修改QMessageBox按钮大小的代码

可以通过继承QMessageBox并重写showEvent方法来修改QMessageBox按钮的大小。以下是示例代码：

#include <QLabel>
#include <QMessageBox>
#include <QWidget>

class MyMessageBox : public QMessageBox {
    Q_OBJECT
public:
    MyMessageBox(Icon icon, const QString& title, const QString& text, StandardButtons buttons, QWidget* parent = 0);
    ~MyMessageBox();

protected:
    void showEvent(QShowEvent* event) override;
};

MyMessageBox::MyMessageBox(Icon icon, const QString& title, const QString& text, StandardButtons buttons, QWidget* parent)
    : QMessageBox(icon, title, text, buttons, parent) {}

MyMessageBox::~MyMessageBox() {}

void MyMessageBox::showEvent(QShowEvent* event) {
    QMessageBox::showEvent(event);
    QList<QPushButton*> btns = findChildren<QPushButton*>();
    for (auto btn : btns) {
        btn->setMinimumSize(100, 50); // 设置按钮最小尺寸
        btn->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding); // 设置按钮大小策略
    }
}

在使用MyMessageBox时，只需要像使用QMessageBox一样即可：

MyMessageBox msgBox(QMessageBox::Information, "Title", "Message", QMessageBox::Ok | QMessageBox::Cancel);
msgBox.exec();