Does Objective-C have an even shorter way of writing this line of code?
a = b ? b : c;
That is, a way to say, a is equal to <
a
That's as short as you can get it in Objective-C! That's a nice little test you have there.
The only other short way I could come up with is as follows (I wouldn't recommend it for readability reasons and it isn't as short as yours!):
if (b) a = b; else a = c;