Erm?
Qt Code:
  1. // main.cpp
  2. #include <QtGui>
  3.  
  4. int main(int argc, char* argv[])
  5. {
  6. QApplication app(argc, argv);
  7. QCheckBox checkBox;
  8. qDebug() << checkBox.isChecked(); // "false"
  9. checkBox.setChecked(true);
  10. qDebug() << checkBox.isChecked(); // "true"
  11. }
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