How do I declare an array as a constant in Objective-c?

Question

The following code is giving me errors:

//  constants.h
extern NSArray const *testArray;

//  constants.m
NSArray const *testArray =          


        

Answer 1

Here's a macro to do it in one line for a static instance in a method scope.

#define STATIC_ARRAY(x, ...)   \
        static NSArray* x=nil; \
        static dispatch_once_t x##onceToken; \
        dispatch_once(&x##onceToken, ^{ x = @[ __VA_ARGS__ ]; });

Use example

    STATIC_ARRAY(foo, @"thing1", @"thing2", [NSObject new]);