[swift] カメラロールの写真を選択して新しい画面で表示する

##サンプル
カメラロール開く → 新規画面に選択した写真表示 → 閉じる　という流れ。

##コード

ViewController.swift

import UIKit

class ViewController: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate {

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

    @IBAction func toAlbum(){
        if UIImagePickerController.isSourceTypeAvailable(.savedPhotosAlbum) {
            let picker = UIImagePickerController()
            picker.sourceType = .photoLibrary
            picker.delegate = self
            self.present(picker, animated: true, completion: nil)
        }
    }
    
    func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
        let image = info[UIImagePickerControllerOriginalImage] as! UIImage
        
        let storyboard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
        let nextView = storyboard.instantiateViewController(withIdentifier: "Photo") as! PhotoViewController
        nextView.image = image
        
        self.dismiss(animated: false)
        present(nextView, animated: true, completion: nil)
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

}

PhotoViewController.swift

import UIKit

class PhotoViewController: UIViewController {
    
    var image: UIImage?

    @IBOutlet weak var imageView: UIImageView!
    
    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view.
        
        imageView.image = image
        imageView.contentMode = UIViewContentMode.scaleAspectFit
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
    
    @IBAction func closeModal() {
        imageView.image = nil
        self.dismiss(animated: true, completion: nil)
    }

}

Storyboardで各ViewControllerのidentifierにMainとPhotoを設定するのを忘れないように。

##ダウンロード
githubに置いてあります。