How to store multiple images in NSUserDefaults picked through share extension - ios

Question

I currently did for single image which is working fine. But i want to pick multiple images and display in app.Can any one please help me in this. Thank you.
override func didSelectPost() {
if let content = extensionContext!.inputItems[0] as? NSExtensionItem {
let contentType = kUTTypeImage as String
if let contents = content.attachments as? [NSItemProvider] {
for attachment in contents {
if attachment.hasItemConformingToTypeIdentifier(contentType) {
attachment.loadItemForTypeIdentifier(contentType, options: nil) { data, error in
let url = data as! NSURL
if let imageData = NSData(contentsOfURL: url) {
self.saveImage(imageData)
}
}
}
}
}
}
// Unblock the UI.
self.extensionContext!.completeRequestReturningItems([], completionHandler: nil)
}
Saves an image to user defaults
func saveImage(imageData: NSData) {
if let prefs = NSUserDefaults(suiteName: suiteName) {
prefs.setObject(imageData, forKey: keyName)
}
}
Reading in app
if let prefs = NSUserDefaults(suiteName: suiteName) {
if let imageData = prefs.objectForKey(keyName) as? NSData {
drawCard(imageData)
}
}
And i modified this for array, but its not working.
override func didSelectPost() {
if let content = extensionContext!.inputItems[0] as? NSExtensionItem {
let contentType = kUTTypeImage as String
if let contents = content.attachments as? [NSItemProvider] {
for attachment in contents {
if attachment.hasItemConformingToTypeIdentifier(contentType) {
attachment.loadItemForTypeIdentifier(contentType, options: nil) { data, error in
let url = data as! NSURL
if let imageData = NSData(contentsOfURL: url) {
galleryBucket[url] = imageData
self.saveImage(galleryBucket)
}
}
}
}
}
}
// Unblock the UI.
self.extensionContext!.completeRequestReturningItems([], completionHandler: nil)
}
Saves an image to user defaults.
func saveImage(galleryBucket: [NSURL:NSData]) {
if let prefs = NSUserDefaults(suiteName: suiteName) {
prefs.setObject(galleryBucket, forKey: keyName)
}
}
Here I am getting nil for galleryBucket
if let prefs = NSUserDefaults(suiteName: suiteName) {
if let galleryBucket = prefs.objectForKey(keyName) as? [NSURL:NSData] {
for imageData in galleryBucket{
drawCard(imageData.1)
}
}
}

Answer 1

UserDefaults doesn't seem like the best place for saving images..
Take a look at this:
Save An Image To Application Documents Folder From UIView On IOS
And this is how you can search for a specific file extenstion.
Getting list of files in documents folder
And once you have a name, this is how you retrieve it.
Get image from documents directory swift