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Possible Duplicate:
“static const” vs “#define” in C
In Objective-C what is the difference between the following two lines:
#define myInteger 5
static const NSInteger myInteger = 5;
Assume they’re in MyClass.m above the implementation directive.
is a preprocessor macro. The preprocessor will replace every occurrence of
myIntegerwith5before the compiler is started. It’s not a variable, it’s just sort of an automatic find-and-replace mechanism.This is a "real" variable that is constant (can’t be changed after declaration). Static means that it will be a shared variable across multiple calls to that block.