Mar
27
Day 29: -containsObjectOfClass:
Today I’ll be going back to the very beginning of 365Cocoa with a category on NSArray. I do find that I often need to see if an array contains objects of a certain class. One use is in validating menu and toolbar items for example; based on the layers you might have selected you want to enable/disable some items. This method takes perfect care of that:
- (BOOL)containsObjectOfClass:(Class)aClass
{
for (id obj in self) {
if ([obj isKindOfClass:aClass])
return YES;
}
return NO;
}