ImagePickerPresenter

ImagePickerPresenter.swift

//
//  ImagePickerPresenter.swift
//  
//
//  Created by Bohdan Savych on 5/25/17.
//  Copyright © 2017 perpetio. All rights reserved.
//

import UIKit

protocol ImagePickerPresentable: UIImagePickerControllerDelegate, UINavigationControllerDelegate {
    func imagePickerPresenter(_ picker: UIImagePickerController, didFinishPicking image: UIImage)
    func imagePickerPresenterDidCancel(_ picker: UIImagePickerController)
}

final class ImagePickerPresenter<T: UIViewController>: NSObject, UIImagePickerControllerDelegate, UINavigationControllerDelegate where T: ImagePickerPresentable {
    fileprivate weak var delegate: T?
    fileprivate lazy var picker = UIImagePickerController()
    
    typealias PickerConfiguration = ((UIImagePickerController) -> Void)

    init(delegate: T) {
        self.delegate = delegate
        
        super.init()
        
        picker.delegate = self
    }
    
    func showImagePicker(type: UIImagePickerControllerSourceType, allowsEditing: Bool = true, animated: Bool = true, pickerConfiguration: PickerConfiguration? = nil) {
        picker.sourceType = type
        picker.allowsEditing = true
        pickerConfiguration?(picker)
        delegate?.present(picker, animated: animated, completion: nil)
    }
    
    func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
        let editedImage = info["UIImagePickerControllerEditedImage"] as? UIImage
        let image = info["UIImagePickerControllerOriginalImage"] as? UIImage
        delegate?.imagePickerPresenter(picker, didFinishPicking: editedImage ?? image!)
    }
    
    func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
        delegate?.imagePickerPresenterDidCancel(picker)
    }
}