I have a page UIScrollView that will scroll 1 page left or right depending on the tilt of the phone.
I would also like to implement "Shake for a random page", but cannot figure out how to do the logic for differentiating a shake motion and a x-axis tilt.
Can these two motions be used in conjunction with one another? I don't need anything complicated like shaking while tilting, I just want both to work independently of one another.
To detect a "shake" you would check the g-force generated. It will be higher for a shake vs a tilt.
How do I detect when someone shakes an iPhone?
You can definitely use both at the same time, just check the g-force for a high enough value to indicate a shake (> 1g - adjust to get the sensitivity to your liking), then if no shake is detected fall through to the tilt checking.
The iPhone Application Programming Guide offers code samples for detecting gravity (tilt) and sudden acceleration (shakes)