- (IBAction)biologyAction:(id)sender {
  
  LAContext *context = [[LAContext alloc] init];
  NSError *error = nil;
  NSString *reason = @"我們需要驗(yàn)證您的指紋來確認(rèn)您的身份";
  
  // 判斷設(shè)置是否支持指紋識(shí)別(iPhone5s+、iOS8+支持)
  if([context canEvaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics error:&error]){
    
    // 指紋識(shí)別只判斷當(dāng)前用戶是否是機(jī)主
    [context evaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics localizedReason:reason reply:^(BOOL success, NSError * _Nullable error) {
      if(success){
        NSLog(@"指紋認(rèn)證成功");
      }
      else{
        NSLog(@"指紋認(rèn)證失敗");
        NSLog(@"錯(cuò)誤碼：%zd",error.code);
        NSLog(@"出錯(cuò)信息：%@",error);
        // 錯(cuò)誤碼 error.code
        // -1: 連續(xù)三次指紋識(shí)別錯(cuò)誤
        // -2: 在TouchID對(duì)話框中點(diǎn)擊了取消按鈕
        // -3: 在TouchID對(duì)話框中點(diǎn)擊了輸入密碼按鈕
        // -4: TouchID對(duì)話框被系統(tǒng)取消，例如按下Home或者電源鍵
        // -8: 連續(xù)五次指紋識(shí)別錯(cuò)誤，TouchID功能被鎖定，下一次需要輸入系統(tǒng)密碼
      }
    }];
  }
  else{
    NSLog(@"TouchID設(shè)備不可用");
    NSLog(@"錯(cuò)誤碼：%zd",error.code);
    NSLog(@"出錯(cuò)信息：%@",error);
  }
}

import UIKit
import LocalAuthentication

class ViewController: UIViewController {
  
  override func viewDidLoad() {
    super.viewDidLoad()
  }
  
  @IBAction func yanzhengAction(_ sender: AnyObject) {
    
    let context = LAContext()
    let reason = "我們需要您的指紋來驗(yàn)證您的身份"
    var error:NSError?
    
    if context.canEvaluatePolicy(LAPolicy.deviceOwnerAuthenticationWithBiometrics, error:&error){
      context.evaluatePolicy(LAPolicy.deviceOwnerAuthenticationWithBiometrics, localizedReason: reason, reply: { (isSuc, error) in
        if isSuc{
          print("指紋驗(yàn)證成功")
        }
        else{
          print("指紋驗(yàn)證失敗")
          print("錯(cuò)誤信息：\(error)")
          // 錯(cuò)誤碼 error.code
          // -1: 連續(xù)三次指紋識(shí)別錯(cuò)誤
          // -2: 在TouchID對(duì)話框中點(diǎn)擊了取消按鈕
          // -3: 在TouchID對(duì)話框中點(diǎn)擊了輸入密碼按鈕
          // -4: TouchID對(duì)話框被系統(tǒng)取消，例如按下Home或者電源鍵
          // -8: 連續(xù)五次指紋識(shí)別錯(cuò)誤，TouchID功能被鎖定，下一次需要輸入系統(tǒng)密碼
        }
      })
    }
    else{
      print("TouchID設(shè)置不支持")
      print("錯(cuò)誤碼：\(error!.code)")
      print("錯(cuò)誤信息：\(error)")
    }
  }
}