c++ - 从 QObject 中删除动态属性

Question

有没有办法删除分配给 QObject 的所有动态属性？

Answer 1

试试这个:

for (auto const &name : object->dynamicPropertyNames())
{
    object->setProperty(name.constData(), {});
}
Q_ASSERT(object->dynamicPropertyNames().empty());

这会遍历所有动态属性并设置空的 QVariant 值。如果断言失败，那么这是一个 Qt 错误，因为文档说:

http://doc.qt.io/qt-5/qobject.html#dynamic-properties

From Qt 4.2, dynamic properties can be added to and removed from QObject instances at run-time.

和

Dynamic properties ... can be removed by setting the property value to an invalid QVariant.