qt中的枚举值-QMetaEnum

测试代码

h

#include <QMainWindow>
#include <QDebug>QT_BEGIN_NAMESPACE
namespace Ui { class MainWindow; }
QT_END_NAMESPACEclass MainWindow : public QMainWindow
{Q_OBJECTpublic:MainWindow(QWidget *parent = nullptr);~MainWindow();public://枚举值测试enum BtnEnum {pushButton,pushButton_2,pushButton_3,pushButton_4,pushButton_5,pushButton_6,pushButton_7,BTN_COUNT //btn就是按钮的缩写，count就是总数};Q_ENUM(BtnEnum)
public:void someFunction();
public slots:void slot_btn_clicked();void Print(int btnType);
private:Ui::MainWindow *ui;
};
#endif // MAINWINDOW_H

cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"#include <QMetaEnum>MainWindow::MainWindow(QWidget *parent): QMainWindow(parent), ui(new Ui::MainWindow)
{ui->setupUi(this);connect(ui->pushButton,&QPushButton::clicked,this,slot_btn_clicked);
}MainWindow::~MainWindow()
{delete ui;
}void MainWindow::someFunction()
{//获取BtnEnum这个枚举变量，我们赋值给metaEnumQMetaEnum metaEnum = QMetaEnum::fromType<MainWindow::BtnEnum>();// 获取枚举的名称和值for (int i = 0; i < metaEnum.keyCount(); ++i) {const char *key = metaEnum.key(i);int value = metaEnum.value(i);qDebug() << "Key:" << key << "Value:" << value;//key和value都有了}// 根据名称获取枚举值int btnViewValue = metaEnum.keyToValue("pushButton");//根据pushButton这个名称获取对应的值（索引）qDebug() << "pushButton value:" << btnViewValue;// 根据值获取枚举名称const char *btnStopKey = metaEnum.valueToKey(MainWindow::pushButton_7);//根据枚举值获得名称（这个没啥用啊）qDebug() << "pushButton_7 key:" << btnStopKey;
}void MainWindow::slot_btn_clicked()
{QPushButton *btn = (QPushButton*)sender();//可以在槽函数中使用sender函数，知道是哪个按钮触发了这个槽函数QString objectName = btn->objectName();//获取这个变量的名称QMetaEnum metaEnum = QMetaEnum::fromType<MainWindow::BtnEnum>();int btnType = metaEnum.keyToValue(objectName.toLocal8Bit());if(btnType>= pushButton && btnType <BTN_COUNT)//BtnEnum 枚举变量的第一枚举值是pushButton，最后一个枚举值是BTN_COUNT{Print(btnType);}
}void MainWindow::Print(int btnType)
{QMetaEnum metaEnum = QMetaEnum::fromType<MainWindow::BtnEnum>();qDebug()<<metaEnum.key(btnType)<<"被调用了";
}

讲解

• QMetaEnum metaEnum = QMetaEnum::fromTypeMainWindow::BtnEnum();
  可以获取qt中的枚举对象
• key(i)，value(i)qt中的枚举对象分别可以使用key和value获取对应的枚举名称和枚举索引