Why can't I create an Action in Xcode?

问题

When I follow the instructions at How do I add an action or outlet to a class in Xcode 4.3.1?, or Apple's First iOS App tutorial, there's no option for Action. There is only options for Outlet and Outlet Connections. What am I doing wrong?

回答1:

You can connect actions only to subclasses of UIControl.

You are trying to create an action from a UIView, which is not a subclass of UIControl and does not have actions.

Start the drag from the button, and not the "main view"

来源：https://stackoverflow.com/questions/15730019/why-cant-i-create-an-action-in-xcode