reflection - Create objective-c class instance by name? -

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Is it possible to make an example of a square based on the name? Something like this: 

  NSString * className = @ "car"; Id * p = [create magic class: name: className]; [P turnOnEngine];

I do not know that this is possible in Objective-C, but it seems that it will, 

  ID object = [[NSClassFromString (@" NameofClass ") alloc] init];

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