Accessors reduce the risk of the fragile base class problem where changes in a superclass ripple throughout its subclasses.
读写方法减少了超类中的更改影响到其子类的这种脆弱的基类问题所带来的风险。
Last, we extend the setters to call into the functions of the base class to propagate notification of property changes.
最后，我们扩展setters以调用基类的函数，从而传递属性变更通知。
This class provides a convenient base class for developers who want to make only minor changes to controller creation.
此类提供一个方便的基类，方便开发人员对控制器创建进行小的更改。
This class provides a convenient base class for developers who want to make only minor changes to controller creation.
此类提供一个方便的基类，方便开发人员对控制器创建进行小的更改。
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