qt中connect报错

Question

#include "QtWidgetsApplication3.h"
#include<QButtonGroup>
QtWidgetsApplication3::QtWidgetsApplication3(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::QtWidgetsApplication3Class())
{
    ui->setupUi(this);
    iniUI();
}

QtWidgetsApplication3::~QtWidgetsApplication3()
{
    delete ui;
}
 void QtWidgetsApplication3::iniUI()
{
    auto buttonGroup = new QButtonGroup(this);
     auto btnList = findChildren<QPushButton*>();
     for (auto btn : btnList)
     {
         buttonGroup->addButton(btn);
     }
     connect(buttonGroup, &QButtonGroup::buttonClicked,this, &QtWidgetsApplication3::onButtonGroupClicked);

}
void onButtonGroupClicked(QAbstractButton* btn)
{
    qInfo() << btn->text();
    QString name = btn->text();
    if (name >= "0" && name <= "9")
    {
        ui->lineEdit->insert(name);
    }
}

Answer 1

由于QButtonGroup::buttonClicked有多个重载版本，无法直接使用新的信号与槽语法进行连接，可以使用QOverload宏，显式地指定连接的函数重载，避免了重载函数的歧义问题。

connect(buttonGroup, QOverload<QAbstractButton*>::of(&QButtonGroup::buttonClicked), this, &QtWidgetsApplication3::onButtonGroupClicked);