How do I handle iPhone 6S Plus's font size?

iPhone 6S Plus's screen is very big compared to other screen sizes. I can't seem to find a good way to handle the font size of a label without adjusting the size programmatically.

How can I adjust the font size of a label so that it looks smaller on an iPhone 5 and bigger on an iPhone 6 Plus?

Why is the font on my iPhone too big?

, add it to Control Center—go to Settings > Control Center, then choose Text Size). Drag the slider up or down to increase or decrease the text size.

Don't change font sizes for the iPhone 6 or iPhone 6+.

People buy these phones to see more content. The 6+ displays things slightly bigger than the other phones anyway (yes, it has bigger pixels, not just more pixels), and if a user wants an even bigger display they can switch the whole phone to zoom mode (both 6+ and 6; this turns a 6+ into a large 6, and a 6 into a large 5).

Just use autolayout to position things relative to the screen size.