ios - NSUrl from NSString returns null -

i want parse location of documents directory nsurl nsstring have.

when console nslog(stringurl)

i get: "/var/mobile/applications/2b35d06d-6e4a-40f2-833e-28463a946834/library/application support/myappdirectory" output. 

but when do

nsurl* url = [nsurl urlwithstring:stringurl]; 

and nslog(url) (null) output.

what doing wrong here?

from apple documentation "an nsurl object initialized urlstring. if url string malformed or nil, returns nil." stringurl isn't correct formed url. reference: https://developer.apple.com/library/mac/documentation/cocoa/reference/foundation/classes/nsurl_class/reference/reference.html#//apple_ref/occ/clm/nsurl/urlwithstring:

what want use is: fileurlwithpath: isdirectory: instead.

nsurl *url = [nsurl fileurlwithstring:[stringurl stringbyaddingpercentescapesusingencoding:nsutf8stringencoding] isdirectory:yes]; nslog(@"%@", url);