How does Objective C on the iPhone compare to Objective C on the Mac and what version of objective C is the various iPhone versions?
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How does Objective C on the iPhone compare to Objective C on the Mac and what version of objective C is the various iPhone versions?
iPhone OS debuted shortly before Leopard, and it has been Objective-C 2.0 from the get-go. Aside from the lack of Garbage Collection on iPhone, the key difference is that the Objective-C runtime on iPhone is always Modern Runtime, as opposed to the Legacy Runtime for 32-bit Mac apps. (See this Apple doc.) One of the important results of this distinction is that instance variables are non-fragile (meaning that when you change the instance variables of a class, you don’t have to recompile its subclasses) and it can synthesize variables for properties.