Home/ Questions/Q 6191583
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-05-24T02:47:31+00:00

I’m writing a logger class (who doesn’t ?) with a method – (void) logWithTag:(NSString

  • 0

I’m writing a logger class (who doesn’t ?) with a method 

- (void) logWithTag:(NSString *)aTag andMessage:(NSString *)aMsg;

I wish to be able to forward undefined messages to this method. For example : 

[myLogger logFoo:@"bar"] should call [myLogger logWithTag:@"Foo" andMessage:@"bar"]

and more generically 

[myLogger logXXX:@"bar"] should call [myLogger logWithTag:@"XXX" andMessage:@"bar"]

I’ve looked at resolveInstanceMethod and message forwarding, but from what I understood, they all expect the method to have the same signature.

Any idea ?
thanks !

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    Apple covers this in the Objective-C Runtime Programming Guide. Basically you need to override respondsToSelector: and return YES if you would like to support the method. Then also override forwardInvocation: and then capture the selector string, remove the log prefix, and create a new NSInvocation that will call logWithTag:andMessage:

    • 0