image - iOS sharing picture on Social Networks -

my app let user take picture, , add overlay before saving it.

i'd let user share picture using whatever app able handle images (i.e : email, facebook, twitter...), intent on android.

i tried use uidocumentcontroller, doesn't show facebook or twitter in official gallery. makes app crashes after taking second picture.

is there simple way ? don't wan't use facebook sdk , on.

here when picture taken :

[stillimageoutput capturestillimageasynchronouslyfromconnection:videoconnection completionhandler:  ^(cmsamplebufferref imagesamplebuffer, nserror *error) {       if(!error){          //resize picture , add overlay          uiimage *picture = [self imagefromsamplebuffer:imagesamplebuffer];          //custom code letting me save picture in specific album          [self.library saveimage:picture toalbum:@"myapp" metadata:metadata withcompletionblock:^(nserror *error,nsurl* asseturl) {              if (error!=nil) {                  nslog(@"big error: %@", [error description]);              } else {                  nslog(@"image saved");                  nsstring *path = [[nssearchpathfordirectoriesindomains(nsdocumentdirectory, nsuserdomainmask, yes) objectatindex:0] stringbyappendingpathcomponent:@"tmp.jpg"];                 //only way use uidocumentcontroller save file @ known location                 nsdata* imagedata = uiimagejpegrepresentation(picture, 0.9f);                 [imagedata writetofile:path atomically:no];                 nslog(@"%@",path);                 doccontroller.url = [nsurl fileurlwithpath:path];                  // make app crash after second picture                  [doccontroller presentpreviewanimated:yes];             }          }];       } else {          nslog(@"%@",error);      }   }]; 

ios has inbuilt social sharing kit. can share images via email, facebook , twitter. using google+ , other social services need respective sdks.

1) facebook

slcomposeviewcontroller *controller = [slcomposeviewcontroller composeviewcontrollerforservicetype:slservicetypefacebook];     [controller setinitialtext:message];     [controller addimage:image];     [self presentviewcontroller:controller animated:yes completion:nil]; 

2) twitter replace slservicetypefacebook slservicetypetwitter.

3) email

mfmailcomposeviewcontroller *emailsharecontroller = [[mfmailcomposeviewcontroller alloc] init];     emailsharecontroller.mailcomposedelegate = self;     [emailsharecontroller setsubject:@"share image"];     [emailsharecontroller setmessagebody:message ishtml:no];     [emailsharecontroller addattachmentdata:uiimagejpegrepresentation(image, 1) mimetype:@"image/jpeg" filename:@"your_image.jpeg"];     if (emailsharecontroller) [self presentviewcontroller:emailsharecontroller animated:yes completion:nil]; 

4) remember add social.framework project , following header files

#import <messageui/mfmailcomposeviewcontroller.h> #import <social/social.h> #import <mobilecoreservices/mobilecoreservices.h> 

5) set view controller delegate of

mfmailcomposeviewcontrollerdelegate

dismiss mailviewcontroller once mail send-

- (void)mailcomposecontroller:(mfmailcomposeviewcontroller *)controller didfinishwithresult:(mfmailcomposeresult)result error:(nserror *)error {     [self dismissviewcontrolleranimated:yes completion:nil]; }