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POView Based NSOutlineView Drawing Child Views Atop Parent Views
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  1. POView Based NSOutlineView Drawing Child Views Atop Parent Views
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    copied!<p>Using NSOutlineView + NSTreeController + Core Data is resulting in odd outline view layout. As you can see in the images below, the outline view creates a space for the 'Child' when the 'Parent' is expanded but instead draws the 'Child' on top of the 'Parent'. I created a button that when pressed calls the [outlineVIew reloadData] method which causes the view to draw correctly. </p> <p>Core Data model:</p> <ul> <li>parent</li> <li>children</li> <li>isLeaf</li> <li>name</li> </ul> <p>My xib setup:</p> <ul> <li>NSOutlineView delegate is set to File's Owner</li> <li>NSTreeController is bound to my documents Core Data context</li> <li>NSTableColumn is bound to NSTreeController.arrangedObjects</li> <li>NSTextField is bound to NSTableCellView.objectValue.name</li> </ul> <p>NSPersistentDocument Class:</p> <pre><code>- (void)windowControllerDidLoadNib:(NSWindowController *)aController { [super windowControllerDidLoadNib:aController]; Node *parent = [self createNodeOfTypeString:@"Node"]; Node *child = [self createNodeOfTypeString:@"Node"]; parent.name = @"Parent"; parent.isLeaf = NO; [parent addChildrenObject:child]; child.name = @"Child"; child.isLeaf = YES; [self.treeController addObject:parent]; } - (id)outlineView:(NSOutlineView *)ov objectValueForTableColumn:(NSTableColumn *)tableColumn byItem:(id)item { return [item representedObject]; } - (NSView *)outlineView:(NSOutlineView *)ov viewForTableColumn:(NSTableColumn *)tableColumn item:(id)item { if ([[item representedObject] isKindOfClass:[Node class]]) { // Everything is setup in bindings return [ov makeViewWithIdentifier:@"MainCell" owner:self]; } return nil; } </code></pre> <p>Results:</p> <p>Outline View With Parent Collapsed</p> <p><img src="https://i.stack.imgur.com/bpExK.png" alt="Outline View With Parent Collapsed"></p> <p>Outline View With Parent Expanded and Child Drawn Atop</p> <p><img src="https://i.stack.imgur.com/JIIIL.png" alt="Outline View With Parent Expanded and Child Drawn Atop"></p>
 

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