今天我想让一个窗体初始运行最大化，本以为很简单一个问题，花了差不多两个小时才解决，真是痛苦，
问题一但解决，其实非常简单
QT 中有一个
void QWidget::setWindowState ( Qt::WindowStateswindowState )
这样的函数，通过它可以设置窗体的初始状态，Qt::WindowStates 一共有下面几种状态：
| 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. |
有了这个就非常easy 了，想让窗体最大化，只需要
setWindowState(Qt::WindowMaximized);
就行了