NSOutlineView Data Source not called in Mac OS 10.10 - objective-c

Question

My app has a cell-based NSOutlineView which its data source is a NSMutableArray. In the initialisation, my app loads the NSMutableArray from a text file. Then, the NSOutlineView will be populated with the NSMutableArray.
NSOutlineView is populated with the NSMutableArray prior to OSX 10.10. In OSX 10.10, the NSOutlineView is empty, i.e. no data is displayed. I put the NSLog in the data source methods and found that in 10.10, only - (NSInteger)outlineView:(NSOutlineView *)outlineView numberOfChildrenOfItem:(id)item is called. The other 3 data source methods are not called.
I don't have OSX 10.10 to debug for this issue. Please help.
#interface AppController : NSObject {
...
IBOutlet NSOutlineView *outlineViewCmdSet;
}
#pragma OutlineView for CmdSet
// Data Source methods
- (NSInteger)outlineView:(NSOutlineView *)outlineView numberOfChildrenOfItem:(id)item {
return (item == nil) ? [cmdTree count] : [item numberOfChildren];
}
- (BOOL)outlineView:(NSOutlineView *)outlineView isItemExpandable:(id)item {
return (item == nil) ? YES : [item isExpandable];
}
- (id)outlineView:(NSOutlineView *)outlineView child:(NSInteger)index ofItem:(id)item {
return (item == nil) ? [cmdTree objectAtIndex:index] : [[item children] objectAtIndex:index];
}
- (id)outlineView:(NSOutlineView *)outlineView objectValueForTableColumn:(NSTableColumn *)tableColumn byItem:(id)item {
return [item nodeName];
}
// Delegate methods
- (BOOL)outlineView:(NSOutlineView *)outlineView shouldEditTableColumn:(NSTableColumn *)tableColumn item:(id)item {
return NO;
}
// Drag command to ScriptEditor
- (BOOL)outlineView:(NSOutlineView *)outlineView writeItems:(NSArray *)items toPasteboard:(NSPasteboard *)pboard {
// Single Selection. items array has only 1 object
TreeItem *item = [items objectAtIndex:0];
if ([item isExpandable]) // Group Name
{
return NO;
}
else // Command Name
{
// Copy the Command Name to the pasteboard.
[pboard declareTypes:[NSArray arrayWithObject:CommandTreeViewDataType]
owner:self];
[pboard setString:[item nodeName] forType:CommandTreeViewDataType];
return YES;
}
}

Answer 1

Thanks everyone. I have fixed this issue by moving the initialisation of the Mutable Array from applicationDidFinishLaunching to awakeFromNib.
Strangely enough, prior to 10.10, applicationDidFinishLaunching is called before the OutlineView data source methods but not in 10.10. Anybody has any idea of this?