Open Radar

 
Summary:

You cannot set the tag of a custom NSView in Interface Builder. This is a pain :) (Especially now that more people will be using them thanks to @IBDesignable and @IBInspectable support)

Steps to Reproduce:

1. Create a custom NSView 
2. Try to set its tag via the Attributes Inspector

Expected Results:

It just works, like with any other NSView.

Actual Results:

It doesn’t work — the option is greyed out.

Workaround:

I actually had to do this :)

extension NSView
{
    func viewWithCustomTag(customTag:Int) -> NSView?
    {
        //
        // Iterates over subviews and returns the view with the specified custom tag.
        // The custom view must implement the CustomTaggable protocol.
        //
        // (Why we can’t use regular tags in custom NSViews is beyond me.)
        //
        for view in subviews
        {
            if let view = view as? NSView, customTaggableView = view as? CustomTaggable
            {
                if customTaggableView.customTag == customTag
                {
                    return view
                }
            }
        }
        return nil
    }
}

protocol CustomTaggable
{
    var customTag:Int {get set}
}


@IBDesignable
class MyView: NSView, CustomTaggable
{
    
    @IBInspectable var customTag:Int = -1

    // …