The collectionView pictures only start appearing if I slide them horizontally to the left. I've tried numerous solutions but couldn't solve it. If I assign the collectionView cells a background color, it works perfectly. But assigning the image of the "photoImageView" causes the problem. I must be missing something. "collectionView.reloadData()" doesn't solve the problem. Any advice please ?
import Foundation
import UIKit
import Photos
class PhotoViewController: UIViewController {
@IBOutlet weak var photoImageView: UIImageView!
@IBOutlet weak var peeTabBar: UITabBar!
@IBOutlet var photoView: UIView!
var imagePicker = UIImagePickerController()
override func viewDidLoad() {
super.viewDidLoad()
imagePicker.delegate = self
assignTap()
view.addSubview(collectionView)
collectionView.backgroundColor = .white
collectionView.topAnchor.constraint(equalTo: photoImageView.bottomAnchor, constant: 110).isActive = true
collectionView.clipsToBounds = true
collectionView.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 10).isActive = true
collectionView.trailingAnchor.constraint(equalTo: view.trailingAnchor, constant: 10).isActive = true
collectionView.bottomAnchor.constraint(equalTo: peeTabBar.topAnchor, constant: -20).isActive = true
collectionView.dataSource = self
collectionView.delegate = self
}
func assignTap() {
let tap = UITapGestureRecognizer(target: self, action: #selector(touchTapped(_:)))
photoView.addGestureRecognizer(tap)
}
@objc func touchTapped(_ sender: UITapGestureRecognizer) {
peeTabBar.isHidden = !peeTabBar.isHidden
}
func chooseImage(_ sender: Any) {
if UIImagePickerController.isSourceTypeAvailable(.photoLibrary) {
imagePicker.sourceType = .photoLibrary
imagePicker.allowsEditing = true
self.present(imagePicker,animated: true, completion: nil)
}
}
func accessVideo(_ sender: Any) {
if UIImagePickerController.isSourceTypeAvailable(.camera) {
imagePicker.sourceType = .camera
self.present(imagePicker, animated: true, completion: nil)
} else {
print("Camera not available")
}
}
public func chooseLastImage(_ sender: Any) {
print("photoImageView", photoImageView!)
print("photoImageView.bounds", photoImageView.bounds)
let targetSize: CGSize? = CGSize(width: photoImageView.bounds.width, height: photoImageView.bounds.height)
let options = PHImageRequestOptions()
options.isNetworkAccessAllowed = true
options.deliveryMode = .highQualityFormat
let imgManager = PHImageManager.default()
let fetchOptions = PHFetchOptions()
fetchOptions.sortDescriptors = [NSSortDescriptor(key:"creationDate", ascending: true)]
let fetchResult: PHFetchResult = PHAsset.fetchAssets(with: .image, options: fetchOptions)
print("targetSize for request", targetSize!) //What is its value
imgManager.requestImage(for: fetchResult.lastObject!, targetSize: targetSize!, contentMode: .default, options: options) { (result, info) in
guard let result = result else { return }
DispatchQueue.main.async(execute: {
self.photoImageView.image = result
})
}
}
fileprivate let collectionView: UICollectionView = {
let layout = UICollectionViewFlowLayout()
layout.scrollDirection = .horizontal
let cv = UICollectionView(frame: .zero, collectionViewLayout: layout)
cv.translatesAutoresizingMaskIntoConstraints = false
cv.register(CustomCell.self, forCellWithReuseIdentifier: "PreviewCell")
return cv
}()
}
extension PhotoViewController: UICollectionViewDelegateFlowLayout, UICollectionViewDataSource {
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
return CGSize(width: collectionView.frame.width/5, height: collectionView.frame.width/4)
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return 11
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "PreviewCell", for: indexPath) as! CustomCell
DispatchQueue.main.async {
cell.bgImage = self.photoImageView.image
}
return cell
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAt section: Int) -> UIEdgeInsets {
return UIEdgeInsets(top: 10, left: 5, bottom: 10, right: 5)
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumInteritemSpacingForSectionAt section: Int) -> CGFloat {
return 5
}
}
class CustomCell: UICollectionViewCell {
fileprivate let bg: UIImageView = {
let iv = UIImageView()
iv.translatesAutoresizingMaskIntoConstraints = false
iv.contentMode = .scaleAspectFit
iv.clipsToBounds = true
return iv
}()
var bgImage: UIImage? {
get {
bg.image
}
set {
bg.image = newValue
}
}
override init(frame: CGRect) {
super.init(frame: frame)
contentView.addSubview(bg)
bg.topAnchor.constraint(equalTo: contentView.topAnchor).isActive = true
bg.leadingAnchor.constraint(equalTo: contentView.leadingAnchor).isActive = true
bg.trailingAnchor.constraint(equalTo: contentView.trailingAnchor).isActive = true
bg.bottomAnchor.constraint(equalTo: contentView.bottomAnchor).isActive = true
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}
extension PhotoViewController: UIImagePickerControllerDelegate, UINavigationControllerDelegate {
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
if let image = info[UIImagePickerController.InfoKey.originalImage] as? UIImage {
photoImageView.image = image
}
dismiss(animated: true, completion: nil)
}
func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
dismiss(animated: true, completion: nil)
}
}
