Qt自带图标

 1.图标枚举

enum StandardPixmap {
        SP_TitleBarMenuButton,
        SP_TitleBarMinButton,
        SP_TitleBarMaxButton,
        SP_TitleBarCloseButton,
        SP_TitleBarNormalButton,
        SP_TitleBarShadeButton,
        SP_TitleBarUnshadeButton,
        SP_TitleBarContextHelpButton,
        SP_DockWidgetCloseButton,
        SP_MessageBoxInformation,
        SP_MessageBoxWarning,
        SP_MessageBoxCritical,
        SP_MessageBoxQuestion,
        SP_DesktopIcon,
        SP_TrashIcon,
        SP_ComputerIcon,
        SP_DriveFDIcon,
        SP_DriveHDIcon,
        SP_DriveCDIcon,
        SP_DriveDVDIcon,
        SP_DriveNetIcon,
        SP_DirOpenIcon,
        SP_DirClosedIcon,
        SP_DirLinkIcon,
        SP_DirLinkOpenIcon,
        SP_FileIcon,
        SP_FileLinkIcon,
        SP_ToolBarHorizontalExtensionButton,
        SP_ToolBarVerticalExtensionButton,
        SP_FileDialogStart,
        SP_FileDialogEnd,
        SP_FileDialogToParent,
        SP_FileDialogNewFolder,
        SP_FileDialogDetailedView,
        SP_FileDialogInfoView,
        SP_FileDialogContentsView,
        SP_FileDialogListView,
        SP_FileDialogBack,
        SP_DirIcon,
        SP_DialogOkButton,
        SP_DialogCancelButton,
        SP_DialogHelpButton,
        SP_DialogOpenButton,
        SP_DialogSaveButton,
        SP_DialogCloseButton,
        SP_DialogApplyButton,
        SP_DialogResetButton,
        SP_DialogDiscardButton,
        SP_DialogYesButton,
        SP_DialogNoButton,
        SP_ArrowUp,
        SP_ArrowDown,
        SP_ArrowLeft,
        SP_ArrowRight,
        SP_ArrowBack,
        SP_ArrowForward,
        SP_DirHomeIcon,
        SP_CommandLink,
        SP_VistaShield,
        SP_BrowserReload,
        SP_BrowserStop,
        SP_MediaPlay,
        SP_MediaStop,
        SP_MediaPause,
        SP_MediaSkipForward,
        SP_MediaSkipBackward,
        SP_MediaSeekForward,
        SP_MediaSeekBackward,
        SP_MediaVolume,
        SP_MediaVolumeMuted,
        SP_LineEditClearButton,
        SP_DialogYesToAllButton,
        SP_DialogNoToAllButton,
        SP_DialogSaveAllButton,
        SP_DialogAbortButton,
        SP_DialogRetryButton,
        SP_DialogIgnoreButton,
        SP_RestoreDefaultsButton,
        SP_TabCloseButton,
        NStandardPixmap, // assertion value for sync with QPlatformTheme::StandardPixmap
        // do not add any values below/greater than this
        SP_CustomBase = 0xf0000000
    };

2.图标设置

QStyle *sytle = QApplication::style();
    QIcon icon = sytle->standardIcon((QStyle::StandardPixmap)index);
    ui->pushButton->setIcon(icon);
    QSize size = ui->pushButton->size();
    ui->pushButton->setIconSize(size);

3.测试程序

qt默认图标测试程序及显示资源-优快云文库