多个按钮在一个槽函数实现：sender()《猜数字游戏》

我们在写QT的程序时，有UI来做界面，其中有许多按钮，一个一个来实现槽函数就非常不方便，因此用sender()函数来判别此次实现的什么操作

OBJECT*btn= (OBJECT*)this->sender();

来实现此时进行的什么操作，非常方便。下面用一个简易的猜数字游戏来说明一下

 

#include "widget.h"

#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>
#include<QTime>
#include<QTimer>
namespace Ui {
class Widget;
}

class Widget : public QWidget
{
    Q_OBJECT

public:
    explicit Widget(QWidget *parent = 0);
    ~Widget();
public slots:
    void MyProgressClickNum();
private:
    Ui::Widget *ui;
    int srandNum;//生成随机数
    QString currentNumber;
    void Init();
};

#endif // WIDGET_H

 main函数

#include "widget.h"
#include <QApplication>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    Widget w;
    w.setWindowTitle(QStringLiteral("猜数字游戏"));
    w.show();

    return a.exec();
}

#include "widget.h"
#include "ui_widget.h"
#include<QPushButton>
#include<QDebug>
Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{
    ui->setupUi(this);

    currentNumber.clear();
    Init();
}

Widget::~Widget()
{
    delete ui;
}
void Widget::Init()
{
     qsrand(QTime(0,0,0).secsTo(QTime::currentTime()));
    srandNum=qrand()%100;
    connect(ui->pushButton_0,SIGNAL(clicked(bool)),this,SLOT(MyProgressClickNum()));
    connect(ui->pushButton_1,SIGNAL(clicked(bool)),this,SLOT(MyProgressClickNum()));
    connect(ui->pushButton_2,SIGNAL(clicked(bool)),this,SLOT(MyProgressClickNum()));
    connect(ui->pushButton_3,SIGNAL(clicked(bool)),this,SLOT(MyProgressClickNum()));
    connect(ui->pushButton_4,SIGNAL(clicked(bool)),this,SLOT(MyProgressClickNum()));
    connect(ui->pushButton_5,SIGNAL(clicked(bool)),this,SLOT(MyProgressClickNum()));
    connect(ui->pushButton_6,SIGNAL(clicked(bool)),this,SLOT(MyProgressClickNum()));
    connect(ui->pushButton_7,SIGNAL(clicked(bool)),this,SLOT(MyProgressClickNum()));
    connect(ui->pushButton_8,SIGNAL(clicked(bool)),this,SLOT(MyProgressClickNum()));
    connect(ui->pushButton_9,SIGNAL(clicked(bool)),this,SLOT(MyProgressClickNum()));
    connect(ui->pushButton_ok,SIGNAL(clicked(bool)),this,SLOT(MyProgressClickNum()));
   //sender()
}
void Widget::MyProgressClickNum()
{
    QPushButton*btn= (QPushButton*)this->sender();//判断哪一操作！！！
    QString text=btn->text();
    if(currentNumber.length()<2)
    {
       currentNumber.append(text);//不足两位数就继续追加
    }
    else if(currentNumber.length()==2)
    {
        if(btn==ui->pushButton_ok)
        {
            if(currentNumber.toInt()== srandNum)
            {
                 QString str=QStringLiteral("回答正确");
                 ui->textEdit->setText(str);
                 //currentNumber.clear();
            }
            if(currentNumber.toInt()< srandNum)
            {
                 QString str=QStringLiteral("猜的数字小了");
                 ui->textEdit->setText(str);
                 currentNumber.clear();
            }
            if(currentNumber.toInt()> srandNum)
            {
                 QString str=QStringLiteral("猜的数字大了");
                 ui->textEdit->setText( str);
                 currentNumber.clear();
            }

        }

    }
    else
        {
          currentNumber.clear();
        }

     ui->lcdNumber->display(currentNumber);
}