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iOS13、Xcode11 私はこうしてつまずいたAdvent Calendar 2019

Day 15

iOS13のMFMailComposeViewControllerにつまずいた

Last updated at Posted at 2019-12-14

はじめに

もうネタがない...と思いつつ iOS13 の MFMailComposeViewController につまずいたという噂を聞いたので色々動かしたみました。

動かしてみたところナビゲーションバーのカスタマイズがうまくいかない:confused:

検証

AppDelegate で下記のように全体のナビゲーションバーをカスタムしてみる。

検証1

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
  // Override point for customization after application launch.
  UINavigationBar.appearance().tintColor = .white
  UINavigationBar.appearance().barTintColor = .red
  UINavigationBar.appearance().titleTextAttributes = [.foregroundColor : UIColor.white]
  UINavigationBar.appearance().largeTitleTextAttributes = [.foregroundColor : UIColor.white]
  return true
}

MFMailComposeViewController の表示は下記。

if MFMailComposeViewController.canSendMail() {
  let mailVC = MFMailComposeViewController()
  mailVC.mailComposeDelegate = self
  mailVC.setToRecipients(["piyo@example.com "])
  mailVC.setSubject("Singleton")
  mailVC.setMessageBody("しんぐるしんぐるとんとんとん", isHTML: false)
  present(mailVC, animated: true)
} else {
  print("Mail services are not available")
}

結果1

結果は下記のような表示。(実機が iPod touch と iPad しかないので大きさがちょっと...:see_no_evil:)

iOS12 iOS13
12_1 13_1

うーん両方思った結果とは違う...:neutral_face:

検証2

AppDelegate はそのまま MFMailComposeViewController の表示はをちょっと修正。

if MFMailComposeViewController.canSendMail() {
  let mailVC = MFMailComposeViewController()
  mailVC.navigationBar.tintColor = .white // ここ追加
  mailVC.navigationBar.titleTextAttributes = [.foregroundColor : UIColor.white] // ここ追加
  mailVC.navigationBar.largeTitleTextAttributes = [.foregroundColor : UIColor.white] // ここ追加
  mailVC.mailComposeDelegate = self
  mailVC.setToRecipients(["piyo@example.com "])
  mailVC.setSubject("Singleton")
  mailVC.setMessageBody("しんぐるしんぐるとんとんとん", isHTML: false)
  present(mailVC, animated: true)
} else {
  print("Mail services are not available")
}

結果2

結果は下記のような表示。

iOS12 iOS13
12_2 13_2

うーんボタンは変わったけど両方思った結果とは違う...:neutral_face:

iOS12 でタイトルの色が変わらない件に関しては下記がヒットした。が、解決策は見当たらず:neutral_face:

検証3

iOS12 のタイトルはもうあきらめよう:grimacing:

iOS13 をどうするか...??色々調べてみると iOS13 から UINavigationBarappearance の設定が変わった模様(参考

AppDelegate を下記のように書き換えます。

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
  // Override point for customization after application launch.
  if #available(iOS 13.0, *) {
    let appearance = UINavigationBarAppearance()
    let button = UIBarButtonItemAppearance(style: .plain)
    button.normal.titleTextAttributes = [.foregroundColor: UIColor.white]
    appearance.buttonAppearance = button
    let done = UIBarButtonItemAppearance(style: .done)
    done.normal.titleTextAttributes = [.foregroundColor: UIColor.white]
    appearance.doneButtonAppearance = done
    appearance.backgroundColor = .red
    appearance.titleTextAttributes = [.foregroundColor : UIColor.white]
    appearance.largeTitleTextAttributes = [.foregroundColor : UIColor.white]
    UINavigationBar.appearance().standardAppearance = appearance
    UINavigationBar.appearance().scrollEdgeAppearance = appearance
  } else {
    // Fallback on earlier versions
    UINavigationBar.appearance().tintColor = .white
    UINavigationBar.appearance().barTintColor = .red
    UINavigationBar.appearance().titleTextAttributes = [.foregroundColor : UIColor.white]
    UINavigationBar.appearance().largeTitleTextAttributes = [.foregroundColor : UIColor.white]
  }
  return true
}

MFMailComposeViewController の表示はもちょっと修正。

if MFMailComposeViewController.canSendMail() {
  let mailVC = MFMailComposeViewController()
  if #available(iOS 13.0, *) {
  } else {
    mailVC.navigationBar.tintColor = .white
    mailVC.navigationBar.titleTextAttributes = [.foregroundColor : UIColor.white]
    mailVC.navigationBar.largeTitleTextAttributes = [.foregroundColor : UIColor.white]
  }
  mailVC.mailComposeDelegate = self
  mailVC.setToRecipients(["piyo@example.com "])
  mailVC.setSubject("Singleton")
  mailVC.setMessageBody("しんぐるしんぐるとんとんとん", isHTML: false)
  present(mailVC, animated: true)
} else {
  print("Mail services are not available")
}

結果3

結果は下記のような表示。

iOS12 iOS13
12_2 13_3

はい、だめーーー:neutral_face:

iOS13 が結局変わらない:neutral_face:

結論

MFMailComposeViewController のカスタマイズはあきらめよう!!ナビゲーションバーのカスタマイズはカスタムクラスなりで対応し MFMailComposeViewController に影響が出ないようにしよう:fist:

さいごに

appearanceMFMailComposeViewControllerUIActivityViewController などに思わぬ影響が出ていい思い出がないので個人的には撲滅したいです:expressionless:

(けど UIView.appearance().isExclusiveTouch = true はたまに使ったりします:speak_no_evil:)

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