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@interface Fraction: NSObject {
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When wouldn’t NSObject be used and is NSObject the ultimate parent class for all other classes?
Please feel free to correct me on any wrong terminology used.
If I was writing a subclass of NSView, I would write:
because my class is inheriting from NSView. Classes in Objective-C inherit from only a single parent class. As you work your way up the chain from NSView (to its parent class, NSResponder), you would find that it eventually inherits from NSObject.
I’m not sure about the second part of your question. I think all classes in Apple’s Cocoa Frameworks eventually inherit from NSObject, but don’t quote me on that. There’s no reason, in Objective-C, why there couldn’t be other root objects (otherwise Objective-C would only be used on Apple systems). However, in Cocoa, NSObject is the root.