安裝庫
sudo apt-get install fcitx-frontend-qt5
複製到Qt安裝目錄下的文件夾
cp `find /usr/lib -name "libfcitxplatforminputcontextplugin.so"` ~/Qt5.13.2/Tools/QtCreator/lib/Qt/plugins/platforminputcontexts/
增加權限
sudo chmod 775 ~/Qt5.13.2/Tools/QtCreator/lib/Qt/plugins/platforminputcontexts/libfcitxplatforminputcontextplugin.so