virality-customsharesheet.m

BranchLinkProperties *linkProperties = [[BranchLinkProperties alloc] init];
linkProperties.feature = @"sharing";
linkProperties.channel = @"facebook"; // make sure to specify the channel!
[linkProperties addControlParam:@"$desktop_url" withValue:@"http://example.com/video/12345"];

[branchUniversalObject getShortUrlWithLinkProperties:linkProperties andCallback:^(NSString *url, NSError *error) {
    if (!error && url) {
        // Drop the URL into your share message and let the user share it to the world
        NSLog(@"success getting url! %@", url);
    }
}];