Collection view not displaying cells using custom object - ios

Question

I'm making an app that lets you record a video, then save it to the documents directory and a Post object, along with a thumbnail image. When I record a video and tap "use video", I see my print statements that the video was saved to the documents directory, and to the post object. However when I go to my collection view, which is set to display the thumbnail images from Post, it's empty. This is the function that handles saving the video and appending the Post object:
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
var posts = [Post]()
let mediaType = info[UIImagePickerControllerMediaType] as! NSString
dismiss(animated: true, completion: nil)
if mediaType == kUTTypeMovie {
var uniqueVideoID = ""
var videoURL:NSURL? = NSURL()
var uniqueID = ""
uniqueID = NSUUID().uuidString
// Get the path as URL and store the data in myVideoVarData
videoURL = info[UIImagePickerControllerMediaURL] as? URL as NSURL?
let myVideoVarData = try! Data(contentsOf: videoURL! as URL)
// Write data to temp diroctory
let tempPath = NSSearchPathForDirectoriesInDomains(FileManager.SearchPathDirectory.documentDirectory, FileManager.SearchPathDomainMask.userDomainMask, true)
let tempDocumentsDirectory: AnyObject = tempPath[0] as AnyObject
uniqueVideoID = uniqueID + "TEMPVIDEO.MOV"
let tempDataPath = tempDocumentsDirectory.appendingPathComponent(uniqueVideoID) as String
try? myVideoVarData.write(to: URL(fileURLWithPath: tempDataPath), options: [])
//Getting the time value of the movie.
let fileURL = URL(fileURLWithPath: tempDataPath)
let asset = AVAsset(url: fileURL)
let duration : CMTime = asset.duration
//Now we remove the data from the temp Document Diroctory.
do{
let fileManager = FileManager.default
try fileManager.removeItem(atPath: tempDataPath)
} catch {
//Do nothing
}
// Check to see if video is under the 18500 (:30 seconds)
if duration.value <= 18500 {
// Write the data to the Document Directory for use later on
let docPaths = NSSearchPathForDirectoriesInDomains(FileManager.SearchPathDirectory.documentDirectory, FileManager.SearchPathDomainMask.userDomainMask, true)
let documentsDirectory: AnyObject = docPaths[0] as AnyObject
uniqueVideoID = uniqueID + "VIDEO.MOV"
let docDataPath = documentsDirectory.appendingPathComponent(uniqueVideoID) as String
try? myVideoVarData.write(to: URL(fileURLWithPath: docDataPath), options: [])
print("docDataPath under picker ",docDataPath)
print("Video saved to documents directory")
//Create a thumbnail image from the video
let assetImageGenerate = AVAssetImageGenerator(asset: asset)
assetImageGenerate.appliesPreferredTrackTransform = true
let time = CMTimeMake(asset.duration.value / 3, asset.duration.timescale)
//Add thumbnail & video path to Post object
if let videoImage = try? assetImageGenerate.copyCGImage(at: time, actualTime: nil) {
let video = Post(pathToVideo: docDataPath, thumbnail: UIImage(cgImage: videoImage))
posts.append(video)
print("Video saved to Post object")
}
}else{
print("Video not saved")
}
}
}
If I set a breakpoint I can see that Post does indeed have one value after the save, so I'm not sure why the CV isn't displaying the thumbnail.
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "postCell", for: indexPath) as! PostCell
cell.postImage.image = posts[indexPath.row].thumbnail
cell.postImage.contentMode = UIViewContentMode.scaleAspectFill
return cell
}
Post Object:
class Post: NSObject {
var thumbnail: UIImage!
var pathToVideo: String!
init(pathToVideo: String, thumbnail: UIImage) {
self.pathToVideo = pathToVideo
self.thumbnail = thumbnail
}
}
Can anyone see what's going wrong?

Answer 1

Do you have a singleton VideoFeedController? What are you trying to accomplish by doing this:
let feed = VideoFeedController()
feed.collectionView?.reloadData()
Seems to me you are reloading an instance of the VideoFeedController that is never displayed anywhere.
if your image picking function is within the VideoFeedController you could simply call
self.collectionView?.reloadData()
but if not, then you could try overriding viewDidAppear inside the VideoFeedController and reload the collectionView there, i.e. add this to the VideoFeedController
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
self.collectionView?.reloadData()
}