QMessageBox::information(NULL, QString("title"), QString("I am information"));

以下是自定义提示框的代码，有图有真相！提示框大部分都采用模态的形式，关于模态也不再多提！所以父类为QDialog，通过exec()返回值QDialog::Accepted或QDialog::Rejected来进行判断执行相应的事件。

#include "msg_box.h" 

MsgBox::MsgBox(QWidget *parent)
 : QDialog(parent)
{
  this->resize(320, 160);

  //获取主界面的宽度
  int width = this->width();
  int height = this->height();

  //初始化为未按下鼠标左键
  mouse_press = false;

  //设置标题栏隐藏
  this->setWindowFlags(Qt::FramelessWindowHint | Qt::Dialog);
 
  close_button = new PushButton(this);
  close_button->loadPixmap("tipclose");
  close_button->setGeometry(width-30, 0, 30, 30); 
 
  //设置标题
  title_label = new QLabel(this);
 title_label->setObjectName(QString::fromUtf8("labelOne"));
  QFont font = title_label->font();
  font.setBold(true);
  title_label->setFont(font);
  title_label->setGeometry(0, 0, width-50, 30);

  //设置提示图片
  msg_label = new QLabel(this);
  msg_label->setGeometry(20, 50, 36, 36);
  msg_label->setScaledContents(true);

  //设置提示信息，让QLabel能够自动判断并换行显示：
  ask_label = new QLabel(this);
  ask_label->setGeometry(65, 60, width-100, 25*2);
  ask_label->setWordWrap(true);
  ask_label->setAlignment(Qt::AlignTop);
 
  check_box = new QCheckBox(this);
  check_box->setGeometry(10, height - 35, 160, 25);
  check_box->setHidden(true);

  cancel_button = new QPushButton(this);
  cancel_button->resize(70, 25);
  cancel_button->move(width - cancel_button->width() - 10, height - 35);

  ok_button = new QPushButton(this);
  ok_button->resize(70, 25);
  ok_button->move(width - ok_button->width() - cancel_button->width() - 20, height - 35);

 check_box->setStyleSheet("background:transparent;");

 ok_button->setObjectName(QString::fromUtf8("pushButtonTwo"));
 cancel_button->setObjectName(QString::fromUtf8("pushButtonTwo"));
 
  QObject::connect(ok_button, SIGNAL(clicked()), this, SLOT(okOperate()));
  QObject::connect(close_button, SIGNAL(clicked()), this, SLOT(cancelOperate()));
  QObject::connect(cancel_button, SIGNAL(clicked()), this, SLOT(cancelOperate()));

  this->translateLanguage();
}

void MsgBox::translateLanguage()
{
  close_button->setToolTip(tr("close"));
  check_box->setText(tr("remember"));
  ok_text = tr("ok");
  cancel_text = tr("cancel");
}

void MsgBox::setInfo(QString title_info, QString info, QPixmap pixmap, bool is_check_hidden, bool is_ok_hidden)
{
 title_label->setText(QString("  ") + title_info);

  //设置提示信息
  ask_label->setText(info);
  msg_label->setPixmap(pixmap);

  //是否隐藏复选框
  check_box->setChecked(false);
  check_box->setHidden(is_check_hidden);

  //是否隐藏确定按钮
  ok_button->setHidden(is_ok_hidden);
  if(is_ok_hidden)
  {
   cancel_button->setText(ok_text);
  }
  else
  {
   ok_button->setText(ok_text);
   cancel_button->setText(cancel_text);
  }

  //设置默认按钮为取消按钮
  cancel_button->setFocus();
}

void MsgBox::paintEvent(QPaintEvent *)
{
  QPainter painter(this);
  painter.drawPixmap(rect(), QPixmap(":/icon/tip"));

  QBitmap bitmap(this->size());
  QPainter painter2(&bitmap);
  painter2.fillRect(bitmap.rect(), Qt::white);
  painter2.setBrush(QColor(0, 0, 0));
  painter2.drawRoundedRect(rect(), 4, 4);
  setMask(bitmap);
}

void MsgBox::mousePressEvent( QMouseEvent * event )
{
  //只能是鼠标左键移动和改变大小
  if(event->button() == Qt::LeftButton)
  {
    mouse_press = true;
  }

  //窗口移动距离
  move_point = event->globalPos() - pos();
}

void MsgBox::mouseReleaseEvent( QMouseEvent *)
{
  mouse_press = false;
}

void MsgBox::mouseMoveEvent(QMouseEvent *event)
{
  //移动窗口
 if(mouse_press)  
  {
    QPoint move_pos = event->globalPos();
   move(move_pos - move_point);
  }
}

void MsgBox::okOperate()
{
  bool is_hidden = check_box->isHidden();
  if(!is_hidden)
  {
    bool is_checked = check_box->isChecked();
    emit msgChecked(is_checked, true);
  }
  this->accept();
}

void MsgBox::cancelOperate()
{
  bool is_check_hidden = check_box->isHidden();
  bool is_ok_hidden = ok_button->isHidden();
  if(!is_check_hidden)
  {
    bool is_checked = check_box->isChecked();
   if(!is_ok_hidden)
    {
      emit msgChecked(is_checked, false);
    }
   else
   {
    emit okMessageHidden(is_checked);
   } 
  }

  this->reject();
}

 效果图：

MsgBox *msg_box = new MsgBox();
 msg_box->setInfo(QString("文件删除"), QString("确实要把文件放入回收站吗?"), QPixmap(":/icon/attention"), true, false);
 msg_box->exec();

MsgBox *msg_box2 = new MsgBox();
 msg_box2->setInfo(QString("重命名"), QString("文件名不能包含下列任何字符：\n    \\ / : * ? \" < > |"), QPixmap(":/icon/attention"), true, true);
 msg_box2->exec();

 

MsgBox *msg_box3 = new MsgBox();
 msg_box3->setInfo(QString("批量文件删除"), QString("确实要把所有文件放入回收站吗?"), QPixmap(":/icon/attention"), false, false);
 msg_box3->exec();