Select Tab bar controller in the MainWindow component window.
在MainWindow组件窗口中选择Tabbarcontroller。
The next step has created a Canvas widget and had it fill the entire MainWindow.
下一步是创建画布部件并使之充满整个主窗口。
Next, we've created Label and Button objects as child widgets inside the MainWindow.
下一步，我们将在这个主窗口中创建标签和按钮对象，作为主窗口的子部件。
Each widget (except for top-level ones, such as MainWindow) must be the child of exactly one parent.
每个部件(除了顶层部件外，比如主窗口)必须是某个确切父部件的子部件。
Each widget (except for top-level ones, such as MainWindow) must be the child of exactly one parent.
每个部件(除了顶层部件外，比如主窗口)必须是某个确切父部件的子部件。
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