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，但我是 出现错误，无法弄清楚为什么我得到这个。

我正在使用iPhone 5s。这很重要吗？

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：

在此先感谢。

Answer 1

没有强制类型转换此代码应该工作

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") 
      } 
     } 
     ) 
    } 
}