A back button on the UINavigationController look like a instagram navigation controller,may be useful to you!

CustomBackButton\BaseViewController.xib
................\CustomBackButton-Info.plist
................\CustomBackButton_Prefix.pch
................\MainWindow.xib
................\README.md
................\RootViewController.xib
................\main.m
................\Images\button.png
................\......\Reeder\BarBackground.png
................\......\......\reedericon.png
................\......\......\reedericon@2x.png
................\......\Instagram\InstagramIcon.png
................\......\.........\InstagramIcon@2x.png
................\......\.........\navigationBarBackButton.png
................\......\.........\navigationBarBackButton2.png
................\......\.........\navigationBarBackButton@2x.png
................\......\.........\navigationBarBackgroundRetro.png
................\......\.........\navigationBarBackgroundRetro@2x.png
................\......\.........\navigationBarLogo.png
................\......\.........\navigationBarLogo@2x.png
................\......\DailyBooth\DailyBoothIcon.png
................\......\..........\DailyBoothIcon@2x.png
................\......\..........\back_button_alpha.png
................\......\..........\back_button_alpha@2x.png
................\......\..........\db_navbar_bg.png
................\......\..........\db_navbar_bg@2x.png
................\CustomBackButton.xcodeproj\project.pbxproj
................\.lasses\BaseViewController.h
................\.......\BaseViewController.m
................\.......\CustomBackButtonAppDelegate.h
................\.......\CustomBackButtonAppDelegate.m
................\.......\CustomNavigationBar.h
................\.......\CustomNavigationBar.m
................\.......\DailyBoothViewController.h
................\.......\DailyBoothViewController.m
................\.......\InstagramViewController.h
................\.......\InstagramViewController.m
................\.......\ReederViewController.h
................\.......\ReederViewController.m
................\.......\RootViewController.h
................\.......\RootViewController.m
................\Images\Reeder
................\......\Instagram
................\......\DailyBooth
................\Images
................\CustomBackButton.xcodeproj
................\Classes
CustomBackButton

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