Getting URL of UIImage from UIImagePickerController - ios

Question

I'm trying to get the URL of an image imported from Library in Swift to send it to Apple Watch with transferFile(_:metadata) but I'm having two error on NSURL.
This is my code:
func imagePickerController(picker: UIImagePickerController, didFinishPickingImage image: UIImage!, editingInfo: [NSObject : AnyObject]!)
{
imagePicked.image = image
let imageUrl = editingInfo[UIImagePickerControllerReferenceURL] as! NSURL
let imageName = imageUrl.path!.lastPathComponent
let documentDirectory = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true).first as String!
let localPath = documentDirectory.stringByAppendingPathComponent(imageName)
let image = editingInfo[UIImagePickerControllerOriginalImage]as! UIImage
let data = UIImagePNGRepresentation(image)
data!.writeToFile(localPath, atomically: true)
let photoURL = NSURL(fileURLWithPath: localPath)
self.dismissViewControllerAnimated(true, completion: nil);
}
And I'm getting error with *imageName and *localPath because it says that:
'lastPathComponent' is unavailable: Use lastPathComponent on NSURL instead.
'stringByAppendingPathComponent' is unavailable: Use URLByAppendingPathComponent on NSURL instead.
But I can't get it right in Swift 2.0 and Xcode 7. Where am I going wrong?

Answer 1

Apple has changed something in their NSString and NSURL library in their latest release (iOS 9), but those methods are available from iOS 4. You can check the related Apple Forum Post for more details.
For fixing this error, you need to change the code like:
Swift 2:
func imagePickerController(picker: UIImagePickerController, didFinishPickingImage image: UIImage!, editingInfo: [NSObject : AnyObject]!)
{
let imageUrl = editingInfo[UIImagePickerControllerReferenceURL] as! NSURL
let imageName = imageUrl.lastPathComponent
let documentDirectory = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true).first as String!
let photoURL = NSURL(fileURLWithPath: documentDirectory)
let localPath = photoURL.URLByAppendingPathComponent(imageName!)
let image = editingInfo[UIImagePickerControllerOriginalImage]as! UIImage
let data = UIImagePNGRepresentation(image)
data!.writeToFile(localPath.absoluteString, atomically: true)
self.dismissViewControllerAnimated(true, completion: nil);
}
Swift 3:
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any])
{
let imageUrl = info[UIImagePickerControllerReferenceURL] as! NSURL
let imageName = imageUrl.lastPathComponent
let documentDirectory = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true).first!
let photoURL = NSURL(fileURLWithPath: documentDirectory)
let localPath = photoURL.appendingPathComponent(imageName!)
let image = info[UIImagePickerControllerOriginalImage]as! UIImage
let data = UIImagePNGRepresentation(image)
do
{
try data?.write(to: localPath!, options: Data.WritingOptions.atomic)
}
catch
{
// Catch exception here and act accordingly
}
self.dismiss(animated: true, completion: nil);
}
Reference:
lastPathComponent
URLByAppendingPathComponent:

Answer 2

As of iOS 11, you can get the image URL from the info dictionary with the key UIImagePickerControllerImageURL.
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
let imageURL = info[UIImagePickerControllerImageURL] as? URL
}

Answer 3

func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [NSObject : AnyObject]) {
//this block of code grabs the path of the file
let imageURL = info[UIImagePickerControllerReferenceURL] as NSURL
let imagePath = imageURL.path!
let localPath = NSURL(fileURLWithPath: NSTemporaryDirectory()).URLByAppendingPathComponent(imagePath)
//this block of code adds data to the above path
let path = localPath.relativePath!
let imageName = info[UIImagePickerControllerOriginalImage] as UIImage
let data = UIImagePNGRepresentation(imageName)
data?.writeToFile(imagePath, atomically: true)
//this block grabs the NSURL so you can use it in CKASSET
let photoURL = NSURL(fileURLWithPath: path)
}