无法处理 NSPhotoLibraryAddUsageDescription 的权限答案

【问题标题】：Not able to handle permission for NSPhotoLibraryAddUsageDescription无法处理 NSPhotoLibraryAddUsageDescription 的权限
【发布时间】：2018-03-02 13:51:15
【问题描述】：

我正在使用uiactivityviewcontroller；其中有一个将照片保存到设备的选项。

所以我添加了NSPhotoLibraryAddUsageDescription 密钥以获得许可，

但无法处理权限，一旦用户点击Don't allow，当再次点击相同选项保存照片时没有任何反应；

我看到了这个链接：Determine if the access to photo library is set or not - PHPhotoLibrary

但这并没有帮助；在这两种情况下（允许或不允许）它都返回PHAuthorizationStatusNotDetermined

我已经尝试过PHPhotoLibrary.requestAuthorization。它适用于读取和写入权限。我只想添加照片；所以只需要写权限。

有没有办法处理这个权限？

【问题讨论】：

您能否发布您的代码请求访问照片库以及保存您的照片的代码
当我使用 UIActivityViewController 时，它会自动完成；我只需要在 info.plist 文件中添加键 'NSPhotoLibraryAddUsageDescription'。保存选项由控制器 @Spads 自动给出

标签： swift ios11 uiactivityviewcontroller phphotolibrary

【解决方案1】：

我也遇到了同样的问题，这是我的解决方案，我是怎么处理的。

 NSArray *dataToShare= @[@"Test",@"",[self contentURLofCurrentPreviewItem]];
                UIActivityViewController* activityViewController =
                [[UIActivityViewController alloc] initWithActivityItems:dataToShare
                                                  applicationActivities:nil];


        if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone) {
            [self presentViewController:activityViewController animated:YES completion:nil];
        }
        else {
            // Change Rect to position Popover
            UIPopoverController *popup = [[UIPopoverController alloc] initWithContentViewController:activityViewController];
            activityViewController.popoverPresentationController.sourceView = view;
            [popup presentPopoverFromRect:view.frame
                                                    inView:view.superview
                                  permittedArrowDirections:UIPopoverArrowDirectionAny
                                                  animated:YES];

        }

        if ([PHPhotoLibrary authorizationStatus] == PHAuthorizationStatusNotDetermined)
        {
            [PHPhotoLibrary requestAuthorization:^(PHAuthorizationStatus status)
             {
                 if (status == PHAuthorizationStatusDenied) {
                     [self showAlert];
                 }
             }];
        }


        [activityViewController setCompletionWithItemsHandler:^(NSString *activityType, BOOL completed, NSArray *returnedItems, NSError *activityError)
         {
             if ([activityType isEqualToString:@"com.apple.UIKit.activity.SaveToCameraRoll"])
             {

             if (![self getaccess])
             {
                 [self showAlert];

             }
             }
         }];

    }


}

}

//检查照片库的访问权限

-(bool)getaccess
{
    PHAuthorizationStatus status = [PHPhotoLibrary authorizationStatus];

if (status == PHAuthorizationStatusAuthorized)
{
    return YES;
    // Access has been granted.
}

else if (status == PHAuthorizationStatusDenied) {
     return NO;
    // Access has been denied.
}
else if (status == PHAuthorizationStatusRestricted)
{
    return NO;
    // Restricted access - normally won't happen.
}
return NO;

}

-(void)showAlert
{
    NSString *message = @"Save Image option required access of Photo Library. Please allow Photos app access for Your App in the Settings application.";


    UIAlertController * alert=   [UIAlertController
                                  alertControllerWithTitle:NSLocalizedString(@"Your App", nil)
                                  message:NSLocalizedString(message,nil)
                                  preferredStyle:UIAlertControllerStyleAlert];

    UIAlertAction *settingsAction = [UIAlertAction actionWithTitle:NSLocalizedString(@"Go To Settings", nil) style:UIAlertActionStyleDefault handler:^(UIAlertAction *action)
    {
         [[UIApplication sharedApplication] openURL:[NSURL URLWithString:UIApplicationOpenSettingsURLString]];
    }];
    [alert addAction:settingsAction];

    UIAlertAction *Cancel = [UIAlertAction actionWithTitle:NSLocalizedString(@"Cancel", nil) style:UIAlertActionStyleDefault handler:^(UIAlertAction *action)
                                     {
                                         //do something when click button
                                     }];
    [alert addAction:Cancel];

    [self presentViewController:alert animated:YES completion:nil];

    }

}

【讨论】：