default imagePicker for iOS camera

CameraHelper.swift

//  Created by SuStinge on 12/02/2018.
import UIKit
import Foundation
import AVFoundation
import MobileCoreServices

class CameraHelper: NSObject {
    public static let imagePicker = UIImagePickerController()
    
    fileprivate let isCameraAvailable = UIImagePickerController.isSourceTypeAvailable(.camera)
    fileprivate let isRearCameraAvailable = UIImagePickerController.isCameraDeviceAvailable(.rear)
    fileprivate let isFrontCameraAvailable = UIImagePickerController.isCameraDeviceAvailable(.front)
    
    fileprivate let sourceTypeCamera = UIImagePickerControllerSourceType.camera
    fileprivate let rearCamera = UIImagePickerControllerCameraDevice.rear
    fileprivate let frontCamera = UIImagePickerControllerCameraDevice.front
    
    var delegate: UINavigationControllerDelegate & UIImagePickerControllerDelegate
    var takePhotoIndex: Int?
    
    init(delegate: UINavigationControllerDelegate & UIImagePickerControllerDelegate) {
        self.delegate = delegate
    }
    
    func prepareImagePicker() {
        if !isCameraAvailable {
            return
        }
        
        let type = kUTTypeImage as String
        if let availableTypes = UIImagePickerController.availableMediaTypes(for: .camera) {
            if availableTypes.contains(type) {
                CameraHelper.imagePicker.mediaTypes = [type]
                CameraHelper.imagePicker.sourceType = sourceTypeCamera
            }
        }
        
        if isRearCameraAvailable {
            CameraHelper.imagePicker.cameraDevice = rearCamera
        } else if isFrontCameraAvailable {
            CameraHelper.imagePicker.cameraDevice = frontCamera
        }
        
        CameraHelper.imagePicker.allowsEditing = true
        CameraHelper.imagePicker.showsCameraControls = true
        CameraHelper.imagePicker.delegate = delegate
        print("camera ready to present")
    }
    
    func getCameraOn(_ onVC: UIViewController, _ index: Int? = nil) {
        if !isCameraAvailable {
            return
        }
        takePhotoIndex = index
        onVC.present(CameraHelper.imagePicker, animated: true, completion: nil)
    }
}