Add subtitle under the title in navigation bar controller in Xcode

So I'm wanting to add a "subtitle" under the title in the navigation bar in navigation controller.

Mostly everything I look up so far wants me to use CGRect. I don't know a whole lot what that is and it sounds like its wanting me to create an entire new view which is not what I am wanting to do.

My question is, is there a dot method to adding a subtitle view easily?

The closest thing I found was posted on stack overflow and here is the link:

Create a subtitle in navigationbar

Apparently last year this worked but now I am getting errors and it's in my viewDidLoad...

I tried this:

self.navigationController?.navigationItem.prompt = "Subtitle Here"

It's the only thing that won't show any errors but still doesn't work. It literally does nothing. At least nothing visible at run time.

On a side note, swift is preferred. Thanks!

Though there is a solution but it has some known issues

Solution is writing a function like this

func setTitle(title:String, subtitle:String) -> UIView {
    let titleLabel = UILabel(frame: CGRectMake(0, -2, 0, 0))

    titleLabel.backgroundColor = UIColor.clearColor()
    titleLabel.textColor = UIColor.grayColor()
    titleLabel.font = UIFont.boldSystemFontOfSize(17)
    titleLabel.text = title
    titleLabel.sizeToFit()

    let subtitleLabel = UILabel(frame: CGRectMake(0, 18, 0, 0))
    subtitleLabel.backgroundColor = UIColor.clearColor()
    subtitleLabel.textColor = UIColor.blackColor()
    subtitleLabel.font = UIFont.systemFontOfSize(12)
    subtitleLabel.text = subtitle
    subtitleLabel.sizeToFit()

    let titleView = UIView(frame: CGRectMake(0, 0, max(titleLabel.frame.size.width, subtitleLabel.frame.size.width), 30))
    titleView.addSubview(titleLabel)
    titleView.addSubview(subtitleLabel)

    let widthDiff = subtitleLabel.frame.size.width - titleLabel.frame.size.width

    if widthDiff < 0 {
        let newX = widthDiff / 2
        subtitleLabel.frame.origin.x = abs(newX)
    } else {
        let newX = widthDiff / 2
        titleLabel.frame.origin.x = newX
    }

    return titleView
}

Using this function for custom navigation title view in viewDidLoad

self.navigationItem.titleView = setTitle("Title", subtitle: "SubTitle")

Only known issue is that if subtitle becomes very large than the misplacement occurs.

Final Outcome

Source: https://gist.github.com/nazywamsiepawel/0166e8a71d74e96c7898