C++通过函数访问QML

1、QML

function setValue(value)
{
    if(value>1 || value<0)
    {
        return;
    }
    pen.score = value;
    pen.requestPaint();
}

2、C++

#include <QMetaObject>
QMetaObject::invokeMethod(root, "setValue", Q_ARG(QVariant, QVariant(0.8)));

Q_ARG是入参，如果需要接收返回值用Q_RETURN_ARG(QVariant, returnedValue),