iOS not saving all images - ios

Question

In my app I have a button. If you tap it you can download a couple of images (13) to your photo library.
I created an array that holds the images, named "1", "2", "3", "4", etc. like this: (I checked, the array holds all 13 images)
var myPhotos: NSMutableArray = []
for i in 1...13 {
let img = UIImage(named: "\(i)")!
myPhotos.addObject(img)
}
I then save all the images to the photo library:
var photo = UIImage()
var j = 0
for photo in myPhotos {
j++
UIImageWriteToSavedPhotosAlbum(photo as! UIImage, nil, nil, nil)
}
print(j)
print("done")
In the photo library of my simulator there are all the 13 images. When running this on my iPad that number varies a lot, from like 8 to 12 but never 13. That's why I put j there. It proves that the loop runs all the way through the array (j is 13 in the console) and "done" is also being printed.
What is the problem here?
Thanks in advance :)

Answer 1

this should work:
class ViewController: UIViewController {
var myPhotos = [UIImage]()
var savedPhotos = 0
override func viewDidLoad() {
super.viewDidLoad()
// setup photos
for i in 1...13 {
let img = UIImage(named: "\(i).jpg")! // remove the ".jpg" for you to work
myPhotos.append(img)
}
// save photos
saveNextPhotoToPhotosAlbum()
}
func saveNextPhotoToPhotosAlbum() {
if let photo = myPhotos.first {
UIImageWriteToSavedPhotosAlbum(photo, self, "image:didFinishSavingWithError:contextInfo:", nil)
}
}
func image(image: UIImage, didFinishSavingWithError error: NSErrorPointer, contextInfo:UnsafePointer<Void>) {
if error == nil {
print("saved \(++savedPhotos). photo")
myPhotos.removeFirst()
saveNextPhotoToPhotosAlbum()
}
}
}
in my case i used .jpg images so maybe you have to remove the extension in the for loop to make it work for you!