In this moment the great qr/bar code reader library ZBar (SourceForge link) don't work on iPhone 5 simply because noone has re-compiled the library for armv7, and if you try to use this lib in you armv7s ready ios project you obtain:

1. ld: file is universal (3 slices) but does not contain a(n) armv7s slice: /Users/rainbird/Desktop/myapp/iFileManager/iFileManager/ZBarSDK/libzbar.a for architecture armv7s
2. clang: error: linker command failed with exit code 1 (use -v to see invocation)

   here two solutions:
   The easy and ready to cook solution: Download and include my re-compiled library (support armv6-7-7s and i386) fromHERE (note: no warranty, no support, nothing, if don't work delete it )

   The advanced solution: re-compile yourself the libzbar.a following this steps:

    

   1 - Download the source code (you must have Mercurial for mac):

   hg clone http://zbar.hg.sourceforge.net:8000/hgroot/zbar/zbar
   cd zbar 
   hg checkout iPhoneSDK-1.2.2 
   open iphone/zbar.xcodeproj

   2 - In the xcode project edit the libzbar scheme and select Release in Build configuration

   

    

   3 - Compile libzbar for device AND for simulator, here the configuration:

   

   4 - Find the compiled libzbar.a and go in the folder using Teminal.app, my folder:

   /Users/kappe/Library/Developer/Xcode/DerivedData/zbar-gyozyrpbqzvslmfoadhqkwskcesd/Build/Products

   In this folder you you should have two sub folder Release-iphoneos and Release-iphonesimulator

   5 - using xcode command line tools build you universal lib:

   lipo -create Release-iphoneos/libzbar.a Release-iphonesimulator/libzbar.a -o libzbar.a

   the end now you can use the libzbar.a created, both in device and simulator.

   Update:

   When you make Product -> Archive to avoid the error:

   [xml] view plaincopy
   1. 'Cordova/CDVViewController.h' file not found

      add this fields:

      $(BUILT_PRODUCTS_DIR)
      $(OBJROOT)/UninstalledProducts/include
      $(TARGET_BUILD_DIR)/usr/local/lib/include

      to Your taget - > Building settings -> Header search paths

       

      http://www.federicocappelli.net/2012/10/05/zbar-library-for-iphone-5-armv7s/