How to correctly subclass UIGestureRecognizer

问题:

I have gone through the documentation: https://web.archive.org/web/20130309051214/http://developer.apple.com/library/ios/documentation/EventHandling/Conceptual/EventHandlingiPhoneOS/GestureRecognizer_basics/GestureRecognizer_basics.html#//apple_ref/doc/uid/TP40009541-CH2-SW2

I am trying to implement the check mark example shown in the documentation and I can't because the compiler shows a bunch of warnings about the [super touchesMoved:touches withEvent:event] call, which is recommended by the documentation.

Where's the full example to learn how to correctly subclass for implementing a custom gesture?

回答1:

I found the following WWDC 2010 Session Videos extremely useful:

• Session 120 - Simplifying Touch Event Handling with Gesture Recognizers (pdf)
• Session 121 - Advanced Gesture Recognition (pdf)

To access these videos you must login at https://developer.apple.com.