Touch IDとFace IDコード
生体認証について質問したい。私のアプリでは、Touch IDを使用して認証を入力しました。 voelvoはFace IDでメソッドを実装します。
Privacy-Face ID Usage Descriptionという行を.plistファイルに挿入しました
さて、TouchIDコードに変更を加えなくてもFace IDが正しく機能することに気づきました。
私の質問は：
** Touch ID実装コードはFace IDと同じですか？ Touch ID実装コードを変更せずにそのままにしておくことはできますか、それともFace IDのコードを数行追加する必要がありますか？**
Touch IDの実装方法を示します
#pragma mark - TOUCH ID Login
-(void)useTouchID {
NSError *error;
LAContext *context = [[LAContext alloc] init];
NSString *emailAccount = [KFKeychain loadObjectForKey:USER_EMAIL];
NSString *reasonString = [NSString stringWithFormat:@"Autentica %@ utilizzando la tua impronta", emailAccount];
if ([context canEvaluatePolicy:kLAPolicyDeviceOwnerAuthenticationWithBiometrics error:&error]) {
[context evaluatePolicy:kLAPolicyDeviceOwnerAuthenticationWithBiometrics localizedReason: reasonString reply:^(BOOL success, NSError * _Nullable error) {
// Se la procedura con il TouchID va a buon fine settiamo il booleano su YES che specifica se l'utente a scelto di utilizzare il TouchID oppure NO.
// Successivamente invochiamo il metodo loginWithFirebase per procedere con l'autenticazione su firebase
dispatch_async(dispatch_get_main_queue(), ^{
[APPDELEGATE showHud];
});
if (success) {
_useBiometricsAuthentication = YES;
// Attualmente il TouchID non viene supportato da Firebase pertanto dobbiamo autenticarci con l'impronta digitale e successivamente eseguire il login con Firebase.
[self useFirebaseSignIn];
}
// Nel caso in cui si verifichino alcuni errori con l'uso del TouchID andiamo ad implementare ogni singolo errore che l'utente puo' riscontrare
else {
_useBiometricsAuthentication = NO;
switch ([error code]) {
// L'autenticazione con Touch ID è fallità
case kLAErrorAuthenticationFailed:
NSLog(@"Autenticazione Fallita");
dispatch_async(dispatch_get_main_queue(), ^{
[APPDELEGATE removeHud];
});
break;
// L'user ha spinto annulla sull'alert che compare sulla richiesta di TouchID oppure ha spinto il pulsante Home facendo scomparire l'alert
case kLAErrorUserCancel:
NSLog(@"User ha respinto il touch ID");
dispatch_async(dispatch_get_main_queue(), ^{
[APPDELEGATE removeHud];
});
break;
// In questo caso l'user ha piu volte tentato di utilizzare il touchID e ha preferito inserire le proprie credenziali manualmente
case kLAErrorUserFallback:
NSLog(@"L'user ha scelto di utilizzare il login di firebase");
// a questo punto eliminiamo tutti i dati salvati con il login precedente in modo tale da poter salvare nuovamente le credenziali che l'utente ha inserito manualmente
[self deleteUserKey];
dispatch_async(dispatch_get_main_queue(), ^{
[APPDELEGATE removeHud];
});
break;
// L'errore ci comunica che l'utente molto probabilmente non ha mai inserito / salvato le proprie impronte digitali nel suo dispositivo
case kLAErrorTouchIDNotEnrolled:
NSLog(@" non sono state impostate impronte per utilizzare il touch id");
dispatch_async(dispatch_get_main_queue(), ^{
[APPDELEGATE showAlertWithTitle:@"ATTENZIONE" message:@"Il TUOCH ID ha bisogno di avere delle impronte digitali impostate per poter funzionare. Vai sulle IMPOSTAZIONI del tuo dispositivo in TOUCH ID e CODICE per inserirle" optionTitle:@"OK" otherOptionTitle:nil optionButtonAction:^{
[APPDELEGATE dismissAlert];
} canButtonAction:nil];
[APPDELEGATE removeHud];
});
break;
// In questo caso ci avverte che per utilizzare il TouchID l'app deve aver salvato almeno una volte le credenziali che l'utente inserisce manualmente, all'interno di un portachiavi come ad esempio la libreria utilizzata in questa app (Keychain)
case kLAErrorPasscodeNotSet: {
NSLog(@"il touch id ha bisogno di avere dei codici di accesso salvati per essere usato");
dispatch_async(dispatch_get_main_queue(), ^{
[APPDELEGATE showAlertWithTitle:@"ATTENZIONE" message:@"Sembra che non vi sia nessun account collegato a queste impronte. Perfavore effettua il login classico utilizzando la tua Email e la tua Password del tuo account Unistit e riprova." optionTitle:@"OK" otherOptionTitle:nil optionButtonAction:^{
[APPDELEGATE dismissAlert];
[self.emailField becomeFirstResponder];
[self deleteUserKey];
} canButtonAction:nil];
[APPDELEGATE removeHud];
});
break;
}
default:
break;
}
}
}];
}
}
アプリがすでにTouch IDをサポートしている場合は、コードをFace ID対応にするために更新する必要はありません。（表示 ここ ） 
iOSは内部ですべての作業を処理します。
ただし、アプリがFace ID対応デバイスで実行されている場合は、「タッチID」を含む文字列を「Face ID」に変更することができます。
編集：MikeMertsock によって注記されているように、 LAContext クラスにはbiometryTypeプロパティがありますデバイスがTouch IDまたはFace IDのどちらを使用するかを決定します。
これを探している可能性があります：biometryTypeは、ユーザー情報のみの一部のローカライズ可能変数を指定/更新するために使用されます。作業コードは、biometryTypeを自動的に識別し、認証操作を処理します。更新する必要はありません。
これはサンプルコードです。手動で検出できる方法、デバイスでサポートされている生体認証タイプは次のとおりです。
LAContext *laContext = [[LAContext alloc] init];
NSError *error;
if ([laContext canEvaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics error:&error]) {
if (error != NULL) {
// handle error
} else {
if (@available(iOS 11.0.1, *)) {
if (laContext.biometryType == LABiometryTypeFaceID) {
//localizedReason = "Unlock using Face ID"
NSLog(@"FaceId support");
} else if (laContext.biometryType == LABiometryTypeTouchID) {
//localizedReason = "Unlock using Touch ID"
NSLog(@"TouchId support");
} else {
//localizedReason = "Unlock using Application Passcode"
NSLog(@"No Biometric support");
}
} else {
// Fallback on earlier versions
}
[laContext evaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics localizedReason:@"Test Reason" reply:^(BOOL success, NSError * _Nullable error) {
if (error != NULL) {
// handle error
} else if (success) {
// handle success response
} else {
// handle false response
}
}];
}
}
func authenticateUser() {
// Get the local authentication context.
let context = LAContext()
// Declare a NSError variable.
// Set the reason string that will appear on the authentication alert.
_ = "Authentication is needed to access your notes."
var policy: LAPolicy?
// Depending the iOS version we'll need to choose the policy we are able to use
if #available(iOS 9.0, *) {
// iOS 9+ users with Biometric and Passcode verification
policy = .deviceOwnerAuthentication
} else {
// iOS 8+ users with Biometric and Custom (Fallback button) verification
context.localizedFallbackTitle = "Fuu!"
policy = .deviceOwnerAuthenticationWithBiometrics
}
context.evaluatePolicy(policy!, localizedReason: "Please Add your touch Id", reply: { (success, error) in
DispatchQueue.main.async {
RKDropdownAlert.title(NSLocalizedString("Success", comment: ""), message: NSLocalizedString("User Touch Id Enrolled Successfully", comment: ""), backgroundColor: BMConstants.KAppBGColor, textColor: BMConstants.KAppWhiteColor)
guard success else {
guard let error = error else {
return
}
switch(error) {
case LAError.authenticationFailed:
//self.message.text = "There was a problem verifying your identity."
break
case LAError.userCancel:
RKDropdownAlert.title(NSLocalizedString("Error", comment: ""), message: NSLocalizedString("User cancelled", comment: ""), backgroundColor: BMConstants.KAppBGColor, textColor: BMConstants.KAppWhiteColor)
// self.message.text = "Authentication was canceled by user."
// Fallback button was pressed and an extra login step should be implemented for iOS 8 users.
// By the other hand, iOS 9+ users will use the pasccode verification implemented by the own system.
break
case LAError.userFallback:
RKDropdownAlert.title(NSLocalizedString("Error", comment: ""), message: NSLocalizedString("The user tapped the fallback", comment: ""), backgroundColor: BMConstants.KAppBGColor, textColor: BMConstants.KAppWhiteColor)
//self.message.text = "The user tapped the fallback button (Fuu!)"
break
case LAError.systemCancel:
RKDropdownAlert.title(NSLocalizedString("Error", comment: ""), message: NSLocalizedString("Authentication was canceled by system", comment: ""), backgroundColor: BMConstants.KAppBGColor, textColor: BMConstants.KAppWhiteColor)
// self.message.text = "Authentication was canceled by system."
break
case LAError.passcodeNotSet:
RKDropdownAlert.title(NSLocalizedString("Error", comment: ""), message: NSLocalizedString("Passcode is not set on the device", comment: ""), backgroundColor: BMConstants.KAppBGColor, textColor: BMConstants.KAppWhiteColor)
// self.message.text = "Passcode is not set on the device."
break
case LAError.touchIDNotAvailable:
RKDropdownAlert.title(NSLocalizedString("Error", comment: ""), message: NSLocalizedString("Touch ID is not available on the device", comment: ""), backgroundColor: BMConstants.KAppBGColor, textColor: BMConstants.KAppWhiteColor)
// self.message.text = "Touch ID is not available on the device."
break
case LAError.touchIDNotEnrolled:
RKDropdownAlert.title(NSLocalizedString("Error", comment: ""), message: NSLocalizedString("TTouch ID has no enrolled fingers", comment: ""), backgroundColor: BMConstants.KAppBGColor, textColor: BMConstants.KAppWhiteColor)
// self.message.text = "Touch ID has no enrolled fingers."
break
// iOS 9+ functions
case LAError.touchIDLockout:
RKDropdownAlert.title(NSLocalizedString("Error", comment: ""), message: NSLocalizedString("here were too many failed Touch ID attempts and Touch ID is now locked", comment: ""), backgroundColor: BMConstants.KAppBGColor, textColor: BMConstants.KAppWhiteColor)
break
case LAError.appCancel:
RKDropdownAlert.title(NSLocalizedString("Error", comment: ""), message: NSLocalizedString("Authentication was canceled by application", comment: ""), backgroundColor: BMConstants.KAppBGColor, textColor: BMConstants.KAppWhiteColor)
// self.message.text = "Authentication was canceled by application."
break
case LAError.invalidContext:
RKDropdownAlert.title(NSLocalizedString("Error", comment: ""), message: NSLocalizedString("LAContext passed to this call has been previously invalidated.", comment: ""), backgroundColor: BMConstants.KAppBGColor, textColor: BMConstants.KAppWhiteColor)
// self.message.text = "LAContext passed to this call has been previously invalidated."
break
default:
RKDropdownAlert.title(NSLocalizedString("Error", comment: ""), message: NSLocalizedString("Touch ID may not be configured", comment: ""), backgroundColor: BMConstants.KAppBGColor, textColor: BMConstants.KAppWhiteColor)
// self.message.text = "Touch ID may not be configured"
break
}
return
}
}
}
)
}