Nsobject
NSObject is the root class of most Objective-C class hierarchies; it has no superclass
Nsstring
NSString is the plain-text character-string class in Cocoa and Cocoa Touch
Others
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Nsstring has a higher level it also inherited form nsobject const on it should have no effect in fact not the same meaning about the no effect on immutable object from question What is a better practice when defining a const NSString object in objective-c? |