The sample application at this point has one big problem: even though the label of the button changes, the action that occurs when you click that button does not.
现在这个示例应用程序有一个大问题：虽然按钮的标签改变了，但是单击按钮时的动作没有变。
The sample application at this point has one big problem: even though the label of the button changes, the action that occurs when you click that button does not.
现在这个示例应用程序有一个大问题：虽然按钮的标签改变了，但是单击按钮时的动作没有变。
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