XOR Objective-c

As Objective-C is a superset of C, you simply use the XOR operator from C, which is ^.

XOR

if(!!var1 != !!var2){   NSLog(@"XOR condition");}

Exclamation marks convert vars to BOOL (real conversion, not casting)
So this solution works even if your variables are not BOOL.

!!(0|nil) ≡ 0  !!(any other number|object) ≡ 1

This is useful in cases when you want to be sure that only one of vars is nonnil.

iphone objective-c logic

You could add more clearness to the code that Ishu suggests by doing this:

#define XOR !=

and then you just write:

if (var1 XOR var2) {    ...}

truth table output:
[T XOR T => F; T != T => F],
[T XOR F => T; T != F => T],
[F XOR T => T; F != T => T] and
[F XOR F => F; F != F => F]

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