Cannot add UIDocument into an array - objective-c

Question

If I try to add an opened UIDocument into an array I get nothing out. This might be how it is supposed to work, I'm not sure.
- (void)loadDocAtURL:(NSURL *)fileURL withClassName:(NSString *)className {
id doc = [[NSClassFromString(className) alloc] initWithFileURL:fileURL];
[doc openWithCompletionHandler:^(BOOL success) {
if (!success) {
NSLog(#"Failed to open %#", fileURL);
return;
}
NSLog(#"I'm a doc. My class is %#, my title is %#", NSStringFromClass([doc class]), [doc title]);
dispatch_async(dispatch_get_main_queue(), ^{
//[self addOrUpdateEntryWithURL:fileURL metadata:metadata state:state version:version];
[_tableList addObject:doc];
[self.tableView reloadData];
NSLog(#"%d", _tableList.count);
});
}];
};
That NSLog returns: I'm a doc. My class is Song, my title is A New Song
So far so good.
[self.tableView reloadData], reloads the table correctly and the correct number of cells are displayed, only they are empty, this is why:
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
Song *theSong = [tableList objectAtIndex:indexPath.row];
NSLog(#"I am a %#", NSStringFromClass([theSong class]));
UILabel *titleLabel = (UILabel *)[cell viewWithTag:0];
UILabel *lyricLabel = (UILabel *)[cell viewWithTag:1];
NSLog(#"I'm in the table view. My title is %#", [theSong lyric]);
titleLabel.text = theSong.title;
lyricLabel.text = theSong.lyric;
[theSong closeWithCompletionHandler:^(BOOL success) {
// Check status
if (!success) {
NSLog(#"Failed to close %#", theSong.fileURL);
// Continue anyway...
}
}];
return cell;
}
Those two NSLogs output: I am a (null) and I'm in the table view. My title is (null)
When I breakpoint and look at theSong after its grabbed, it is completely empty.
This is leading me to think that you cannot open a UIDocument, stick it in an array and pull it back out of the array. Am I correct?

Answer 1

If the song is nil, then almost certainly the array is nil. I notice you refer to it both as _tableList and as tableList. My guess is those are not the same pointer.
Try using _tableList in cellForRowAtIndexPath. Log it to confirm that it's non-nil.
You can disprove your theory about the array by logging [_tableList lastObject] right after you add it.