Qt: get sender in slot (the control that triggers signal)

Qt Development , One scenario is to click three different buttons , Trigger the same event （SLOT）, To be in SLOT Method to distinguish three different buttons ：

connect(ui->btnType1, SIGNAL(clicked()),this,SLOT(changeType2()));
connect(ui->btnType2, SIGNAL(clicked()),this,SLOT(changeType2()));
connect(ui->btnType3, SIGNAL(clicked()),this,SLOT(changeType2()));
...

void FormCL3P::changeType2()
{
   // Get the clicked button 
   //?
}

So how to SLOT Get the current sender Well ？ The answer was found on the Internet .

use sender() Method ：

void FormCL3P::changeType2()
{
    QObject* btn = sender();
    if (btn == ui->btnType1){ ... }
    if (btn == ui->btnType2){ ... }
    if (btn == ui->btnType3){ ... }
}

Reference resources ：In qml, How can i get signal sender from slot/function? | Qt Forum