QT图标切换

    ui->pushButton_cross->setStyleSheet("#pushButton_cross{border-image:url(:/img/image/delegatebutton/close.png);"
                                        "width:16px;height:16px;"
                                        "border-radius: 0px;"
                                        "padding: 0px;"
                                        "background-color:transparent;}"
                                        "#pushButton_cross:hover{border-image:url(:/img/image/delegatebutton/hoverClose.png);}");