NSPopUpButton selection to Float Swift 4 - swift

Question

I am trying to get a String value to a Float value from a NSPopUpButton.
E.g. I have 3 number selections. 50, 20, 10. When the user selects one of the numbers I would like a calculation made into a Float value.
I know this may be something very simple but I am new and I can't find anything on Stackoverflow. Any help would be appreciated. Here is an example of the code I have.
#IBOutlet weak var userInput: NSTextField!
#IBOutlet weak var result: NSTextField!
#IBOutlet weak var userMenuSelection: NSPopUpButton!
override func viewDidLoad() {
super.viewDidLoad()
userMenuSelection.removeAllItems()
userMenuSelection.addItems(withTitles: ["50", "20", "10"])
}
#IBAction func pushButtonforResult(_ sender: Any) {
/*
Not sure how to take the selected userMenuSelection and multiply it by the users input to get my result in a float.
E.g. look below. This of course does not work because the menu items are strings.
*/
result.floatValue = userMenuSelection * userInput.floatValue
}
Hope this makes sense to what I am asking.

Answer 1

As you see, your userMenuSelection has titles representing the Float values as String.
You can simply retrieve the selected title and convert it to Float:
#IBAction func pushButtonforResult(_ sender: Any) {
var selectedValue = Float(userMenuSelection.titleOfSelectedItem ?? "0") ?? 0.0
result.floatValue = selectedValue * userInput.floatValue
}

Answer 2

You can try
let arr = ["50", "20", "10"]
//
#IBAction func pushButtonforResult(_ sender: NSPopUpButton) {
let selectedValue = Float(arr[sender.selectedTag()])!
Result.floatValue = selectedValue * userInput.floatValue
// OR
let selectedValue = Float(sender.selectedItem!.title)!
result.floatValue = selectedValue * userInput.floatValue
}