added helper file

image picker, call, message, email, alertProtocol

Helper/AlertProtocol.swift

@@ -0,0 +1,45 @@
+//
+//  AlertProtocol.swift
+//  VariousManagerDemoApp
+//
+//  Created by JungpyoHong on 4/21/21.
+//
+
+import UIKit
+
+enum AlertButton: String {
+    case ok
+    case cancel
+    case delete
+    case settings
+}
+
+protocol AlertProtocol: UIViewController {
+    func showAlert(title: String, message: String, buttons: [AlertButton], completion: @escaping (UIAlertController, AlertButton) -> Void)
+}
+
+extension AlertProtocol {
+    
+    func showAlert(title: String, message: String, buttons: [AlertButton] = [.ok], completion: @escaping (UIAlertController, AlertButton) -> Void) {
+        
+        let alert = UIAlertController(title: title, message: message, preferredStyle: .alert)
+        
+        buttons.forEach { button in
+            let action = UIAlertAction(title: button.rawValue.capitalized, style: button == .delete ? .destructive : .default) { [alert, button] _ in
+                completion(alert, button)
+            }
+            alert.addAction(action)
+        }
+        self.present(alert, animated: true, completion: nil)
+    }
+}
+
+protocol CellReusable {
+    static var identifier: String { get }
+}
+
+extension CellReusable {
+    static var identifier: String {
+        String(describing: self)
+    }
+}

Helper/ConversationManager.swift

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+//
+//  ConversationManager.swift
+//  VariousManagerDemoApp
+//
+//  Created by JungpyoHong on 4/20/21.
+//
+
+import Foundation
+import MessageUI
+import UIKit
+
+struct MailFeedback {
+    let recipients: [String]
+    let subject: String
+    let body: String
+}
+
+struct MessageFeedBack {
+    let recipients: [String]
+    let body: String
+}
+
+class ConversationManager: NSObject {
+    
+    private weak var mailDelegate: MFMailComposeViewControllerDelegate?
+    private let mailController: MFMailComposeViewController
+    
+    private weak var messageDelegate: MFMessageComposeViewControllerDelegate?
+    private let messageController: MFMessageComposeViewController
+    
+    init(presentingController controller: NSObject, mailDelegate: MFMailComposeViewControllerDelegate, messageDelegate: MFMessageComposeViewControllerDelegate) {
+        self.mailDelegate = mailDelegate
+        self.mailController = MFMailComposeViewController()
+        self.messageDelegate = messageDelegate
+        self.messageController = MFMessageComposeViewController()
+            
+        super.init()
+        messageController.messageComposeDelegate = self
+        mailController.mailComposeDelegate = self
+    }
+    
+    func sendEmail(feedback: MailFeedback) -> MFMailComposeViewController {
+        if MFMailComposeViewController.canSendMail() {
+            self.mailDelegate = self
+            mailController.setToRecipients(feedback.recipients)
+            mailController.setSubject(feedback.subject)
+            mailController.setMessageBody(feedback.body, isHTML: false)
+        }
+        return mailController
+    }
+    
+    func sendMessage(feedback: MessageFeedBack) -> MFMessageComposeViewController {
+        if MFMessageComposeViewController.canSendText() {
+            self.mailDelegate = self
+            messageController.recipients = feedback.recipients
+            messageController.body = feedback.body
+        }
+        return messageController
+    }
+    
+    func makeCall(number: String) {
+        let number = number
+        guard let url = URL(string: "tel://\(number)") else { return }
+        if UIApplication.shared.canOpenURL(url) {
+            UIApplication.shared.open(url, options: [:], completionHandler: nil)
+        }
+    }
+}
+extension ConversationManager: MFMailComposeViewControllerDelegate {
+    func mailComposeController(_ controller: MFMailComposeViewController, didFinishWith result: MFMailComposeResult, error: Error?) {
+        controller.dismiss(animated: true, completion: nil)
+    }
+}
+
+extension ConversationManager: MFMessageComposeViewControllerDelegate {
+    func messageComposeViewController(_ controller: MFMessageComposeViewController, didFinishWith result: MessageComposeResult) {
+        controller.dismiss(animated: true, completion: nil)
+    }
+}

Helper/ImagePicker.swift

@@ -0,0 +1,92 @@
+//
+//  ImagePicker.swift
+//  VariousManagerDemoApp
+//
+//  Created by JungpyoHong on 4/21/21.
+//
+
+import UIKit
+
+public protocol ImagePickerDelegate: AnyObject {
+    func didSelect(image: UIImage?)
+}
+
+open class ImagePicker: NSObject {
+    
+    private let imagePicker: UIImagePickerController
+    private weak var presentationController: UIViewController?
+    private weak var delegate: ImagePickerDelegate?
+    
+    public init(presentationController: UIViewController, delegate: ImagePickerDelegate) {
+        self.imagePicker = UIImagePickerController()
+        
+        super.init()
+        
+        self.presentationController = presentationController
+        self.delegate = delegate
+        
+        self.imagePicker.delegate = self
+        self.imagePicker.allowsEditing = true
+        self.imagePicker.mediaTypes = ["public.image"]
+    }
+    
+    private func action(for type: UIImagePickerController.SourceType, title: String) -> UIAlertAction? {
+        guard UIImagePickerController.isSourceTypeAvailable(type) else {
+            return nil
+        }
+        
+        return UIAlertAction(title: title, style: .default) { [weak self] _ in
+            self?.imagePicker.sourceType = type
+            self?.presentationController?.present(self?.imagePicker ?? UIImagePickerController(), animated: true)
+        }
+    }
+    
+    public func present(from sourceView: UIView) {
+        
+        let alertController = UIAlertController(title: nil, message: nil, preferredStyle: .actionSheet)
+        
+        if let action = self.action(for: .camera, title: "Take photo") {
+            alertController.addAction(action)
+        }
+        if let action = self.action(for: .savedPhotosAlbum, title: "Camera roll") {
+            alertController.addAction(action)
+        }
+        if let action = self.action(for: .photoLibrary, title: "Photo library") {
+            alertController.addAction(action)
+        }
+        
+        alertController.addAction(UIAlertAction(title: "Cancel", style: .cancel, handler: nil))
+        
+//        if UIDevice.current.userInterfaceIdiom == .pad {
+//            alertController.popoverPresentationController?.sourceView = sourceView
+//            alertController.popoverPresentationController?.sourceRect = sourceView.bounds
+//            alertController.popoverPresentationController?.permittedArrowDirections = [.down, .up]
+//        }
+        
+        self.presentationController?.present(alertController, animated: true)
+    }
+    
+    private func pickerController(_ controller: UIImagePickerController, didSelect image: UIImage?) {
+        controller.dismiss(animated: true, completion: nil)
+        
+        self.delegate?.didSelect(image: image)
+    }
+}
+
+extension ImagePicker: UIImagePickerControllerDelegate {
+    
+    public func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
+        self.pickerController(picker, didSelect: nil)
+    }
+    
+    public func imagePickerController(_ picker: UIImagePickerController,
+                                      didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey: Any]) {
+        guard let image = info[.editedImage] as? UIImage else {
+            return self.pickerController(picker, didSelect: nil)
+        }
+        self.pickerController(picker, didSelect: image)
+    }
+}
+
+extension ImagePicker: UINavigationControllerDelegate {
+}