/// <param name="url">The shared document's URL.</param>
/// <param name="completionHandler">
/// <para>An action the system calls subsequent to the creation of a placeholder.</para>
/// <para tool="nullallowed">This parameter can be <see langword="null" />.</para>
/// </param>
/// <summary>When implemented by the developer, creates a specified placeholder for a previously defined URL.</summary>
/// <remarks>
/// <para>The developer must override this method. This method is called to provide a placeholder for documents that are returned by the Document Picker but that are not locally stored.</para>
/// <para tool="threads">This can be used from a background thread.</para>
/// </remarks>
public override void ProvidePlaceholderAtUrl(NSUrl url, Action <NSError> completionHandler)
{
try
{
string identifier = this.GetPersistentIdentifier(url);
ItemMetadata itemMetadata = this.StorageManager.GetItemMetadata(identifier);
if (!itemMetadata.IsExists)
{
completionHandler?.Invoke(NSFileProviderErrorFactory.CreateNonExistentItemError(identifier));
return;
}
NSUrl placeholderUrl = NSFileProviderManager.GetPlaceholderUrl(url);
NSError error;
NSFileManager.DefaultManager.CreateDirectory(placeholderUrl.RemoveLastPathComponent(), true, null, out error);
if (error != null)
{
completionHandler?.Invoke(error);
return;
}
INSFileProviderItem providerItem = ProviderItem.CreateFromMetadata(itemMetadata);
NSFileProviderManager.WritePlaceholder(placeholderUrl, providerItem, out error);
completionHandler?.Invoke(error);
}
catch (Exception ex)
{
NSError error = this.MapError(ex);
completionHandler?.Invoke(error);
}
}
private void LoadArExperienceIfRequired()
{
NSUrl experienceURLValidator(string URL)
{
if (URL.Contains("https"))
{
return(NSUrl.FromString(URL));
}
else
{
NSUrl relativeArExperienceURL = NSUrl.FromString(currentArExperience.Path);
string bundleSubdirectory = "ARchitectExamples/" + relativeArExperienceURL.RemoveLastPathComponent().AbsoluteString;
NSUrl bundleArExperienceURL = NSBundle.MainBundle.GetUrlForResource("index", "html", bundleSubdirectory);
return(bundleArExperienceURL);
}
}
NSUrl fullArExperienceURL = experienceURLValidator(currentArExperience.Path);
if (loadedArExperienceNavigation == null || (loadedArExperienceNavigation != null && !loadedArExperienceNavigation.OriginalURL.Equals(fullArExperienceURL)))
{
loadingArExperienceNavigation = architectView.LoadArchitectWorldFromURL(fullArExperienceURL);
}
}