自定义数字输入键盘

仅有0-9这些数字输入的使用场景

截图：

#include <QWidget>
#include<QGridLayout>
#include<QLineEdit>
#include<QPushButton>
class numberKeyBoard : public QWidget
{
    Q_OBJECT

public:
    numberKeyBoard(QWidget *parent = 0);
    ~numberKeyBoard();
    void initInfo();

signals:
    void SigGotoNumberPage(int num);
private:

    QGridLayout*layout;

    QLineEdit*m_edit;
};
cpp:
#include "numberKeyBoard.h"

numberKeyBoard::numberKeyBoard(QWidget *parent): QWidget(parent)
    ,layout(new QGridLayout(this))
     ,m_edit(new QLineEdit(this))
{
    this->setFixedSize(240,160);
    initInfo();
}

numberKeyBoard::~numberKeyBoard()
{

}

void numberKeyBoard::initInfo()
{
    if(!layout)
    {
        return;
    }
    for(int  i = 0;i<3;++i)
    {
        for(int j = 0;j<4;++j)
        {
            QPushButton*btn = new QPushButton(this);

            btn->setFocusPolicy(Qt::NoFocus);
            connect(btn,&QPushButton::clicked,[=](){

                if((i*4+j+1) == 8)
                {
                    QString Text = m_edit->text();
                    if(Text.size()>0)
                    {
                        QString newText = Text.left(Text.size()-1);
                        m_edit->setText(newText);
                    }

                }
                else if((i*4+j+1) == 12)
                {
                    emit SigGotoNumberPage(m_edit->text().toInt());
                    m_edit->clear();
                }
                else
                {
                    QString tmp = m_edit->text();
                    tmp+=btn->text();
                    m_edit->setText(tmp);
                }


            });
            btn->setSizePolicy(QSizePolicy::Preferred,QSizePolicy::Preferred);
            if((i*4+j+1)%4!=0)
            {
                btn->setText(QString::number(i*3+j+1));
            }
            else
            {
                if((i*4+j+1) == 4)
                {
                    btn->setText("0");
                }
                else if((i*4+j+1) == 8)
                {
                    btn->setText("删除");
                }
                else if((i*4+j+1) == 12)
                {
                    btn->setText("确认");
                }
            }

            btn->setStyleSheet("background-color: rgb(255, 228, 153);color:black;font-size:24px");
            layout->addWidget(btn,i+1,j,1,1);
        }
    }
    layout->setSpacing(1);
    layout->addWidget(m_edit,0,0,1,4);
    layout->setContentsMargins(6,6,6,6);
    this->setLayout(layout);
}

使用：
connect(ui->number,&numberKeyBoard::SigGotoNumberPage,[=](int num){
qDebug()<<"num = "<<num;
});