NSLog(@"%@",[NSProxy class]);
NSLog(@"%@",[NSProxy class]);
- Subject: NSLog(@"%@",[NSProxy class]);
- From: Agent M <email@hidden>
- Date: Sat, 11 Mar 2006 15:08:19 -0500
I have come across a difficulty with an NSProxy subclass on 10.3.9
which can be summed up with the following lines:
Class p=[NSProxy class];
NSLog(@"class %@",p);
The second line throws an exception:
*** Uncaught exception: <NSInvalidArgumentException> *** -[NSProxy
methodSignatureForSelector:] called!
If "NSProxy" above is any NSObject subclass, then it prints the class
name as expected.
The reason this occurs is because +[NSProxy class] does not implement
the proper description method. Apparently, not all meta-classes are
created equal.
-----
Workarounds are:
1) NSLog(@"class %@",NSStringFromClass([NSProxy class]));
or
2)
@implementation NSProxy (Desc)
+(NSString*)_copyDescription //yes, this is a private method
{
return [NSStringFromClass([self class]) copy]; //extra retain
increment is critical here
}
@end
I found solution (2) by adding a category on NSProxy:
-(NSMethodSignature*)methodSignatureForSelector:(SEL)sel
{
NSLog(@"selector! %@",NSStringFromSelector(sel));
return nil;
}
Because NSProxy is a stripped down root object, perhaps this is how
things are supposed to behave; but I hope this will help anyone who
comes across this in the future.
¬ ¬ ¬ ¬ ¬ ¬ ¬ ¬ ¬ ¬ ¬ ¬ ¬ ¬ ¬ ¬ ¬ ¬
AgentM
email@hidden
¬ ¬ ¬ ¬ ¬ ¬ ¬ ¬ ¬ ¬ ¬ ¬ ¬ ¬ ¬ ¬ ¬ ¬
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