ios7 - UIActivityViewController progress & result -

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i using uiactivityviewcontroller save bunch of video assets user's camera roll, problem there no way know whether save photo library successful or not, , error code if unsuccessful. there way override default behavior of builtin activity? see completionhandler of uiactivityviewcontroller pretty useless in regard.

use completionblock do.

alassetslibrary *lib = [[[alassetslibrary alloc] init] autorelease]; if ([lib videoatpathiscompatiblewithsavedphotosalbum:videourl]) {    [lib writevideoatpathtosavedphotosalbum:videourl       completionblock:^(nsurl *asseturl, nserror *error) {        if (!error)        {          [self performselectoronmainthread: @selector(dismissalertview) withobject: nil, waituntildone:no];       }   }]; }  - (void)dismissalertview {    //dismiss alertview here. }

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