I was just trying out a project of mine which had Three20 in it and it seems that it doesn't compile/gives me build error. Seems like it's because some of the UITouch interface has changed. Wonder if there's a quick fix to do this?
Seems like here is the issue:
UITouch ivars have been removed of the iOS 6 SDK headers: private API access in UIViewAdditions breaks the build on iOS 6.