swift VS NSObject

Any class that does not inherit from another class is known as a base class.

Swift classes do not inherit from a universal base class. Classes you define without specifying a superclass automatically become base classes for you to build upon.

According to the language reference, there is no requirement for classes to subclass any standard root class, so you can include or omit a superclass as needed.

Note that omitting a superclass from the class declaration, doesn't assign a implicit base superclass of any kind. It defines a base class, which will effectively become the root for an independent class hierarchy.

From the language reference:

Swift classes do not inherit from a universal base class. Classes you define without specifying a superclass automatically become base classes for you to build upon.

Trying to reference super from a class without a super class (i.e. a base class) will result in a compile time error

'super' members cannot be referenced in a root class

https://stackoverflow.com/questions/24057525/swift-native-base-class-or-nsobject

https://docs.swift.org/swift-book/LanguageGuide/Inheritance.html

swift中，一个对象可以不继承自NSObject
－继续自NSObject 可以使用KVC方法给属性设置数值＝》如果是模型对象，最好还是使用NSObject
－如果对象，没有属性，或者不依赖KVC , 可以建立一个没有父类的对象！，对象的量级比较轻，加载时，就在内存创建
什么，内存消耗小

https://blog.csdn.net/hsf_study/article/details/49357225