今天我想讓一個窗體初始運行最大化，本以為很簡單一個問題，花了差不多兩個小時才解決，真是痛苦，
問題一但解決，其實非常簡單
QT 中有一個
void QWidget::setWindowState ( Qt::WindowStateswindowState )
這樣的函數，通過它可以設置窗體的初始狀態，Qt::WindowStates 一共有下面幾種狀態：
| Constant | Value | Description |
|---|---|---|
| Qt::WindowNoState | 0x00000000 | The window has no state set (in normal state). |
| Qt::WindowMinimized | 0x00000001 | The window is minimized (i.e. iconified). |
| Qt::WindowMaximized | 0x00000002 | The window is maximized with a frame around it. |
| Qt::WindowFullScreen | 0x00000004 | The window fills the entire screen without any frame around it. |
| Qt::WindowActive | 0x00000008 | The window is the active window, i.e. it has keyboard focus. |
有了這個就非常easy 了，想讓窗體最大化，只需要
setWindowState(Qt::WindowMaximized);就行了