itemThumbnailData(for:)
Asks the delegate for the thumbnail image data to display on the invitation.
Declaration
optional func itemThumbnailData(for csc: UICloudSharingController) -> Data?Discussion
Implement this method to return image data representing the shared recording. Returning nil tells the UICloudSharingController instance to display the generic image. Not implementing this method is the same as returning nil.
itemThumbnailData(for:) is called only when creating a new share. For an existing share, the thumbnail image is retrieved from the share using the CKShareThumbnailImageDataKey key.
The following code shows an example of retrieving the image data from a data set stored in an asset catalog found in the main bundle.
- (nullable NSData *)itemThumbnailDataForCloudSharingController:(UICloudSharingController *)csc
{
NSDataAsset *icon = [[NSDataAsset alloc] initWithName:@"thumbnail"];
return [icon data];
}