默认对话框

Qt::WindowFlags flags=Qt::Dialog;
    flags|=Qt::WindowMinimizeButtonHint;
    flags|=Qt::WindowMaximizeButtonHint;
    flags|= Qt::WindowCloseButtonHint;
    setWindowFlags(ture);

自定义

QToolButton* closeButton = new QToolButton(this);//构建关闭按钮
    QIcon closeIcon(":/titleCoin/Resources/close.png");//获取关闭按钮图标"
    connect(addTitleBar(closeButton, closeIcon,"关闭"), &QToolButton::clicked, this, &PWindow::close);

    QToolButton* minimizeButton = new QToolButton(this);
    QIcon   minimizeIcon(":/titleCoin/Resources/min.png");
    connect(addTitleBar(minimizeButton, minimizeIcon,"最小化"), &QToolButton::clicked, this, &PWindow::showMinimized);
    
    QToolButton* setButton = new QToolButton(this);
    QIcon   setIcon(":/titleCoin/Resources/set.png");
    connect(addTitleBar(setButton, setIcon,"设置"), &QToolButton::clicked, this, &PWindow::showMinimized);//需要实现这个方法