如何在iOS 10中使用TouchID

Question

我想在我的iOS应用程序中实现本地身份验证安全性但是我收到错误而无法弄清楚我为什么会这样做.

我正在使用iPhone 5s.这有关系吗？

码:

import UIKit
import LocalAuthentication

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    @IBAction func action(_ sender: Any) {
        authenticateUser()
    }

    func authenticateUser() {
        let authContext : LAContext = LAContext()
        var error: NSError?

        if authContext.canEvaluatePolicy(LAPolicy.deviceOwnerAuthenticationWithBiometrics, error: &error){
            authContext.evaluatePolicy(LAPolicy.deviceOwnerAuthenticationWithBiometrics, localizedReason: "Biometric Check for application", reply: {(successful: Bool, error: NSError?) -> Void in
                if successful{
                    print("TouchID Yes")
                }
                else{
                    print("TouchID No")
                }
                } as! (Bool, Error?) -> Void)
        }
        else{
            authContext.evaluatePolicy(LAPolicy.deviceOwnerAuthentication, localizedReason: "Enter your Passcode", reply: {
                (successful: Bool, error: NSError?) in
                if successful{
                    print("PassCode Yes")
                }
                else{
                    print("PassCode No")
                }
                } as! (Bool, Error?) -> Void)
        }
    }
}

错误:

提前致谢.

Answer 1

没有类型转换的代码应该工作

func authenticateUser() {
    let authContext : LAContext = LAContext()
    var error: NSError?

    if authContext.canEvaluatePolicy(LAPolicy.deviceOwnerAuthenticationWithBiometrics, error: &error){
        authContext.evaluatePolicy(LAPolicy.deviceOwnerAuthenticationWithBiometrics, localizedReason: "Biometric Check for application", reply: {successful, error -> Void in
            if successful{
                print("TouchID Yes")
            }
            else{
                print("TouchID No")
            }
        }
        )
    }
    else{
        authContext.evaluatePolicy(LAPolicy.deviceOwnerAuthentication, localizedReason: "Enter your Passcode", reply: {
            successful,error in
            if successful{
                print("PassCode Yes")
            }
            else{
                print("PassCode No")
            }
        }
        )
    }
}