ViewStack、TabNavigator
ViewStack是由若干个重合在一起的子容器组成的。但是每次只有一个子容器是可见的。ViewStack不提供可视化的操作来切换它的子容器,但是我们可以通过selectedChild来实现。TabNavigator和viewStack基本相同,只不过它多了一个可视化的标签条来切换内部的子容器。
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