QDesignerCustomWidgetInterface:No such file or directory

[furskytl]

When I include <QDesignerCustomWidgetInterface> in one of my class,it is said that "No such file or directory"!What's wrong?What should I do?I need to integrate a custom widget into Qt Designer,so I need to subclass QDesignerCustomWidgetInterface!Thanks very much!

[llev]

Try to add the following line to your app's .pro file:

CONFIG += designer

[furskytl]

That's incredible!!!It works correctly after I take your advice!Can you tell me the reason?Why the book <C++ GUI Programming with Qt4> does not tell me!!!Thanks very much!