Implementing the TOUCHkit Overlay View
The TOUCHkit overlay is a single clear UIView singleton. It’s created the first time the application requests its shared instance, and the call adds it to the application’s key window. The overlay’s user interaction flag is disabled, allowing touches to continue past the overlay and on through the responder chain, even after processing those touches through the standard began/moved/ended/cancelled event callbacks.
The touch processing events draw a circle at each touch point, creating a strong pointer to the touches until that drawing is complete. Recipe 1-13 details the callback and drawing methods that handle that functionality.
Recipe 1-13 Creating a Touch Feedback Overlay View
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