iOS指纹登录(TouchID)集成方案详解

 //首先判断版本
if (NSFoundationVersionNumber < NSFoundationVersionNumber_iOS_8_0) {
  NSLog(@"系统版本不支持TouchID");
  return;
}

 if ([context canEvaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics error:&error]) {

- (IBAction)loginButtonClick:(UIButton *)sender {
  
 //首先判断版本
 if (NSFoundationVersionNumber < NSFoundationVersionNumber_iOS_8_0) {
  NSLog(@"系统版本不支持TouchID");
  return;
 }
  
  
 LAContext *context = [[LAContext alloc] init];
 context.localizedFallbackTitle = @"输入密码";
 if (@available(iOS 10.0, *)) {
//  context.localizedCancelTitle = @"22222";
 } else {
  // Fallback on earlier versions
 }
 NSError *error = nil;
 
 if ([context canEvaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics error:&error]) {
   
  [context evaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics localizedReason:@"通过Home键验证已有手机指纹" reply:^(BOOL success, NSError * _Nullable error) {
    
   if (success) {
    dispatch_async(dispatch_get_main_queue(), ^{
     NSLog(@"TouchID 验证成功");
    });
   }else if(error){
     
    switch (error.code) {
     case LAErrorAuthenticationFailed:{
      dispatch_async(dispatch_get_main_queue(), ^{
       NSLog(@"TouchID 验证失败");
      });
      break;
     }
     case LAErrorUserCancel:{
      dispatch_async(dispatch_get_main_queue(), ^{
       NSLog(@"TouchID 被用户手动取消");
      });
     }
      break;
     case LAErrorUserFallback:{
      dispatch_async(dispatch_get_main_queue(), ^{
       NSLog(@"用户不使用TouchID,选择手动输入密码");
      });
     }
      break;
     case LAErrorSystemCancel:{
      dispatch_async(dispatch_get_main_queue(), ^{
       NSLog(@"TouchID 被系统取消 (如遇到来电,锁屏,按了Home键等)");
      });
     }
      break;
     case LAErrorPasscodeNotSet:{
      dispatch_async(dispatch_get_main_queue(), ^{
       NSLog(@"TouchID 无法启动,因为用户没有设置密码");
      });
     }
      break;
     case LAErrorTouchIDNotEnrolled:{
      dispatch_async(dispatch_get_main_queue(), ^{
       NSLog(@"TouchID 无法启动,因为用户没有设置TouchID");
      });
     }
      break;
     case LAErrorTouchIDNotAvailable:{
      dispatch_async(dispatch_get_main_queue(), ^{
       NSLog(@"TouchID 无效");
      });
     }
      break;
     case LAErrorTouchIDLockout:{
      dispatch_async(dispatch_get_main_queue(), ^{
       NSLog(@"TouchID 被锁定(连续多次验证TouchID失败,系统需要用户手动输入密码)");
      });
     }
      break;
     case LAErrorAppCancel:{
      dispatch_async(dispatch_get_main_queue(), ^{
       NSLog(@"当前软件被挂起并取消了授权 (如App进入了后台等)");
      });
     }
      break;
     case LAErrorInvalidContext:{
      dispatch_async(dispatch_get_main_queue(), ^{
       NSLog(@"当前软件被挂起并取消了授权 (LAContext对象无效)");
      });
     }
      break;
     default:
      break;
    }
   }
  }];
   
 }else{
  NSLog(@"当前设备不支持TouchID");
 }
}