ios - 如何检查 ios 中的 RequestPermissions？

Question

我需要在我的应用程序中访问照片和 map 。所以我在 plist 文件中添加了相应的功能。但是我需要检查请求是否被允许或拒绝。我不知道该怎么做，请建议我这个。

Answer 1

您必须明确检查不同类型的权限，例如图像/视频、位置、联系人列表等。

1. 图片/视频/音频/文档等

   NSString *mediaType = AVMediaTypeVideo;
   AVAuthorizationStatus authStatus = [AVCaptureDevice authorizationStatusForMediaType:mediaType];
   if(authStatus == AVAuthorizationStatusAuthorized)
   {
      // do your logic
   } else if(authStatus == AVAuthorizationStatusDenied)
   {
        // denied
       [self showSettingsAlert:@"Previously you have denied"];
   } else if(authStatus == AVAuthorizationStatusRestricted)
   {
       // restricted, normally won't happen
      [self showSettingsAlert:@"You have revoke"];
   } else if(authStatus == AVAuthorizationStatusNotDetermined)
   {
       // not determined?!
       [AVCaptureDevice requestAccessForMediaType:mediaType completionHandler:^(BOOL granted)
       {
            if(granted)
            {
                [self openVideoPicker:buttonIndex];
            } else
            {
                [self showSettingsAlert:@"You have denied"];
            }
       }];
   } else
   {
       [self showSettingsAlert:@"You have revoke"];
   }
   

只需根据您的要求更改 AVMediaTypes。

1. 手机联系人列表

   CNAuthorizationStatus status = [CNContactStore authorizationStatusForEntityType:CNEntityTypeContacts];
   if (status == CNAuthorizationStatusDenied || status == CNAuthorizationStatusRestricted)
   {
        //Show Alert Access Denied
        return;
   }
   
   CNContactStore *store = [[CNContactStore alloc] init];
   [store requestAccessForEntityType:CNEntityTypeContacts completionHandler:^(BOOL granted, NSError * _Nullable error)
    {
         // make sure the user granted us access
         if (!granted)
         {
             dispatch_async(dispatch_get_main_queue(), ^{
   
                 //Show Alert Access Denied
                 return;
    }
   
    BOOL success = [store enumerateContactsWithFetchRequest:request error:&fetchError usingBlock:^(CNContact *contact, BOOL *stop)
    {
        // build array of contacts
        NSMutableArray *contacts = [NSMutableArray array];
   
        NSError *fetchError;
        CNContactFetchRequest *request = [[CNContactFetchRequest alloc] initWithKeysToFetch:@[CNContactIdentifierKey, [CNContactFormatter descriptorForRequiredKeysForStyle:CNContactFormatterStyleFullName], CNContactPhoneNumbersKey, CNContactGivenNameKey, CNContactFamilyNameKey]];
        [contacts addObject:contact];
    }];
    if (!success)
    {
        [UIUtil showWarningAlert:fetchError.localizedDescription onController:self];
        return;
    }
   

   将此代码放入将处理此类权限验证的函数中。

2. 对于位置，您必须实现CLLocationManagerDelegate，这两个函数将为您提供位置信息。

   - (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations 
   {
       currentLocation = [locations objectAtIndex:0];
       [locationManager stopUpdatingLocation];
   
       latitude = [NSString stringWithFormat:@"%f", currentLocation.coordinate.latitude];
       longitude = [NSString stringWithFormat:@"%f", currentLocation.coordinate.longitude];
   }
   
   -(void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error
   {
        if (error.domain == kCLErrorDomain && error.code == kCLErrorDenied)
        {
            [locationManager stopUpdatingLocation];
            [self showSettingsAlert:@"You have denied Location Permission"];
        }
   }
   

不要忘记为这些代码导入适当的包。