Qt动态添加及删除控件(以QPushButton为例)

　　Qt通过界面编辑器可以快速制作界面，但有的界面还是需要动态创建（删除）一些控件。

　　下面就以在界面中添加PushButton为例，完成相关操作。

首先在界面中放置一个QGroupBox及两个按钮，效果如下图所示：

　　

通过点击add按钮添加3个水平放置的QPushbutton，点击delete删除

　　

　　

 

dynamicCreationAndDeletion.h代码如下：

#ifndef DYNAMICCREATIONANDDELETION_H
#define DYNAMICCREATIONANDDELETION_H

#include <QMainWindow>

namespace Ui {
class dynamicCreationAndDeletion;
}

class dynamicCreationAndDeletion : public QMainWindow
{
    Q_OBJECT

public:
    explicit dynamicCreationAndDeletion(QWidget *parent = 0);
    ~dynamicCreationAndDeletion();

private slots:
    void on_pushButton_add_clicked();

    void on_pushButton_delete_clicked();

private:
    QStringList buttonNameList;
    QString hBoxLay = "HBL";
    Ui::dynamicCreationAndDeletion *ui;
};

#endif // DYNAMICCREATIONANDDELETION_H

 

dynamicCreationAndDeletion.c代码如下：

#include "dynamiccreationanddeletion.h"
#include "ui_dynamiccreationanddeletion.h"

dynamicCreationAndDeletion::dynamicCreationAndDeletion(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::dynamicCreationAndDeletion)
{
    ui->setupUi(this);
    buttonNameList.append("pb1");
    buttonNameList.append("pb2");
    buttonNameList.append("pb3");
}

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

void dynamicCreationAndDeletion::on_pushButton_add_clicked()
{
    //创建水平布局,用于设置按钮的排列顺序
    QHBoxLayout * hBoxLayout = new QHBoxLayout();
    hBoxLayout->setObjectName(hBoxLay);
    foreach(QString buttonName,buttonNameList)
    {
        QPushButton *pButton = new QPushButton(buttonName,ui->groupBox_pB);
        pButton->setObjectName(buttonName);
        pButton->setText(buttonName);
        hBoxLayout->addWidget(pButton);
    }
    ui->groupBox_pB->setLayout(hBoxLayout);
}

void dynamicCreationAndDeletion::on_pushButton_delete_clicked()
{
    foreach(QString buttonName, buttonNameList)
    {
        //获取groupBox中的Pushbutton
        QPushButton *pushBt =  ui->groupBox_pB->findChild<QPushButton*>(buttonName);
        //删除pushButton
        delete pushBt;
    }
    //删除水平布局,如果此处不删除，会使得第二次添加相同名称的QPushbutton时失败
    QHBoxLayout *HBoxlay = ui->groupBox_pB->findChild<QHBoxLayout*>(hBoxLay);
    delete HBoxlay;
}