制作自定义 QProgressBar

Question

我在尝试启动以下代码时遇到 undefined reference to vtable for CustomProgressBar' 错误：
customprogressbar.h

#ifndef CUSTOMPROGRESSBAR_H
#define CUSTOMPROGRESSBAR_H
#include <QProgressBar>
#include "task.h"

class CustomProgressBar : public QProgressBar
{
Q_OBJECT
public:
    CustomProgressBar(DayTask, QWidget* parent = 0);
protected:
    void paintEvent(QPaintEvent *) Q_DECL_OVERRIDE;

private:
    DayTask task;
};

#endif // CUSTOMPROGRESSBAR_H

customprogressbar.cpp

#include "customprogressbar.h"
#include <QPainter>

CustomProgressBar::CustomProgressBar(DayTask task, QWidget* parent) :
    task{task},
    QProgressBar(parent)
{

}
//paintevent

什么可能导致问题？

Answer 1

也许 moc（元 object 编译器）没有被运行用于您的 header？无论如何，this question

是重复的

制作自定义 QProgressBar

Making custom QProgressBar

c++

qt

qprogressbar