Do not change the font size for iPhone 6 or iPhone 6+.
People buy these phones to see more content. 6+ displays things a little more than other phones anyway (yes, it has larger pixels, not just more pixels), and if the user wants an even larger display, they can switch the entire phone to zoom mode (like 6+, so and 6, which turns 6+ into big 6, and 6 into big 5).
Just use autorun to arrange things according to screen size.
gnasher729
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