The navigation bar, select learning IOS programming source code, a good reference.

instagramNavigationBar
......................\.DS_Store
......................\instagramNavigationBar
......................\instagramNavigationBar.xcodeproj
......................\................................\project.pbxproj
......................\................................\project.xcworkspace
......................\................................\...................\contents.xcworkspacedata
......................\................................\...................\xcuserdata
......................\................................\...................\..........\borey.xcuserdatad
......................\................................\...................\..........\.................\UserInterfaceState.xcuserstate
......................\................................\xcuserdata
......................\................................\..........\borey.xcuserdatad
......................\................................\..........\.................\xcschemes
......................\................................\..........\.................\.........\instagramNavigationBar.xcscheme
......................\................................\..........\.................\.........\xcschememanagement.plist
......................\......................\AppDelegate.h
......................\......................\AppDelegate.m
......................\......................\en.lproj
......................\......................\........\InfoPlist.strings
......................\......................\instagramNavigationBar-Info.plist
......................\......................\instagramNavigationBar-Prefix.pch
......................\......................\main.m
......................\......................\MainContrtoller.h
......................\......................\MainContrtoller.m
__MACOSX
........\instagramNavigationBar
........\......................\._.DS_Store
........\......................\instagramNavigationBar
........\......................\......................\._AppDelegate.h
........\......................\......................\._AppDelegate.m
........\......................\......................\._instagramNavigationBar-Prefix.pch
........\......................\......................\._main.m
........\......................\......................\._MainContrtoller.h
........\......................\......................\._MainContrtoller.m
........\......................\......................\en.lproj
........\......................\......................\........\._InfoPlist.strings

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