How will the dispatching mechanism change when inheriting an object from the NSObject class?

When inheriting from NSObject in Objective-C or Swift, an object gains access to the dynamic message dispatch mechanism based on the Objective-C runtime. This means that method calls are handled through message sending rather than static binding.

Specifically, when a method is called, the implementation is looked up in the class's method table at runtime, allowing features such as dynamic method addition, overriding, message forwarding, and dynamic method resolution.

If an object does not inherit from NSObject, for example, in pure Swift without NSObject, static dispatch or vtable mechanisms are used, which are less flexible but faster. Therefore, inheriting from NSObject includes the object in the Objective-C runtime's dynamic dispatch system.