curveview.cpp:10:12: error: allocation of incomplete type 'Ui::CurveView'
curveview.h:39:7: note: forward declaration of 'Ui::CurveView'
解决:要导入add existing directory,不要复制粘贴文件中代码
curveview.cpp:10:12: error: allocation of incomplete type 'Ui::CurveView'
curveview.h:39:7: note: forward declaration of 'Ui::CurveView'
解决:要导入add existing directory,不要复制粘贴文件中代码