Quote:
Originally Posted by Blackterrier
So far, I've not come across an app that the pencil doesn't work on. The app itself has to allow drawing and note taking before you can use the pencil to do so, as it is just an extention or substitute for your finger.
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Beyond normal touch events, Apple Pencil uses extensions to UITouch class with methods that provide more precise location, stylus angle relative to screen, and pressure sensitivity. So apps have to do extra work if they want to take advantage of this information.