Qt Style Sheets Example With Custom Title Bar!!!
step 1: add Qss.h,Qss.cpp,qss.qrc to your project.
step 2: add code like this:
QFile file(":/qss/css/qss.css");
if (!file.open(QIODevice::ReadOnly))
exit(0);
QTextStream in(&file);
QString css = in.readAll();
qApp->setStyleSheet(css);
to you main function.
step3: your UI class inherit from QssDialog, QssMainWindow provided by Qss.