I implemented something like this for my 'Clock' iOS app about 6 months ago. Check out: http://itunes.apple.com/us/app/clock-free/id497161475?mt=8 http://itune

I implemented something like this for my 'Clock' iOS app about 6 months ago. Check out: http://itunes.apple.com/us/app/clock-free/id497161475?mt=8 http://itunes.apple.com/us/app/clock-free/id497161475?mt=8 and double tap to set the alarm using this UI metaphor. The takeaway for me was that UIWebView is still too unresponsive to handle touch events, so although the app uses HTML5, the touch event handling had to be implemented in ObC.