How to create a plus symbol bar button item

It's one of the provided bar button system items.

let addBarButton = UIBarButtonItem(barButtonSystemItem: .add, target: YOUR_TARGET, action: YOUR_SELECTOR)

I think this is what you are looking for:

screenshot of attribute inspector in Xcode highlighting "System Item" under "Bar Button Item"

Swift 3.0

let addBarButton = UIBarButtonItem(barButtonSystemItem: .add, target: self, action: #selector(ViewController.openSearch))

Related