Creating a scrollview programatically in Swift

In the previous post about scrollviews I still used the interface builder to create the scrollview. While that worked I still had problems getting it to scroll right. For some reason the scrollview would at times auto-scroll to the upper-left corner. And as so often, I do not have the time to spend more time on this problem. So I decided to try an alternative solution in which I create the scrollview and the document view programatically. Sadly, there are little or no examples out on this, so I had to experiment just a little. This is what I came up with:

class MyDocumentWindowController: NSWindowController {

    

    

    override func windowDidLoad() {

        

        

        // Create scrollview

        

        let scrollView = NSScrollView(frame: window!.contentView!.frame)

        

        scrollView.hasHorizontalScroller = true

        scrollView.hasVerticalScroller = true

        scrollView.autohidesScrollers = true

        scrollView.borderType = NSBorderType.NoBorder

        scrollView.autoresizingMask = NSAutoresizingMaskOptions(arrayLiteral: .ViewWidthSizable, .ViewHeightSizable)

        

        

        // Create document view

        

        let docView = LineView()

        docView.autoresizingMask = NSAutoresizingMaskOptions(arrayLiteral: .ViewWidthSizable, .ViewHeightSizable)

        

        

        // Add the docView to the scrollView

        

        scrollView.documentView = docView

        

        

        // Add the document to the docView (note: This will trigger an update of its frame based on the available and needed size, hence it must be done after the docView is inserted into the scrollview)

        

        docView.document = document as? MyDocument

        

        

        // Set the scrollview as the window's main view

        

        window!.contentView = scrollView

    }

}

In the didSet method of docView I update the frame as detailed in the previous post on this subject. That is why it needs to be set after the docView is added to the scrollView.

Happy coding...

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