ios - Download and Save Video to Camera Roll -

this seems should straight forward based on examples , docs i've read, still unable work strange reason.

i using alamofire frame work download video instagram. once downloaded, want save video camera roll. here code download video , save disk:

let destination: (nsurl, nshttpurlresponse) -> (nsurl) = {             (temporaryurl, response) in              if let directoryurl = nsfilemanager.defaultmanager().urlsfordirectory(.documentdirectory, indomains: .userdomainmask)[0] as? nsurl {                  let finalpath = directoryurl.urlbyappendingpathcomponent("\(scripts.datetostring2(date: nsdate())).\(response.suggestedfilename!)")                 instagramengine.downloadmediapath = finalpath                  scripts.log("final path >> \(finalpath)")                  return finalpath             }              return temporaryurl         }          let request = alamofire.download(.get, self.videourl, destination)          request.response { _, response, data, error in                  nsnotificationcenter.defaultcenter().postnotificationname(kmediadownloadcomplete, object: nil)          } 

once download complete, notification triggered calls function save camera roll:

uisavevideoatpathtosavedphotosalbum(instagramengine.downloadmediapath.urlstring, self, selector("video:didfinishsavingwitherror:contextinfo:"), nil) 

everything being called based on log statements , no errors occured. didfinishsavingwitherror being called uisavevideoatpathtosavedphotosalbum , confirmed no errors found. when go check camera roll, still see no video saved there. ideas?

unfortunately there bug related uisavevideoatpathtosavedphotosalbum , format mp4, format used instagram.

there helper method called uivideoatpathiscompatiblewithsavedphotosalbum indicate whether video compatible method uisavevideoatpathtosavedphotosalbum. returns false video downloaded instagram.

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luckily still possible store videos camera roll. possible using alassetslibrary. i've tried take sample code , adapt use alassetslibrary, can working.

import assetslibrary  ... ...  func downloadvideotocameraroll() {      // local variable pointing local file path downloaded video     var localfileurl: string?      // closure generating local file path downloaded video. pointing documents directory unique udid file name.     let destination: (nsurl, nshttpurlresponse) -> (nsurl) = {         (temporaryurl, response) in          if let directoryurl = nsfilemanager.defaultmanager().urlsfordirectory(.documentdirectory, indomains: .userdomainmask)[0] as? nsurl {             let finalpath = directoryurl.urlbyappendingpathcomponent("\(nsuuid()).\(response.suggestedfilename!)")             localfileurl = finalpath.absolutestring             return finalpath         }          return temporaryurl     }      // media post should downloaded     let posturl = nsurl(string: "https://api.instagram.com/v1/media/" + "952201134785549382_250131908" + "?access_token=" + instagramengine.sharedengine().accesstoken)!      // magic happens turns posturl videourl, actual url of video media:     let videourl = nsurl(string: "https://scontent.cdninstagram.com/hphotos-xfp1/t50.2886-16/11104555_1603400416544760_416259564_s.mp4")!      // download starts     let request = alamofire.download(.get, videourl, destination)      // completion handler download     request.response { (request, response, data, error) -> void in         if let path = localfileurl {             let isvideocompatible = uivideoatpathiscompatiblewithsavedphotosalbum(path)             println("bool: \(isvideocompatible)") // logs out "bool: false"              let library = alassetslibrary()              library.writevideoatpathtosavedphotosalbum(nsurl(string: path), completionblock: { (url, error) -> void in                 // done! go check camera roll             })         }     } }