C 2 dimensional array in Objective-c

Question

Im new to Objective-c, and what im trying to do is to create a 2 dimensional array of integers.

I know i can use C, in the following way:

int levelData[3][4] = {{1,1,1,1}, {1,0,0,1}, {1,1,1,1}};

Thing is, i want other other classes to be able to acces this data, so i have to include this variable in the header file, this is where the problem is:

declaring as int **levelData, int levelData[3][4] or whatsoever doesnt work.

Can anyone help me?

AndersK · Accepted Answer · 2010-12-23 13:01:18Z

2

in your .h file you write

extern int levelData[3][4];

in your .m/.c file you write

int levelData[3][4]= {{1,1,1,1},{1,0,0,1},{1,1,1,1}};

EDIT:

at any rate it is better to avoid global variables altogether and instead pass it as a parameter or have it is a ivar in your objective-c class. This avoids strange hard to see dependencies between modules e.g. if a function takes levelData as argument it is clear that the function operates on that argument however by having it global, you can't see easily what a function is using.

edited Dec 23, 2010 at 13:01

answered Dec 23, 2010 at 2:02

AndersK

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2 Comments

Juulie Over a year ago

I get an other error: Undefined symbols: "_levelData", referenced from: _levelData$non_lazy_ptr in Game.o (maybe you meant: _levelData$non_lazy_ptr) ld: symbol(s) not found

Gilad Naor Over a year ago

You need to make sure that the .m/.c file where you define levelData is linked together with Game.o

Juulie · Accepted Answer · 2010-12-23 19:53:42Z

1

Found the solution, i had a static initializer. You cant use those in combination with this.

answered Dec 23, 2010 at 19:53

Juulie

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