Hello… I did not buy/take the book, though I’m a bit interested by it. I downloaded DropCharge by App Store, the version submitted for this tutorial. I noticed that after playing for 1-2 minutes and more the same round, the fps start to decrease, and that becomes really noticeable on my iPhone 5s, so I assume the memory leak is kinda hard. I don’t know if it’s a bug that affects that version in particular, or the current book version. Though learning to get rid of memory leaks could be a good programming excercise, it makes me trust less the book.
Could you check?