How to allow user to pick the image with Swift?

Question

I am writing my first iOS application (iPhone only) with Swift. The main application view should allow user to choose the image from the photo gallery.

I\'ve found

Answer 1

For Swift 3:

1. First, you need to add the following key in info.plist:

       NSPhotoLibraryUsageDescription
   This app requires access to the photo library.
   

2. Your View controller needs to conform to the following protocols: UIImagePickerControllerDelegate, UINavigationControllerDelegate:

   class ImagePickerViewController:  UIViewController,UIImagePickerControllerDelegate, UINavigationControllerDelegate {}
   

3. You need to declare the UIImage you will be useing to bind the returned/selected image:

   @IBOutlet weak var myImageView: UIImageView!
   @IBoutlet weak var upLoadImageBtn:UIImage!
   let imagePicker = UIImagePickerController()
   

4. Set the pickerImage delegate to be your ViewController:

   imagePicker.delegate = self
   

5. For the upload button, you will need to link to the following image in order to fire the action and display the image picker:

   @IBAction func upLoadImageBtnPressed(_ sender: AnyObject) {
       imagePicker.allowsEditing = false
       imagePicker.sourceType = .photoLibrary
   
   
       /*
       The sourceType property wants a value of the enum named        UIImagePickerControllerSourceType, which gives 3 options:
   
       UIImagePickerControllerSourceType.PhotoLibrary
       UIImagePickerControllerSourceType.Camera
       UIImagePickerControllerSourceType.SavedPhotosAlbum
   
       */
       present(imagePicker, animated: true, completion: nil)
   
   }
   

6. Your View controller needs to implement the delegate methods for the image picker delegates:

   // MARK: - ImagePicker Delegate
   
   func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
   
       if let pickedImage = info[UIImagePickerControllerOriginalImage] as? UIImage {
           myImageView.contentMode = .scaleAspectFit
           myImageView.image = pickedImage
       }
   
   
       /*
   
       Swift Dictionary named “info”.  
       We have to unpack it from there with a key asking for what media information we want.
       We just want the image, so that is what we ask for.  For reference, the available options are:
   
       UIImagePickerControllerMediaType
       UIImagePickerControllerOriginalImage
       UIImagePickerControllerEditedImage
       UIImagePickerControllerCropRect
       UIImagePickerControllerMediaURL
       UIImagePickerControllerReferenceURL
       UIImagePickerControllerMediaMetadata
   
       */
       dismiss(animated: true, completion: nil)
   }
   
   func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
       dismiss(animated: true, completion:nil)
   }