You can drag the picture, and can rotate images of demo, selection of learning IOS programming source code, a good reference.

KnobSample
..........\KnobSample
..........\KnobSample.xcodeproj
..........\....................\project.pbxproj
..........\....................\project.xcworkspace
..........\....................\...................\contents.xcworkspacedata
..........\..........\AppDelegate.h
..........\..........\AppDelegate.m
..........\..........\en.lproj
..........\..........\........\InfoPlist.strings
..........\..........\........\ViewController.xib
..........\..........\knob.acorn
..........\..........\knob.png
..........\..........\knob@2x.png
..........\..........\KnobSample-Info.plist
..........\..........\KnobSample-Prefix.pch
..........\..........\main.m
..........\..........\ViewController.h
..........\..........\ViewController.m
KTOneFingerRotationGestureRecognizer.h
KTOneFingerRotationGestureRecognizer.m
LICENSE
OneFingerRotation
OneFingerRotation.xcodeproj
...........................\project.pbxproj
...........................\project.xcworkspace
...........................\...................\contents.xcworkspacedata
.................\Classes
.................\.......\AppDelegate.h
.................\.......\AppDelegate.m
.................\.......\RootViewController.h
.................\.......\RootViewController.m
.................\en.lproj
.................\........\InfoPlist.strings
.................\images
.................\......\astroland.jpg
.................\......\subway.jpg
.................\......\tower.jpg
.................\Info.plist
.................\main.m
.................\Prefix.pch
.................\xibs
.................\....\MainWindow_iPad.xib
.................\....\MainWindow_iPhone.xib
.................\....\RootView~ipad.xib
.................\....\RootView~iphone.xib
README.md

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