CODEWITHSUNDEEP
videoswift3photoscollectionview
Jaisan Mathew
Jaisan Mathew

Reputation: 81

Load video and Photos in PhotoLibrary to a collection view

I'm trying to load all videos and photos from photo library to a collectionView. I got code from stackOver flow link here. But it's crashing with in the viewwillAppear function saying found nil while unwrapping optional value. I tried it in both device and simulator. I'm adding the same code below.

import UIKit
import Photos


class TestViewController: UIViewController, UICollectionViewDataSource, UICollectionViewDelegate, UIImagePickerControllerDelegate {

@IBOutlet weak var cameraRollCollectionView: UICollectionView!

var assetCollection: PHAssetCollection!
var photosAsset: PHFetchResult<AnyObject>!
var assetThumbnailSize: CGSize!

override func viewDidLoad() {
    super.viewDidLoad()

    let fetchOptions = PHFetchOptions()

    let collection:PHFetchResult = PHAssetCollection.fetchAssetCollections(with: .album, subtype: .any, options: fetchOptions)

    if let first_Obj:AnyObject = collection.firstObject{
        //found the album
        self.assetCollection = first_Obj as! PHAssetCollection
    }
}

override func viewWillAppear(_ animated: Bool) {
    // Get size of the collectionView cell for thumbnail image
    if let layout = self.cameraRollCollectionView!.collectionViewLayout as? UICollectionViewFlowLayout{
        let cellSize = layout.itemSize

        self.assetThumbnailSize = CGSize(width: cellSize.width, height: cellSize.height)
    }

    //fetch the photos from collection
    self.photosAsset = (PHAsset.fetchAssets(in: self.assetCollection, options: nil) as AnyObject!) as! PHFetchResult<AnyObject>!


    self.cameraRollCollectionView!.reloadData()

}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}


// MARK: UICollectionViewDataSource

func numberOfSections(in collectionView: UICollectionView) -> Int {
    // #warning Incomplete implementation, return the number of sections
    return 1
}


func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
    // #warning Incomplete implementation, return the number of items
    var count: Int = 0

    if(self.photosAsset != nil){
        count = self.photosAsset.count
    }

    return count;
}


func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {

    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cameraCell", for: indexPath as IndexPath) as! UserImagesCollectionViewCell

    //Modify the cell
    let asset: PHAsset = self.photosAsset[indexPath.item] as! PHAsset

    PHImageManager.default().requestImage(for: asset, targetSize: self.assetThumbnailSize, contentMode: .aspectFill, options: nil, resultHandler: {(result, info)in
        if result != nil {
            cell.userImage.image = result
        }
    })

    return cell
}

// MARK: - UICollectionViewDelegateFlowLayout methods
func collectionView(collectinView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAtIndex section: Int) -> CGFloat {
    return 4
}

func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumInteritemSpacingForSectionAtIndex section: Int) -> CGFloat {
    return 1
}

// UIImagePickerControllerDelegate Methods
func imagePickerControllerDidCancel(_ picker: UIImagePickerController){
    picker.dismiss(animated: true, completion: nil)
}

}

The crash point is : 

 //fetch the photos from collection
self.photosAsset = (PHAsset.fetchAssets(in: self.assetCollection, options: nil) as AnyObject!) as! PHFetchResult<AnyObject>!

Please please help me to with this.

Thank you

Upvotes: 1

Views: 2875

Answers (2)

Krunal Patel
Krunal Patel

Reputation: 1691

Please try to .moment instead of .album. That is work for me in Swift 4.

let collection : PHFetchResult = PHAssetCollection.fetchAssetCollections(with: .moment, subtype: .any, options: fetchOptions)

Upvotes: 1

xhg
xhg

Reputation: 1885

  1. Make sure that you have the "Privacy - Photo Library Usage Description" in your "Info.plist". (See image below) This step will enable your App to ask for Photo Library permission.

Privacy - Photo Library Usage Description

  1. Make sure you have at least one "Album" in your photo library. Or you might consider change the line PHAssetCollection.fetchAssetCollections(with: .album, subtype: .any, ... to PHAssetCollection.fetchAssetCollections(with: .smartAlbum, subtype: .any, .... "SmartAlbum" can find "CameraRoll".

Good luck!

Upvotes: 1

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