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Re: troubleshooting unrecognised selector messages

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Re: troubleshooting unrecognised selector messages

Subject: Re: troubleshooting unrecognised selector messages
From: Thomas Engelmeier <email@hidden>
Date: Mon, 12 Nov 2007 09:58:10 +0100


On 07.11.2007, at 22:21, Andrew Ebling wrote:

2007-11-07 21:15:35.692 RaiseMan[543:10b] *** -[NSCFNumber <null selector>]: unrecognized selector sent to instance 0x110e50

Any ideas how to go about troubleshooting these sorts of messages? I tried poking around with gdb on the command line to see if I could find out what was sitting at the supplied address, without success.

The easiest way to debug such behavior is to provide the unrecognized method in a category and set a breakpoint there. A little more effort is to add a category for - (void)doesNotRecognizeSelector:(SEL)aSelector, either for the concretete class that throws or up in the class hierachy to NSObject.

Just make sure either version is not present in release builds.

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