Faceadd

if (_launchOptions[UIApplicationLaunchOptionsURLKey] == nil) {
        [FBSDKAppLinkUtility fetchDeferredAppLink:^(NSURL *url, NSError *error) {
            DLog(@"fetchDeferredAppLink");
            DLog(@"url = %@， error = %@", url, error);
            if (error) {
                DLog(@"Received error while fetching deferred app link %@", error);
            }
            if (url) {
                [[UIApplication sharedApplication] openURL:url];
            }
        }];
    }