Cocos2D Help: How to synthesize a 2D array object of NSMutableArray?

Question

In my code I have written this but it fails to compile:

In Class1.h:

@interface Class1 : CCSprite
{
    NSMutableArray *leafArr[20][20];
}

@property(readwrite, assign) NSMutableArray *leafArr; 
@end

In Class1.m:

@implementation

@synthesize leafArr[20][20];
@end

But this fails to compile, please can you tell me how to make set and set method for a 2D array?

Antonio MG · Accepted Answer · 2012-03-28 07:36:51Z

2

There's no way of creating a 2D array in Obj-C, the only thing you can do is create a normal array, and then add arrays to it.

@interface Class1 : CCSprite
{
    NSMutableArray *leafArr;
}

@property(readwrite, assign) NSMutableArray *leafArr; 
@end

And you add elements with:

[leafArr addObject:mySecondArray];

answered Mar 28, 2012 at 7:36

Antonio MG

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1 Comment

Shahnawaz Over a year ago

Okay thanks, give me a further suggestion then. I need to display some leaves all over the screen in 5 by 10 matrix, as in 5 rows and 10 columns. So how do you suggest I do this? I would of-course make a sprite and add them to the array to keep count. But can you show me how to maintain this array?

Spudley · Accepted Answer · 2012-08-15 17:51:07Z

1

int str2Darray[9][9] = { 

    {-1, -1, -1, 1, 1, 1, -1, -1, -1}, 
    {-1, -1, -1, 1, 1, 1, -1, -1, -1}, 
    {-1, -1, -1, 1, 1, 1, -1, -1, -1}, 
      {1, 1, 1, 1, 1, 1, 1, 1, 1}, 
      {1, 1, 1, 1, 0, 1, 1, 1, 1}, 
      {1, 1, 1, 1, 1, 1, 1, 1, 1}, 
    {-1, -1, -1, 1, 1, 1, -1, -1, -1}, 
    {-1, -1, -1, 1, 1, 1, -1, -1, -1}, 
    {-1, -1, -1, 1, 1, 1, -1, -1, -1}, 

};

You can define 5 x 10 matrics as above in .m file. Define flag for leaves in 1 2d array & value into another 2d array. check at the time of display according to your requirement.

edited Aug 15, 2012 at 17:51

Spudley

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answered Aug 15, 2012 at 13:20

Dhaval

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