Swift 在应用程序通过面部id和触摸id身份验证后，实例化EviewController问题

我在页面中添加了一个“触摸id或面部id”按钮。我已为此按钮创建了一个操作：

btnTouchIdOrFaceIdIsPressed

。问题1：单击

触摸id或面部

id按钮后，它不会打开应用程序屏幕中的

HomePageViewController

。为什么?

@IBAction func btnTouchIdOrFaceIdIsPressed(_ sender: UIButton) {
    self.useBiometricAuthentication()
}

func useBiometricAuthentication () {
    let context = LAContext()
    var error : NSError?
    let reason = "some message for app user for the touch id or face id.."
    if context.canEvaluatePolicy(.deviceOwnerAuthenticationWithBiometrics, error: &error) {
        context.evaluatePolicy(.deviceOwnerAuthenticationWithBiometrics, localizedReason: reason) { (success, error) in
            if success {
                self.callMeAfterSuccessLoginAction()
            } else {
                //Question2: Can you write an explanation for this scope? Touch id or face is authentication is failed, right?
            }
        }
    } else {
        //Question3: Can you write an explanation for this scope? "device does not support face id or touch id", right?
    }
}

func callMeAfterSuccessLoginAction() {
    DispatchQueue.main.async {
        let oHomepageViewController = self.storyboard?.instantiateViewController(withIdentifier: "Homepage") as! HomepageViewController
        self.navigationController?.setViewControllers([oHomepageViewController], animated: true)
    }
}

你能同时回答问题2和问题3吗

问题1：它不会在应用程序中打开HomePageViewController 点击触摸id或面部id按钮后的屏幕。为什么?

@IBAction func btnTouchIdOrFaceIdIsPressed(_ sender: UIButton) {
    self.useBiometricAuthentication()
}

func useBiometricAuthentication () {
    let context = LAContext()
    var error : NSError?
    let reason = "some message for app user for the touch id or face id.."
    if context.canEvaluatePolicy(.deviceOwnerAuthenticationWithBiometrics, error: &error) {
        context.evaluatePolicy(.deviceOwnerAuthenticationWithBiometrics, localizedReason: reason) { (success, error) in
            if success {
                self.callMeAfterSuccessLoginAction()
            } else {
                //Question2: Can you write an explanation for this scope? Touch id or face is authentication is failed, right?
            }
        }
    } else {
        //Question3: Can you write an explanation for this scope? "device does not support face id or touch id", right?
    }
}

func callMeAfterSuccessLoginAction() {
    DispatchQueue.main.async {
        let oHomepageViewController = self.storyboard?.instantiateViewController(withIdentifier: "Homepage") as! HomepageViewController
        self.navigationController?.setViewControllers([oHomepageViewController], animated: true)
    }
}

您可以检查navigationController是否为非零

print(navigationController ?? "NavigationController is nil")

问题2：你能为这个范围写一个解释吗？触摸id或人脸身份验证失败，对吗

触摸ID或面部ID身份验证失败

问题3：你能为这个范围写一个解释吗？“设备不支持面部id或触摸id”，对吗

---

Touch ID或FaceID身份验证不可用，可能是用户未设置它

请检查它是否进入

成功

状态，即调用

呼叫成功后登录操作

。如果是这样，请检查您的

导航控制器
是否为空，然后在成功登录操作后将打印输入CallMea。我看到印刷品了。但我已经用另一种方法解决了。我创建了一个函数。我在这个函数中写了performsgue。然后我在CallMeafterSuccessLoginAction中的DispatchQueue.main.async中调用了这个函数。成功了。我看到主页视图控制器。谢谢你的回复。如果可能的话，你能解释一下范围2和范围3吗？（问题2和问题3）或者你能说我的评论是正确的吗？还是失踪@Arnabore和亲爱的@Arnabore您能写下如何检查navigationController是否为零吗。你能分享这些代码吗？这可能是因为你当前的ViewController可能是以模式显示的。在这种情况下，关闭ViewController，然后从导航控制器中推送。或者移动到根导航控制器，然后推到HomeViewController。另一种方法是显示HomeController，但我想这不是您想要的