I'm designing an iOS app with a Q&A section, where every question is its own page. Not every question fits comfortably inside the header.
a) put the heading text below the header bar for every question, leaving just a back arrow there
b) do a only for the questions that don't fit
c) decrease font size for those that don't fit (not a fan of this one -- decreases legibility)
d) ellipsize -- the problem there is cutting off a potentially important part of the question