LAContext *context = [[LAContext alloc] init];  NSError *error = nil;  //驗(yàn)證是否支持指紋識(shí)別  if ([context canEvaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics error:&error]) {    NSLog(@"支持指紋識(shí)別的應(yīng)用");    //驗(yàn)證身份    [context evaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics localizedReason:NSLocalizedString(@"需要指紋來(lái)驗(yàn)證你的身份", @"hello") reply:^(BOOL success, NSError *error) {      if (success) {        NSLog(@"成功");      } else {        switch (error.code) {          case LAErrorUserCancel:            NSLog(@"用戶取消了授權(quán) - %@", error.localizedDescription);            break;          case LAErrorUserFallback:            NSLog(@"用戶點(diǎn)擊了“輸入密碼”按鈕 - %@", error.localizedDescription);            break;          case LAErrorAuthenticationFailed:            NSLog(@"您已授權(quán)失敗3次 - %@", error.localizedDescription);            break;          case LAErrorTouchIDLockout:            NSLog(@"指紋被鎖定 - %@", error.localizedDescription);            break;          case LAErrorSystemCancel:            NSLog(@"應(yīng)用程序進(jìn)入后臺(tái) - %@", error.localizedDescription);            break;          default:            NSLog(@"++%@--%zd", error.localizedDescription, error.code);            break;        }      }    }];  } else {    switch (error.code) {      case LAErrorPasscodeNotSet:        NSLog(@"未設(shè)置密碼 - %@", error.localizedDescription);        break;      case LAErrorTouchIDNotEnrolled:        NSLog(@"未注冊(cè) Touch ID - %@", error.localizedDescription);        break;      case kLAErrorTouchIDNotAvailable:        NSLog(@"該設(shè)備不支持 Touch ID - %@", error.localizedDescription);        break;      default:        NSLog(@"--%@--%zd", error.localizedDescription, error.code);        break;    }  }