質問編集履歴
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```
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[参考](https://watchcontents.com/swift-appdelegate-method/)
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[参考ページ](https://watchcontents.com/swift-appdelegate-method/)
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}
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}
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```
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```
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[参考](https://watchcontents.com/swift-appdelegate-method/)
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1
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appDelegateからHomeViewControllerのメソッド```
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appDelegateからHomeViewControllerのメソッド```hello()```を呼び出そうとしたところ
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こちらのエラーが表示されアプリが落ちてしまいます。
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```
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Thread 1: Fatal error: Unexpectedly found nil while implicitly unwrapping an Optional value
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1
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9
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AppDelegate
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```
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import UIKit
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12
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-
import NCMB
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13
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import AuthenticationServices
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12
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@UIApplicationMain
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class AppDelegate: UIResponder, UIApplicationDelegate {
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@@ -22,49 +20,11 @@
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func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
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// Override point for customization after application launch.
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// APIキー
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let applicationKey = "~~~"
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let clientKey = "~~~"
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-
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29
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// APIキーの設定とSDK初期化
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NCMB.initialize(applicationKey: applicationKey, clientKey: clientKey);
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31
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-
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32
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// on the initial view controller or somewhere else, check the userdefaults
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33
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if let userID = UserDefaults.standard.string(forKey: "userID") {
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// move to main view
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35
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print("以前にログイン済み")
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print(userID)
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37
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-
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38
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-
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39
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-
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23
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let appDelegate = UIApplication.shared.delegate as! AppDelegate
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40
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-
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24
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appDelegate.homeViewController.hello()//ここでエラー表示される落ちる
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41
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-
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42
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-
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43
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-
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25
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+
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44
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-
goLoginViewConroller()
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}
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-
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return true
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48
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-
}
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}
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49
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-
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50
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//ログインコントローラーに遷移
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func goLoginViewConroller(){
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52
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-
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53
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DispatchQueue.main.async {
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54
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//画面遷移させたい部分に以下の処理を記述
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55
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// windowを生成
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56
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-
self.window = UIWindow(frame: UIScreen.main.bounds)
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57
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// Storyboardを指定
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58
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let storyboard = UIStoryboard(name: "Main", bundle: nil)
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59
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// Viewcontrollerを指定
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60
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let loginViewController = storyboard.instantiateViewController(withIdentifier:"login")
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61
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// rootViewControllerに入れる
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62
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self.window?.rootViewController = loginViewController
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63
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// 表示
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64
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self.window?.makeKeyAndVisible()
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65
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}
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66
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}
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67
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-
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68
28
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}
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69
29
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70
30
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@@ -73,7 +33,6 @@
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73
33
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HomeViewController
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74
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```
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75
35
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import UIKit
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76
|
-
import AuthenticationServices
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77
36
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78
37
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79
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class HomeViewController: UIViewController {
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@@ -89,37 +48,9 @@
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89
48
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90
49
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}
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91
50
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51
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+
func hello() {
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92
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-
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52
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+
print("hello")
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93
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-
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94
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NotificationCenter.default.addObserver(self, selector: #selector(handleASCredential), name: ASAuthorizationAppleIDProvider.credentialRevokedNotification, object: nil)
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95
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-
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96
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-
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97
53
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}
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98
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-
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99
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-
//Appleのサインイン状態の確認
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100
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-
@objc func handleASCredential() {
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101
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-
let userID = UserDefaults.standard.string(forKey: "userID")
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|
102
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-
print("userIdは(userID)")
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103
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-
let appleIDProvider = ASAuthorizationAppleIDProvider()
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104
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-
appleIDProvider.getCredentialState(forUserID: userID!) { (credentialState, error) in
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105
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-
switch credentialState {
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106
|
-
case .authorized:
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107
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-
print("user remain logged in, proceed to another view")
|
|
108
|
-
//self.performSegue(withIdentifier: "LoginToUserSegue", sender: nil)
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109
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-
case .revoked:
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110
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-
print("user logged in before but revoked")
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111
|
-
self.appDelegate.goLoginViewConroller()
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112
|
-
case .notFound:
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113
|
-
print("user haven't log in before")
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|
114
|
-
self.appDelegate.goLoginViewConroller()
|
|
115
|
-
default:
|
|
116
|
-
print("unknown state")
|
|
117
|
-
self.appDelegate.goLoginViewConroller()
|
|
118
|
-
}
|
|
119
|
-
}
|
|
120
|
-
}
|
|
121
|
-
|
|
122
|
-
|
|
123
54
|
}
|
|
124
55
|
|
|
125
56
|
```
|