Just as it is spelt. Ayfay. (Ay as in day). Because the decision to write Turkish using the Latin alphabet came late to Turkish, (late 1920s) it is fairly logical. I can pronounce Turkish words, even though I sometimes don't have a clue what they mean.
There is, however one letter which I can't pronounce, the g with a ~ over it.
I've tried, but Turkish speaking friends always correct me, and I still can't pronounce it.
It comes up quite a lot in Turkish surnames, o~glu means 'son of'.
You see! even my keyboard can't cope with it.