Why does an NSInteger variable have to be cast to long when used as a format argument?

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You get this warning if you compile on OS X (64-bit), because on that platform NSInteger is defined as long and is a 64-bit integer. The %i format, on the other hand, is for int, which is 32-bit. So the format and the actual parameter do not match in size.

Since NSInteger is 32-bit or 64-bit, depending on the platform, the compiler recommends
to add a cast to long generally.

Update: Since iOS 7 supports 64-bit now as well, you can get the same warning when compiling
for iOS.

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