Qt动态加载ui界面

QString strPath = QCoreApplication::applicationDirPath() + "/ui/MainWindows.ui";

    QFile mainWinFile(strPath);

    if(!mainWinFile.exists()) return;

    QUiLoader loader;

    mainWinFile.open(QFile::ReadOnly);

    loader.addPluginPath(QCoreApplication::applicationDirPath());

    MainWindows = loader.load(&mainWinFile);

    mainWinFile.close();

    MainWindows->setWindowFlag(Qt::FramelessWindowHint);

    MainWindows->setParent(this);

    MainWindows->show();

    setWindowFlags(windowFlags()& ~Qt::WindowMaximizeButtonHint);

    setFixedSize(MainWindows->width(),MainWindows->height());