How to expand and collapse parts of NSSplitView pr

Question

I want to replace RBSplitView with NSSplitView in my existing project. The application is now leopard only and I would like to replace RBSplitView with the new NSSplitView shipped with Leopard.

However, I'm missing RBSplitView's handy methods expand and collapse in NSSplitView. How can I expand and collapse parts of NSSplitView programmatically?

Answer 1

I tried the solution above, and found it did not work, as isSubviewCollapsed never returned YES

A combination of the suggestions yielded a result which works

if ([splitViewTop isHidden]) {
    [splitViewTop setHidden:NO];
    [split
     setPosition:previousSplitViewHeight
     ofDividerAtIndex:0];
}
else {
    [splitViewTop setHidden:YES];
}
[split adjustSubviews];

Answer 2

In macOS Sierra, the collapsed property is changed to isCollapsed. Is straight forward just setting the property to true or false. The following code is from my WindowController, where I have two SplitViewItems.

@IBAction func toggleMap(_ sender: Any) {
    if let splitViewController = contentViewController as? NSSplitViewController {
        let splitViewItem = splitViewController.splitViewItems
        if splitViewItem.first!.isCollapsed {
            splitViewItem.first!.isCollapsed = false
        } else if splitViewItem.last!.isCollapsed {
            splitViewItem.last!.isCollapsed = false
        } else {
            if splitViewItem.first!.isCollapsed {
                splitViewItem.first!.isCollapsed = false
            }
            splitViewItem.last!.isCollapsed = true
        }
    }
}

Answer 3

In swift this works

func togglePanel() {
    let splitViewItem = self.mySplitView.arrangedSubviews

    if mySplitView.isSubviewCollapsed(outline.view){
        splitViewItem[0].hidden = false
    } else {
        splitViewItem[0].hidden = true
    }

call this from IBAction, outline is an OutlineViewController with own xib and we need the view hence outline.view, keeping it simple but hope you get the idea

@IBAction func segmentAction(sender: NSSegmentedControl) {
    splitVC?.togglePanel(sender.selectedSegment)
}

and

func togglePanel(segmentID: Int) {
    let splitViewItem = self.mySplitView.arrangedSubviews

    switch segmentID {

    case segmentID:
        if mySplitView.isSubviewCollapsed(splitViewItem[segmentID]) {
            splitViewItem[segmentID].hidden = false
        } else {
            splitViewItem[segmentID].hidden = true
        }
    default:
        break
    }

}

And implement delegate

func splitView(splitView: NSSplitView, shouldHideDividerAtIndex dividerIndex: Int) -> Bool {
    return true
}

And with 10.11 you might just use toggleSidebar action method. How to toggle visibility of NSSplitView subView + hide Pane Splitter divider? https://github.com/Dis3buted/SplitViewController

Answer 4

In El Capitan, this did the trick for me.

splitViewItem.collapsed = YES;