NSFileManager defaultManager fileExistsAtPath:filepath isDirectory:&isDir not properly working?

NSFileManager defaultManager fileExistsAtPath:filepath isDirectory:&isDir
not properly working?

References

Reference NO 1

http://stackoverflow.com/questions/15194808/nsfilemanager-defaultmanager-fileexistsatpathfilepath-isdirectoryisdir-not-pr

Reference NO 2

http://cadabracorp.com/blog/2012/09/07/storingaccessing-files-in-your-app-folder-for-private-or-public-use/

Reference NO 3

http://developer.apple.com/library/ios/DOCUMENTATION/Cocoa/Reference/Foundation/Classes/NSFileManager_Class/Reference/Reference.html

Reference NO 4

http://questiontrack.com/nssearchpathfordirectoriesindomains-nsuserdomainmask-1117330.html

Reference NO 5

http://www.cocoachina.com/wiki/index.php?title=NSFileManager

Reference NO 6

http://wiki.eoe.cn/page/iOS_ObjC_classic_NSFileManager_Class_Reference.html

Reference NO 7

http://disanji.net/iOS_Doc/documentation/Cocoa/Reference/Foundation/Classes/NSFileManager_Class/

Reference NO 8

http://www.blogosfera.co.uk/2013/03/uicollectionview-multiple-different-cells/