How to adjust Splitview size?

Unable to understand what you mean.

I've got a splitview with 3 columns,

Are the 3 columns in the detailView ?

Because I do not see how you would create a splitView with 3 parts

How do you define these 3 columns ?

I can't quite remember, but I think I jsut added another Custom View to the Split View. I don't have anything called a Detail View.

How did you create the splitView ? In IB ?K In code ?

In IB, selecting spliView controller and dragging in the storyboard ?

If so, XCode creates automatically 4 controllers:

- a MasterView / SplitViewController

- connected to a Nav controller, itself connected to a tableViewController

- a UIViewController

From there, what are the 3 columns ?

- just 3 UIViews ?

- where do you create them ?

If your setup is different, please explain what it is.

I added a screenshot, but it's not displaying.

/servlet/JiveServlet/downloadImage/2-378606-176989/Screenshot+5.png

Yes, I'm talking about Storyboard in Interface Builder. I have

View Controller

> View

>> Split View
>>> Custom View
>>> Custom View

>>> Custom View
Each of the Custom Views has a different view, e.g. PDF View, Thumbnail, and OutlineView.

However, surely there should be a known reason why a SplitView's size is locked?

It's something to do with the Auto-resizing. When I remove all the auto-sizing red arrows, I can adjust the Split. But as soon as I make each sub-view resize (so that they grow with the window), then the split stops working.
But then that means my views don't size to the window.

I've changed the design to have one SplitView (two sub-views) one of which is a Tab View.

Do I have to set separate (or similar?) auto-resizing for the View, the SplitView, the CustomView, the TabView, the subView and the View it contains.....?

And why the Tab View tabs stick out the top of the window, I have no idea! (See another picture)

Cannot download the image, that would help.

How do you create the splitView ? Do you drag a splitViewController in IB ?