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:

Import the PhotoKit framework:
```
import PhotosUI
```

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

Present the picker:

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

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.