UIImageView not showing transparency of PNG Images from UIImagePickerController

Question

I surely hope I am missing something because I do not understand why this is working the way it does. I have a PNG Image, which has a fully transparent background because I

Answer 1

Swift 3 version of answer by @Rob

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
    if let URL = info[UIImagePickerControllerReferenceURL] as? NSURL {
        let result = PHAsset.fetchAssets(withALAssetURLs: [URL as URL], options: nil)
        if let asset:PHAsset = result.firstObject! as PHAsset {
            let manager = PHImageManager.default()
            manager.requestImageData(for: asset, options: nil) { imageData, dataUTI, orientation, info in
                let fileURL = info!["PHImageFileURLKey"] as? NSURL
                let filename = fileURL?.lastPathComponent;

                // use imageData here
            }
        }
    }

    picker.dismiss(animated: true, completion: nil)

}