How to write native photo picker

To write a native photo picker, you can use the PhotoKit framework provided by Apple. Here are the steps to implement a photo picker in your app:

1. Import the PhotoKit framework:

   import PhotosUI
   

2. Create a PHPickerViewController:

   var configuration = PHPickerConfiguration()
   configuration.selectionLimit = 1 // Set the limit to the number of photos you want to pick
   let picker = PHPickerViewController(configuration: configuration)
   picker.delegate = self
   

3. Present the picker:

   present(picker, animated: true, completion: nil)
   

4. Implement the delegate method to handle the selected photos:

   extension YourViewController: PHPickerViewControllerDelegate {
       func picker(_ picker: PHPickerViewController, didFinishPicking results: [PHPickerResult]) {
           picker.dismiss(animated: true, completion: nil)
           for result in results {
               result.itemProvider.loadObject(ofClass: UIImage.self) { (object, error) in
                   if let image = object as? UIImage {
                       DispatchQueue.main.async {
                           // Use the selected image
                           self.imageView.image = image
                       }
                   }
               }
           }
       }
   }
   

For more detailed information on working with PhotoKit, you can refer to the session Build a great Lock Screen camera capture experience from WWDC 2024. This session covers various aspects of capturing and handling photos and videos, including permissions and best practices.