ios8 - Writing/reading to paths with interleaved double dots fails on iOS 8 -

this code fails on ios 8, although work on ios 7

uiimage *imagetest = ...  nsstring *file = @"../documents/test.png"; nsstring *fullpath = [[[nsbundle mainbundle] bundlepath] stringbyappendingpathcomponent: file];  [uiimagepngrepresentation(imagetest) writetofile: fullpath atomically: yes];  uiimage *image = [uiimage imagenamed: file]; 

on ios 8 need use instead

nsstring *file = [[nssearchpathfordirectoriesindomains(nsdocumentdirectory, nsuserdomainmask, yes) objectatindex:0] stringbyappendingpathcomponent:@"test.png"];  [uiimagepngrepresentation(imagetest) writetofile:file atomically:yes];  uiimage *image = [[uiimage alloc] initwithcontentsoffile: file]; 

...but have refactor project , third party library works paths relative main bundle.

it seems me paths "/pathtomainbundle/myapp.app/../documents/something" either not resolved, or not allowed @ ios 8

that path should same "/pathtomainbundle/documents/something"

in ios8, resource directory(app.app), data directory(nscachesdirectory, nstemporarydirectory,..) managed separately below.

• ios7 directory hierarchy
  • app uuid
    • documents
    • library
      • caches
      • preferences
    • tmp
    • app.app
• ios8 directory hierarchy
  • resource directory uuid
    • app.app
  • data directory uuid
    • documents
    • library
      • caches
      • preferences
    • tmp

so, should fix code based on absolute path in ios8.

uiimage *imagetest = ...  nsstring *fullpath = [[nssearchpathfordirectoriesindomains(nsdocumentdirectory, nsuserdomainmask, yes) firstobject] stringbyappendingpathcomponent:@"test.png"];  [uiimagepngrepresentation(imagetest) writetofile: fullpath atomically: yes];  uiimage *image = [uiimage imagenamed: fullpath];