Responder chain (1)

 

If the view chooses to not handle a touch event, then it will be sent up the responder chain, which will follow this path:

• The first responder is the hit-tested view (the view under the touch)
• Next responder is its super view
• The chain continues up the view hierarchy until it reaches a view that is associated with a view controller
• That view controller will be the next responder
• If this view controller is a root controller, then the window will be the next responder
• The application is the window’s next responder
• The last responder in the chain is the App delegate