App converted to ARC, now getting warnings about my properties

Question

I just converted my app to ARC, and while it builds fine, I get like 600 warnings, all pertaining to my properties. Such as:

Default propert

Answer 1

ARC is right. You cannot have no memory-management qualifer; you must say assign, retain (or strong which is the same thing), or weak.

Previously, assign was the default. But that is probably not what you want, because is it is the worst possible option - it is an old-style non-ARC weak reference. You either want a smart ARC weak reference (goes to nil when the object goes out of existence) or a strong reference (memory-managed for you by ARC).