代码修改只显示修改部分：用户点击Lights界面从数据库的Status表中得到最新的智能灯device_state和value更新在Lights页面当用户未对SwitchForm进行操作但对ctrlform更改时由于SwitchForm的状态是靠点击触发的如果ui上显示开启状态true时flag默认为FALSE存入Status的device_state为关闭false出现错误如何解决#ifndef

以下是修改部分的代码：

Lights.h:

#ifndef LIGHTS_H
#define LIGHTS_H

#include <QWidget>

namespace Ui {
class Lights;
}

class Lights : public QWidget
{
    Q_OBJECT

public:
    explicit Lights(int userid, QWidget *parent = nullptr);
    ~Lights();
    void lightsWidget();
    bool flag = false;

    void showEvent(QShowEvent *event); // 重写界面
    void hideEvent(QHideEvent *event); // 隐藏界面

    void loadLastStatus(); // 加载上次更改的状态
    void saveLastStatus(); // 保存当前更改的状态

public slots:
    bool switchButton_status(bool checked);

private:
    Ui::Lights *ui;
    int userid;

    void closeEvent(QCloseEvent *event);
    QString getLastBrightness(int userid);
    QString getLastState(int userid);
    void updateLastBrightness(int userid, QString state, QString brightness);
    void updateSmartHomeStatus(int userid, QString deviceName, QString state, QString brightness);
};

#endif // LIGHTS_H

Lights.cpp:

#include "lights.h"
#include "ui_lights.h"
#include "switchform.h"
#include "sqlite.h"
#include <QSqlQuery>
#include <QSqlDatabase>
#include <QSqlError>
#include <QCloseEvent>
#include <QDebug>

Lights::Lights(int userid, QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Lights),
    userid(userid)
{
    ui->setupUi(this);
    lightsWidget();
    connect(ui->SwitchStatus, &SwitchForm::statusChanged, this, &Lights::switchButton_status);
    connect(ui->ctrlform, &CtrlForm::valueChanged, this, [=](int value) {
        if (flag) {
            qDebug() << value << userid;
            updateSmartHomeStatus(userid, QString("智能灯"), QString("开启"), QString::number(value));
        }
        else {
            qDebug() << "智能灯未打开！";
            updateSmartHomeStatus(userid, QString("智能灯"), QString("关闭"), QString("0"));
        }
    });
    loadLastStatus();
}

Lights::~Lights()
{
    delete ui;
}

void Lights::lightsWidget()
{
    setWindowTitle("智能灯设置");
    setAutoFillBackground(true);
    QPalette palette = this->palette();
    QPixmap pixmap(":/user/image/image/light.jpg");
    palette.setBrush(QPalette::Window, QBrush(pixmap));
    setPalette(palette);
    setFixedSize(600, 400);
}

bool Lights::switchButton_status(bool checked)
{
    qDebug() << checked;
    flag = checked;
    return flag;
}

void Lights::showEvent(QShowEvent *event)
{
    loadLastStatus();
    event->accept();
}

void Lights::hideEvent(QHideEvent *event)
{
    saveLastStatus();
    event->accept();
}

void Lights::closeEvent(QCloseEvent *event)
{
    hide();
    event->ignore();
}

void Lights::loadLastStatus()
{
    qDebug() << this->userid;
    QString state = getLastState(this->userid);
    QString brightness = getLastBrightness(this->userid);
    qDebug() << brightness;
    if (state == "开启") {
        ui->SwitchStatus->setChecked(true);
        ui->ctrlform->setValue(brightness.toInt());
    }
    else {
        ui->SwitchStatus->setChecked(false);
        ui->ctrlform->setValue(0);
    }
    qDebug() << brightness.toInt();
}

void Lights::saveLastStatus()
{
    qDebug() << this->userid;
    QString state = QString(flag);
    QString brightness = QString::number(ui->ctrlform->getValue());
    updateLastBrightness(this->userid, state, brightness);
}

QString Lights::getLastBrightness(int userid)
{
    Sqlite::sqlite_init();
    QString queryStr = QString("SELECT value FROM Status WHERE uid = %1 AND device_name = '智