[ios] When to use NSInteger vs. int

On iOS, it currently does not matter if you use int or NSInteger. It will matter more if/when iOS moves to 64-bits.

Simply put, NSIntegers are ints in 32-bit code (and thus 32-bit long) and longs on 64-bit code (longs in 64-bit code are 64-bit wide, but 32-bit in 32-bit code). The most likely reason for using NSInteger instead of long is to not break existing 32-bit code (which uses ints).

CGFloat has the same issue: on 32-bit (at least on OS X), it's float; on 64-bit, it's double.

Update: With the introduction of the iPhone 5s, iPad Air, iPad Mini with Retina, and iOS 7, you can now build 64-bit code on iOS.

Update 2: Also, using NSIntegers helps with Swift code interoperability.

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