1. Qt Widget ~Hello World~" luyikei

2. Luyikei (?!)w 3. HelloWorld() ... 4. 10 5. (:,) () 6. 7. : click() QPushButton close() QMainWindow 8. :connect(ui- >pushButton,SIGNAL(clicked()),this,SLOT(close( ))); ... 9. Qt Creator ( ) 10. Qt