这里用CPP创建一个类
MyQmlClass.h
#pragma once
#include <QObject>
class MyQmlClass : public QObject {
Q_OBJECT
private:
int m_value;
public:
explicit MyQmlClass(QObject* parent = nullptr) : QObject(parent) {};
~MyQmlClass() {};
Q_INVOKABLE void setValue(int value);
Q_INVOKABLE int getValue();
};