Context: I am using AsyncDisplayKit to load a table with text and images. The images are downloaded from the Internet and the image sizes are unknown until the image is finished downloading.
What I'm trying to do: After the image is finished downloading, I want to re-size and layout the cell to accommodate for the image and then re-size and layout the table to accommodate for the new cell height.
What I've done so far: I initially draw the ASTableView with just the text and use the ASNetworkingImage delegate method, imageNode:didLoadImage method to get notified when the image is finished downloading.
- (void)imageNode:(ASNetworkImageNode *)imageNode didLoadImage:(UIImage *)image {
// Scale image downloaded from Internet to fit constrained width
// Set networkImageNode to scaled image
UIImage *newimage = [self scaleImage:image toConstrainedWidth:CONSTRAINED_WIDTH];
self.networkImageNode.image = newimage;
// Gets the parent cell
// Recalculate cell size and layout the cell (This works!)
MyAsyncTableCellNode *parentCell = ASDisplayNodeFindClass(self, [MyAsyncTableCellNode class]);
[parentCell invalidateCalculatedSize];
[parentCell measure:CGSizeMake(CONSTRAINED_WIDTH, MAXFLOAT)];
[parentCell layout];
// Attempting to re-layout the table to shift the table cells
// to accommodate for the new cell height (ALL these do NOT work!)
MyAsyncTableViewController *parentTableViewController = ASDisplayNodeFindClass(self, [MyAsyncTableViewController class]);
// Attempt #1
[parentTableViewController.asyncTableView reloadData];
// Attempt #2
[parentTableViewController.asyncTableView beginUpdates];
[parentTableViewController.asyncTableView endUpdates];
}
I'm able to successfully re-calculate the size of the individual cell and re-layout and draw the cell to fit the downloaded image.
Issues: However, next I need to re-layout the table to shift the other cells down or up to fit the new size of the updated cell. THIS IS WHAT I CANNOT GET TO WORK.
Attempt #1 will re-calculate the subviews of the table and re-layout, but that also reloads all the data, which is not what I want. I want to just re-calculate and re-layout the cells, not reload all the data.
Attempt #2: When using UITableView, doing this will call tableView:heightForRowAtIndexPath and re-layout all the table cells, but unfortunately, for ASTableView this throws a not implemented exception.
Question: How do I programmatically make the ASTableView relayout itself and account for the new cell heights?
