How to get a search bar into an NSToolbar in a Catalyst app?

I've seen some Catalyst apps add a search bar to the NSToolbar and was wondering how I could do the same. Would I have to import AppKit/Cocoa to get an NSSearchField and the actual NSToolbar? Or is there some way with UISearchBars that I am just not seeing? Any help would be great, thanks.

I have tried importing AppKit and Cocoa (Using a bundle loader), but I don't think I had done it right. If anyone has a solid guide on how to do this, please link it.

I also tried creating a UIBarButtonItem with a custom view of a UISearchBar, which doesn't end up rendering anything. (that can be found below)

This is found in a switch case on itemIdentifier.rawValue (in the toolbar itemForIdentifier function)

let search = UISearchBar()
search.sizeToFit()
let button = UIBarButtonItem(customView: search)
button.width = 100
let toolbarItem = NSToolbarItem(itemIdentifier: itemIdentifier, barButtonItem: button)
toolbarItem.isBordered = true
toolbarItem.isEnabled = true
return toolbarItem

Solution

Thanks to mmackh, the search bar can be added in just as easily as any other toolbar item. Thank all of you who looked into this.

https://github.com/mmackh/Catalyst-Helpers

Swift Example

Once you add the files to your project (and in this case your bridging header), just return this as you would any other toolbar item.

let item = NSToolbarItem_Catalyst.searchItem(withItemIdentifier: "searchBar", textDidChangeHandler: { string in
    print(string)
})