change title font of map callouts swift

Question

I would like to know if there is any way to change title font without creating a custom view? Something like this:

annotation.title.font = UIFont.systemFontOfSize(12.0)

I searched around, everyone says that I have to create a custom view like this tutorial, but it is so complicated and it's in objective-c.

Hope somebody have a simple way to change the font.

Thank you.