Getting URL of UIImage from UIImagePickerController

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:

1. lastPathComponent
2. URLByAppendingPathComponent: