Only visible ViewControllers can be seen.
只能看到可见的ViewController。
Using ValidationRule keeps validation processing separate from the data model and ViewControllers.
使用ValidationRule使验证处理同数据模型和ViewController分隔开。
ViewControllers can be implemented in two ways: through inheritance or through delegation. Both are shown here.
有两种方法可以实现ViewController：通过继承或通过委托。
The separation of functions increases the reusability of ViewControllers and ApplicationMediators, since they have no placement-related function of their own.
功能的分离提高了 ViewController和ApplicationMediator的可重用性，因为它们本身没有与布局相关的功能。
The separation of functions increases the reusability of ViewControllers and ApplicationMediators, since they have no placement-related function of their own.
功能的分离提高了 ViewController和ApplicationMediator的可重用性，因为它们本身没有与布局相关的功能。
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