Accessing and using IOS camera

Question

Im trying to learn how to access and use the camera on IOS devices, trufully i cant find all that much info on it, at least not thats up to date or useful to learn at a beginner level.

Regardless, I've tried the below code but nothing happens when I click the button to open the camera it just freezes and does nothing, am i missing something or have i done something wrong?

import UIKit
import MobileCoreServices

class ViewController: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate {
    @IBOutlet weak var myImg: UIImageView!
    var newMedia: Bool!

    @IBAction func cameraRoll(_ sender: Any) {
        if UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.savedPhotosAlbum){
            let imagePicker = UIImagePickerController()

            imagePicker.delegate = self
            imagePicker.sourceType = UIImagePickerControllerSourceType.photoLibrary
            imagePicker.mediaTypes = [kUTTypeImage as String]
            imagePicker.allowsEditing = false
            self.present(imagePicker, animated: true, completion: nil)
            newMedia = false
        }
    }

    func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
        let mediaType = info[UIImagePickerControllerMediaType] as! NSString

        self.dismiss(animated: true, completion: nil)

        if mediaType.isEqual(to: kUTTypeImage as String){
            let image = info[UIImagePickerControllerOriginalImage] as! UIImage

            myImg.image = image

            if (newMedia == true) {
                UIImageWriteToSavedPhotosAlbum(image, self, #selector(ViewController.image(image:didFinishsavingWithError:contextInfo:)), nil)

            } else if mediaType.isEqual(to: kUTTypeMovie as String){
                //vid support
            }
        }
    }

    func image(image: UIImage, didFinishsavingWithError error: NSErrorPointer, contextInfo:UnsafeRawPointer){
        if error != nil {
            let alert = UIAlertController(title: "Save Failed", message: "Failed to save image", preferredStyle: UIAlertControllerStyle.alert)

            let cancelAction = UIAlertAction(title: "OK", style: .cancel, handler: nil)
            alert.addAction(cancelAction)
            self.present(alert, animated: true, completion: nil)
        }
    }

    func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
        self.dismiss(animated: true, completion: nil)
    }

    @IBAction func takePhoto(_ sender: Any) {

        if UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.camera){

            let imagePicker = UIImagePickerController()

            imagePicker.delegate = self
            imagePicker.sourceType = UIImagePickerControllerSourceType.photoLibrary
            imagePicker.mediaTypes = [kUTTypeImage as String]
            imagePicker.allowsEditing = false
            self.present(imagePicker, animated: true, completion:  nil)
            newMedia = false
        }     
    }

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
    }
}