Flurry iOS Native Ad view composition

FlurryiOSNativeAdViewComposition.swift

func adNativeDidFetchAd(nativeAd: FlurryAdNative!) {
   NSLog("Native Ad for Space \(nativeAd.space) Received Ad with \(nativeAd.assetList.count) assets");
      for asset in nativeAd.assetList {
         switch(asset.name) {
            case "headline":
                streamTitleLabel.text = asset.value;
            
            case "summary":
                streamDescriptionLabel.text = asset.value;
            
            case "secImage":
                if let url = NSURL(string: asset.value!!) {
                    if let imageData = NSData(contentsOfURL: url) {
                        streamImageView.image = UIImage(data: imageData);
                    }
            }
            
            case "source":
                streamSourceLabel.text = asset.value;
            
            case "secHqBrandingLogo":
                if let url = NSURL(string: asset.value!!) {
                    if let imageData = NSData(contentsOfURL: url) {
                        streamSponsoredImageView.image = UIImage(data: imageData);
                    }
            }
            
            default: ();
      }
   }
}

nativeAd.space and nativeAd.assetList will are guaranteed to be non-nil, as this method is a callback function which is called on successfully fetching an ad.

As for using the native for-in syntax, I'll update the gist with your respective changes.