iOS Restrict IOS app update to iPhone 6 size screens and larger?

[whitedragon101]

I am localising my app into German and the language is very large taking up 30% more space than English (sometimes more). This means The iPhone 5/5s and SE sizes are a nightmare.

I would like to restrict this update to phones iPhone 6 size and larger as they have enough room that only tweaks are required. Hopefully this would be fine as 5/5s are disappearing and SE is a very small part of the market.

If not. Is there a way to set global font sizes by device size? I.e

if(screen size < iPhone 6)
{
set appGlobalTextSizeTitle = 10;
set appGlobalTextSizeBody = 8;
}