Accessing images in DocumentDirectory iOS and UICollectionView - ios

Question

In my app, the user selects an image from camera roll, and it is saved in a document directory. The image is then displayed on the ViewController where they selected the image. I want the image to be appended to a UICollectionView. How can I access the image/append the image from the documentDirectory? Please see my code below. Let me know if you need other pieces of my project.
DetailViewController(Where I initially display the photo):
class DetailViewController: UIViewController, UITextFieldDelegate, UINavigationControllerDelegate, UIImagePickerControllerDelegate {
...
var imageStore: ImageStore!
#IBAction func takePicture(sender: UIBarButtonItem) {
let imagePicker = UIImagePickerController()
if UIImagePickerController.isSourceTypeAvailable(.Camera) {
imagePicker.sourceType = .Camera
} else {
imagePicker.sourceType = .PhotoLibrary
}
imagePicker.delegate = self
presentViewController(imagePicker, animated: true, completion: nil)
}
func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String: AnyObject]) {
let image = info[UIImagePickerControllerOriginalImage] as! UIImage
imageStore.setImage(image, forKey: item.itemKey)
imageView.image = image
dismissViewControllerAnimated(true, completion: nil)
}
override func viewWillAppear(animated: Bool) {
super.viewWillAppear(animated)
let key = item.itemKey
if let imageToDisplay = imageStore.imageForKey(key) {
imageView.image = imageToDisplay
}
}
ImageStore(How I initially store the photo):
import UIKit
class ImageStore: NSObject {
let cache = NSCache()
func setImage(image: UIImage, forKey key: String) {
cache.setObject(image, forKey: key)
let imageURL = imageURLForKey(key)
if let data = UIImageJPEGRepresentation(image, 0.5) {
data.writeToURL(imageURL, atomically: true)
}
}
func imageForKey(key: String) -> UIImage? {
if let existingImage = cache.objectForKey(key) as? UIImage {
return existingImage
}
let imageURL = imageURLForKey(key)
guard let imageFromDisk = UIImage(contentsOfFile: imageURL.path!) else {
return nil
}
cache.setObject(imageFromDisk, forKey: key)
return imageFromDisk
}
func deleteImageForKey(key: String) {
cache.removeObjectForKey(key)
let imageURL = imageURLForKey(key)
do {
try NSFileManager.defaultManager().removeItemAtURL(imageURL)
}
catch let deleteError {
print("Error removing the image from disk: \(deleteError)")
}
}
func imageURLForKey(key: String) -> NSURL {
let documentsDirectories =
NSFileManager.defaultManager().URLsForDirectory(.DocumentDirectory, inDomains: .UserDomainMask)
let documentDirectory = documentsDirectories.first!
return documentDirectory.URLByAppendingPathComponent(key)
}
}
UICollectionView:
import UIKit
class PhotosViewController: UIViewController, UICollectionViewDelegate, UICollectionViewDataSource {
var collectionView: UICollectionView!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
let layout: UICollectionViewFlowLayout = UICollectionViewFlowLayout()
layout.sectionInset = UIEdgeInsets(top: 10, left: 10, bottom: 10, right: 10)
layout.itemSize = CGSize(width: 300, height: 490)
collectionView = UICollectionView(frame: self.view.frame, collectionViewLayout: layout)
collectionView.dataSource = self
collectionView.delegate = self
collectionView!.registerClass(FoodCell.self, forCellWithReuseIdentifier: "Cell")
collectionView.backgroundColor = UIColor.whiteColor()
self.view.addSubview(collectionView)
}
override func viewWillAppear(animated: Bool) {
super.viewWillAppear(animated)
}
func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return images.count
}
var images: [UIImage] = [
]
func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCellWithReuseIdentifier("Cell", forIndexPath: indexPath) as! FoodCell
cell.textLabel.text = ""
cell.imageView.image = images[indexPath.row]
return cell
}
func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath)
{
print("User tapped on item \(indexPath.row)")
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}

Answer 1

You can try to save and get your image by this way:
//Save image
let img = UIImage() // Image from your picker
let data = UIImagePNGRepresentation(img)!
do {
let documentsPath = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)[0] as String
try data.writeToFile("\(documentsPath)myImage", options: [])
} catch {
print("Error")
}
// Get image
do {
let documentsPath = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)[0] as String
let readData = try NSData(contentsOfFile: "\(documentsPath)myImage", options: [])
let retreivedImage = UIImage(data: readData)
}
catch {
print("Error")
}
Same way as https://stackoverflow.com/a/35685943/2894160