shareVideoToFacebook.m

// import them, FacebookSDK.framework, FBSDKLoginKit.framework, FBSDKShareKit.framework, Bolts.framework,FBSDKCoreKit.framework
- (void)shareVideoToFacebook {
    if(![FBSDKAccessToken currentAccessToken]) {
        FBSDKLoginManager *login1 = [[FBSDKLoginManager alloc]init];
        [login1 logInWithPublishPermissions:@[@"publish_actions"] handler:^(FBSDKLoginManagerLoginResult *result, NSError *error) {
            FBSDKShareVideo *video = [[FBSDKShareVideo alloc] init];
            video.videoURL = videoAssetURL;
            FBSDKShareVideoContent *content = [[FBSDKShareVideoContent alloc] init];
            content.video = video;
            [FBSDKShareDialog showFromViewController:self withContent:content delegate:nil];
        }];
    }
    else {
        FBSDKShareVideo *video = [[FBSDKShareVideo alloc] init];
        video.videoURL = videoAssetURL;
        FBSDKShareVideoContent *content = [[FBSDKShareVideoContent alloc] init];
        content.video = video;
        [FBSDKShareDialog showFromViewController:self withContent:content delegate:nil];
    }
}

- (void)writeVideoToAlbum {
    NSURL *movieURL = [NSURL URLWithString:[[NSBundle mainBundle] pathForResource:@"moviename" ofType:@"mov"]];
    // NSURL *movieURL = [NSURL URLWithString:[[NSHomeDirectory() stringByAppendingPathComponent:@"Library/Caches"] stringByAppendingFormat:@"/movie.mov"]];
    ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];
    [library writeVideoAtPathToSavedPhotosAlbum:movieURL  completionBlock:^(NSURL *assetURL, NSError *error) {
        videoAssetURL =assetURL;
        
 }];
}