13

我想使用 TouchID 验证我的应用程序，验证成功。如果 TouchID 不匹配，则会打开“重试”警报，并且在该警报中是“输入密码”选项。如果用户选择了，系统密码验证应该显示，但我该怎么做呢？

在这里分享我的代码：

func touchIDAuthentication() {
    let context = LAContext() //1
    var error:NSError?
    guard context.canEvaluatePolicy(.deviceOwnerAuthenticationWithBiometrics, error: &error) else {
        showAlertViewIfNoBiometricSensorHasBeenDetected()
        return
    }
    if context.canEvaluatePolicy(.deviceOwnerAuthenticationWithBiometrics, error: &errorPointer) {
        context.evaluatePolicy(.deviceOwnerAuthenticationWithBiometrics, localizedReason: reason, reply: { (success, error) in
            if success {
                DispatchQueue.main.async {
                    print("Authentication was successful")
                }
            }else {
                DispatchQueue.main.async {
                    self.displayErrorMessage(error: error as! LAError )
                    print("Authentication was error")
                }
            }
        })
    }else {
        self.showAlertWith(title: "Error", message: (errorPointer?.localizedDescription)!)
    }
}



func displayErrorMessage(error:LAError) {
        var message = ""
        switch error.code {
        case LAError.authenticationFailed:
            message = "Authentication Failed."
            break
        case LAError.userCancel:
            message = "User Cancelled."
            break
        case LAError.userFallback:
            message = "Fallback authentication mechanism selected."
            break
        case LAError.touchIDNotEnrolled:
            message = "Touch ID is not enrolled."

        case LAError.passcodeNotSet:
            message = "Passcode is not set on the device."
            break
        case LAError.systemCancel:
            message = "System Cancelled."
            break
        default:
            message = error.localizedDescription
        }
        self.showAlertWith(title: "Authentication Failed", message: message)
    }

如果输入移动到我的应用程序的密码，如何显示此屏幕。如何实现这一点对我有帮助。提前谢谢。

4

2 回答 2

22

如果您使用策略.deviceOwnerAuthentication ，则会立即显示“输入密码”选项。

如果您.deviceOwnerAuthenticationWithBiometrics按原样使用 ，则“输入密码”选项仅在第一次不成功的生物特征认证尝试后显示。

无论用户如何进行身份验证，都会调用您的完成闭包。

于 2017-11-09T12:03:48.550 回答
21

将LAPolicy策略枚举值deviceOwnerAuthenticationWithBiometrics替换为deviceOwnerAuthentication

注意：如果用户启用biometric（面部识别或触摸识别）身份验证，则设备将首先要求进行生物识别身份验证，如果用户选择回退身份验证，则只会 deviceOwnerAuthentication显示密码屏幕。

试试这个，看看：

func touchIDAuthentication() {
    let context = LAContext()
    var error:NSError?

    // edit line - deviceOwnerAuthentication
    guard context.canEvaluatePolicy(.deviceOwnerAuthentication, error: &error) else {
        //showAlertViewIfNoBiometricSensorHasBeenDetected()
        return
    }

    // edit line - deviceOwnerAuthentication
    if context.canEvaluatePolicy(.deviceOwnerAuthentication, error: &errorPointer) {

        // edit line - deviceOwnerAuthentication
        context.evaluatePolicy(.deviceOwnerAuthentication, localizedReason: reason, reply: { (success, error) in
            if success {
                DispatchQueue.main.async {
                    print("Authentication was successful")
                }
            }else {
                DispatchQueue.main.async {
                    //self.displayErrorMessage(error: error as! LAError )
                    print("Authentication was error")
                }
            }
        })
    }else {
       // self.showAlertWith(title: "Error", message: (errorPointer?.localizedDescription)!)
    }
}
于 2017-11-09T12:04:05.257 回答