How to change the colour of the 'Cancel' button on the UISearchBar in Swift

Question

I have added a UISearchBar to the top of my PFQueryTableViewController. I have changed the colour of the searchBar to be the colour of my app, but

Answer 1

With the Swift 4.0 RELEASE 2017-09-19 toolchain, this worked:

    let cancelButtonAttributes = [NSAttributedStringKey.foregroundColor: UIColor.white]
    UIBarButtonItem.appearance(whenContainedInInstancesOf: [UISearchBar.self]).setTitleTextAttributes(cancelButtonAttributes, for: .normal)