Not able to perform read and write operation in iCloud in .Net Maui Mac

Question

I have set up the app identifier in Apple developer with the document URL set up for iCloud and updated the info.plist and entitlements according to this.

info.plist

<key>NSUbiquitousContainers</key>
<dict>
    <key>iCloud.com.abc.MyApp</key>
    <dict>
        <key>NSUbiquitousContainerIsDocumentScopePublic</key>
        <true/>
        <key>NSUbiquitousContainerName</key>
        <string>MyApp</string>
        <key>NSUbiquitousContainerSupportedFolderLevels</key>
        <string>Any</string>
    </dict>
</dict>

<key>UIFileSharingEnabled</key>
<true/>

<key>LSSupportsOpeningDocumentsInPlace</key>
<true/>

<key>UIBackgroundModes</key>
<array>
    <string>fetch</string>
    <string>remote-notification</string>
</array>

<key>NSUbiquitousContainersUsageDescription</key>
<string>This app uses iCloud containers to store and sync documents.</string>

Entitlement.plist

<key>
<key>com.apple.developer.icloud-container-identifiers</key>
    <array>
        <string>iCloud.com.abc.MyApp</string>
    </array>
    <key>com.apple.developer.icloud-services</key>
    <array>
        <string>CloudDocuments</string>
    </array>
    <key>com.apple.developer.ubiquity-container-identifiers</key>
    <array>
        <string>iCloud.com.abc.MyApp</string>
    </array>
<key>

// Then I am using iCloud CRUD operation in app

// Code snippet

private void DeleteFolderFromICloud()
    {
        try {
            var iCloudDocumentsURL = NSFileManager.DefaultManager.GetUrlForUbiquityContainer(null);
            if (iCloudDocumentsURL != null)
            {
                var path = iCloudDocumentsURL.ToString().Replace("%C3%97", "x");
                var filepath = path.Replace("file://", string.Empty).Replace("%20", " ");
                var destinationdirectoryPath = Path.Combine(
filepath,"MyAppDocuments");
                if (Directory.Exists(destinationdirectoryPath))
                {
                    Directory.Delete(destinationdirectoryPath, recursive: true);
                }
            }
        }catch(Exception ex) {
            LogHandler.LogError(ex);
        }
    }

But in Delete operation gives Exception -> System.IO.IOException: Access to the path '/Users/USERABC/Library/Mobile Documents/iCloud~com~abc~MyApp/MyAppDocuments' is denied.

Answer 1

Hello,

Please use the CreateDirectory and Remove method of NSFileManager.

Apple's API: createFileAtPath:contents:attributes: | Apple Developer Documentation

try {
			var iCloudDocumentsURL = NSFileManager.DefaultManager.GetUrlForUbiquityContainer(null);
			if (iCloudDocumentsURL != null) { var path = iCloudDocumentsURL.ToString().Replace("%C3%97", "x");
				var filepath = path.Replace("file://", string.Empty).Replace("%20", " ");
				var destinationdirectoryPath = Path.Combine(filepath, "MyAppDocuments");
 
                NSFileManager.DefaultManager.CreateDirectory(destinationdirectoryPath, true, null);
 
                if (Directory.Exists(destinationdirectoryPath)) {
                    NSError err = new NSError();
                   NSFileManager.DefaultManager.Remove(destinationdirectoryPath,out err);
				}
				else
				{
				}
 
			}
		} catch (Exception ex) {
 
			Console.WriteLine("--------");
		}

If you want to save the document, please refer to Using iCloud with Xamarin.iOS - Xamarin | Microsoft Learn (Xamarin support has been ended, this Doc applies to MAUI)

Best Regards,

Wenyan Zhang

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