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I'm learning ObjectiveC and ran into a problem relating to introspection. Basically, I'm looping through an array of objects and determining if they accept the lowercaseString selector. If they do, I call that selector on the object. After I ensure that the object responds to that selector, I call it. However, when I do, I get this warning: "warning: 'NSObject; may not respond to '-lowercaseString'" Although the code works fine as written, I'd like to not get the warning. I'm assuming that there's a "right" way to make sure that I don't get that warning (i.e. without just turning warnings off). Any ideas? NSMutableArray *myArray = [[NSMutableArray alloc] init]; [myArray addObject:@"Hello!"]; [myArray addObject:[NSURL URLWithString:@"http://apple.com"]]; [myArray addObject:[NSProcessInfo processInfo]]; [myArray addObject:[NSDictionary dictionary]]; SEL lowercaseSelector = @selector(lowercaseString); for (NSObject *element in myArray) { if ([element respondsToSelector:lowercaseSelector]) { NSLog([element lowercaseString]); // Warning here } }

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