UIImagePickerControllerでライブラリから画像を選択

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AppDelegate.swift

Swift 5.x/4.x

//
//  AppDelegate.swift
//  UIKit051_4.0
//
//  Created by KimikoWatanabe on 2016/08/21.
//  Copyright © 2016年 FaBo, Inc. All rights reserved.
//

import UIKit

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?
    var myViewController: UIViewController?

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey : Any]? = nil) -> Bool {
        //ViewControllerのインスタンス化
        myViewController = ViewController()

        //UINavigationControllerのインスタンス化とrootViewControllerの指定
        let myNavigationController = UINavigationController(rootViewController: myViewController!)

        //UIWindowのインスタンス化
        self.window = UIWindow(frame: UIScreen.main.bounds)

        //UIWindowのrootViewControllerにnavigationControllerを指定
        self.window?.rootViewController = myNavigationController

        //UIWindowの表示
        self.window?.makeKeyAndVisible()

        return true

    }
}

Swift 3.x

//
//  AppDelegate.swift
//  UIKit056
//
//  Created by Misato Morino on 2016/08/15.
//  Copyright © 2016年 Misato Morino. All rights reserved.
//

import UIKit

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?
    var myViewController: UIViewController?

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {

        //ViewControllerのインスタンス化
        myViewController = ViewController()

        //UINavigationControllerのインスタンス化とrootViewControllerの指定
        let myNavigationController = UINavigationController(rootViewController: myViewController!)

        //UIWindowのインスタンス化
        self.window = UIWindow(frame: UIScreen.main.bounds)

        //UIWindowのrootViewControllerにnavigationControllerを指定
        self.window?.rootViewController = myNavigationController

        //UIWindowの表示
        self.window?.makeKeyAndVisible()

        return true
    }
}

Swift 2.3

//
//  AppDelegate.swift
//  UIKit056
//
//  Created by Misato Morino on 2016/08/15.
//  Copyright © 2016年 Misato Morino. All rights reserved.
//

import UIKit

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?
    var myViewController: UIViewController?

    func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {

        //ViewControllerのインスタンス化
        myViewController = ViewController()

        //UINavigationControllerのインスタンス化とrootViewControllerの指定
        let myNavigationController = UINavigationController(rootViewController: myViewController!)

        //UIWindowのインスタンス化
        self.window = UIWindow(frame: UIScreen.mainScreen().bounds)

        //UIWindowのrootViewControllerにnavigationControllerを指定
        self.window?.rootViewController = myNavigationController

        //UIWindowの表示
        self.window?.makeKeyAndVisible()

        return true
    } 
}

ViewController.swift

Swift 4.x

//
//  ViewController.swift
//  UIKit056
//
//  Created by Misato Morino on 2016/08/15.
//  Copyright © 2016年 Misato Morino. All rights reserved.
//

import UIKit

class ViewController: UIViewController, UINavigationControllerDelegate, UIImagePickerControllerDelegate {

    var myImagePicker: UIImagePickerController!
    var myImageView: UIImageView!

    override func viewDidLoad() {
        super.viewDidLoad()

        self.title = "Select a Image"

        myImageView = UIImageView(frame: self.view.bounds)

        // インスタンス生成
        myImagePicker = UIImagePickerController()

        // デリゲート設定
        myImagePicker.delegate = self

        // 画像の取得先はフォトライブラリ
        myImagePicker.sourceType = UIImagePickerController.SourceType.photoLibrary

        // 画像取得後の編集を不可に
        myImagePicker.allowsEditing = false
    }

    override func viewDidAppear(_ animated: Bool) {
        self.present(myImagePicker, animated: true, completion: nil)

    }

    /**
     画像が選択された時に呼ばれる.
     */
    func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {

        //選択された画像を取得.
        let myImage: AnyObject?  = info[UIImagePickerController.InfoKey.originalImage] as AnyObject

        //選択された画像を表示するViewControllerを生成.
        let secondViewController = SecondViewController()

        //選択された画像を表示するViewContorllerにセットする.
        secondViewController.mySelectedImage = myImage as? UIImage

        myImagePicker.pushViewController(secondViewController, animated: true)

    }

    /**
     画像選択がキャンセルされた時に呼ばれる.
     */
    func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {

        // モーダルビューを閉じる
        self.dismiss(animated: true, completion: nil)
    }

}

Swift 3.x

//
//  ViewController.swift
//  UIKit056
//
//  Created by Misato Morino on 2016/08/15.
//  Copyright © 2016年 Misato Morino. All rights reserved.
//

import UIKit

class ViewController: UIViewController, UINavigationControllerDelegate, UIImagePickerControllerDelegate {

    var myImagePicker: UIImagePickerController!
    var myImageView: UIImageView!

    override func viewDidLoad() {
        super.viewDidLoad()

        self.title = "Select a Image"

        myImageView = UIImageView(frame: self.view.bounds)

        // インスタンス生成
        myImagePicker = UIImagePickerController()

        // デリゲート設定
        myImagePicker.delegate = self

        // 画像の取得先はフォトライブラリ
        myImagePicker.sourceType = UIImagePickerControllerSourceType.photoLibrary

        // 画像取得後の編集を不可に
        myImagePicker.allowsEditing = false
    }

    override func viewDidAppear(_ animated: Bool) {
        self.present(myImagePicker, animated: true, completion: nil)

    }

    /**
     画像が選択された時に呼ばれる.
     */
    func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]) {

        //選択された画像を取得.
        let myImage: AnyObject?  = info[UIImagePickerControllerOriginalImage]

        //選択された画像を表示するViewControllerを生成.
        let secondViewController = SecondViewController()

        //選択された画像を表示するViewContorllerにセットする.
        secondViewController.mySelectedImage = myImage as! UIImage

        myImagePicker.pushViewController(secondViewController, animated: true)

    }

    /**
     画像選択がキャンセルされた時に呼ばれる.
     */
    func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {

        // モーダルビューを閉じる
        self.dismiss(animated: true, completion: nil)
    }

}

Swift 2.3

//
//  ViewController.swift
//  UIKit056
//
//  Created by Misato Morino on 2016/08/15.
//  Copyright © 2016年 Misato Morino. All rights reserved.
//

import UIKit

class ViewController: UIViewController, UINavigationControllerDelegate, UIImagePickerControllerDelegate {

    var myImagePicker: UIImagePickerController!
    var myImageView: UIImageView!

    override func viewDidLoad() {
        super.viewDidLoad()

        self.title = "Select a Image"

        myImageView = UIImageView(frame: self.view.bounds)

        // インスタンス生成
        myImagePicker = UIImagePickerController()

        // デリゲート設定
        myImagePicker.delegate = self

        // 画像の取得先はフォトライブラリ
        myImagePicker.sourceType = UIImagePickerControllerSourceType.PhotoLibrary

        // 画像取得後の編集を不可に
        myImagePicker.allowsEditing = false
    }

    override func viewDidAppear(animated: Bool) {
        self.presentViewController(myImagePicker, animated: true, completion: nil)

    }

    /**
     画像が選択された時に呼ばれる.
     */
    func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]) {

        //選択された画像を取得.
        let myImage: AnyObject?  = info[UIImagePickerControllerOriginalImage]

        //選択された画像を表示するViewControllerを生成.
        let secondViewController = SecondViewController()

        //選択された画像を表示するViewContorllerにセットする.
        secondViewController.mySelectedImage = myImage as! UIImage

        myImagePicker.pushViewController(secondViewController, animated: true)

    }

    /**
     画像選択がキャンセルされた時に呼ばれる.
     */
    func imagePickerControllerDidCancel(picker: UIImagePickerController) {

        // モーダルビューを閉じる
        self.dismissViewControllerAnimated(true, completion: nil)
    }

}

SecondViewController

Swift 4.x

//
//  SecondViewController.swift
//  UIKit056
//
//  Created by Misato Morino on 2016/08/22.
//  Copyright © 2016年 Misato Morino. All rights reserved.
//

import Foundation
import UIKit

class SecondViewController: UIViewController {

    var mySelectedImage: UIImage!
    var mySelectedImageView: UIImageView!

    override func viewDidLoad() {

        self.edgesForExtendedLayout = []
        self.view.backgroundColor = UIColor.white

        setImage()
    }

    /**
     選択された画像をUIImageViewにセットする.
     */
    func setImage(){
        self.title = "Selected Image"

        mySelectedImageView = UIImageView(frame: self.view.bounds)
        mySelectedImageView.contentMode = UIView.ContentMode.scaleAspectFit
        mySelectedImageView.image = mySelectedImage
        self.view.addSubview(mySelectedImageView)
    }

}

Swift 3.x

//
//  SecondViewController.swift
//  UIKit056
//
//  Created by Misato Morino on 2016/08/22.
//  Copyright © 2016年 Misato Morino. All rights reserved.
//

import Foundation
import UIKit

class SecondViewController: UIViewController {

    var mySelectedImage: UIImage!
    var mySelectedImageView: UIImageView!

    override func viewDidLoad() {

        self.edgesForExtendedLayout = []
        self.view.backgroundColor = UIColor.white

        setImage()
    }

    /**
     選択された画像をUIImageViewにセットする.
     */
    func setImage(){
        self.title = "Selected Image"

        mySelectedImageView = UIImageView(frame: self.view.bounds)
        mySelectedImageView.contentMode = UIViewContentMode.scaleAspectFit
        mySelectedImageView.image = mySelectedImage
        self.view.addSubview(mySelectedImageView)
    }

}

Swift 2.3

//
//  SecondViewController.swift
//  UIKit056
//
//  Created by Misato Morino on 2016/08/22.
//  Copyright © 2016年 Misato Morino. All rights reserved.
//

import Foundation
import UIKit

class SecondViewController: UIViewController {

    var mySelectedImage: UIImage!
    var mySelectedImageView: UIImageView!

    override func viewDidLoad() {

        self.edgesForExtendedLayout = UIRectEdge.None
        self.view.backgroundColor = UIColor.whiteColor()

        setImage()
    }

    /**
     選択された画像をUIImageViewにセットする.
     */
    func setImage(){
        self.title = "Selected Image"

        mySelectedImageView = UIImageView(frame: self.view.bounds)
        mySelectedImageView.contentMode = UIViewContentMode.ScaleAspectFit
        mySelectedImageView.image = mySelectedImage
        self.view.addSubview(mySelectedImageView)
    }

}

Info,plist

<key>NSPhotoLibraryUsageDescription</key>
<string>YES</string>
<key>NSAppleMusicUsageDescription</key>
<string>YES</string>

Info.plistに上記を追加（2.3には必要ない）

3.xと4.xの差分

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool が、 func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey : Any]? = nil) -> Bool に変更
UIImagePickerControllerSourceType が UIImagePickerController.SourceType に変更
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]) が func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) に変更
info[UIImagePickerControllerOriginalImage] が info[UIImagePickerController.InfoKey.originalImage] as AnyObject に変更
myImage as! UIImage が myImage as? UIImage に変更
UIViewContentMode が` ``UIView.ContentMode``` に変更

2.3と3.0の差分

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]) から func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]) に変更
func imagePickerControllerDidCancel(picker: UIImagePickerController) から func imagePickerControllerDidCancel(_ picker: UIImagePickerController) に変更
presentViewController から present に変更
dismissViewControllerAnimated から dismiss に変更

Reference

UIImagePickerController
- https://developer.apple.com/reference/uikit/uiimagepickercontroller