: 2026-05-26T15:08:34+00:00

I’m consistently running into an invalid selector exception when I attempt to set multiple

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I’m consistently running into an invalid selector exception when I attempt to set multiple UIBarButtonItems in MonoTouch.

In the simulator, there are no issues at all. Each button I add works correctly. Only when I deploy to a test device (iPhone 3G with iOS 4.2.1 installed) does it throw this error:

-[UINavigationItem setRightBarButtonItems:animated:]: unrecognized selector sent to instance 0xef7af0

I have tried using the RightBarButtonItems property and the explicit SetRightBarButtonItems method, passing a UIBarButtonItem[] instance in each case.

Maybe the way to get around this is to use a ToolBar with a custom view, but I’d rather just use the API as advertised, especially if it works correctly in the simulator.

Anyone run into this?

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1 Answer

  1. Editorial Team

    I assume you’re using MonoTouch 5.0 and the latest iOS SDK (5) and Xcode 4.2.

    The setRightBarButtonItems:animated: selector is new in iOS5. This means it will work in the simulator, which likely defaults to 5.0. However this won’t work in older releases of iOS (e.g. like 4.2.1).

    At this stage you have two choices:

    • avoid iOS5 features; or

    • detect, at runtime, which version of iOS is being used and adjust your application to what’s available.

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