Objective C - Create a multi-dimensional array with the dimensions specified at initialisation

Question

I am trying to create a class where the width and height of a 2 dimensional array can be dynamically created at the point of initialisation with init parameters.

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Answer 1

Here is another pure Objective C Version

#import foundation.h

@interface ZTwoDimensionalArray : NSObject{

    @package 
    NSMutableArray* _array;
    int _rows, _columns;
}

-(id) initWIthRows:(int)numberOfRows andColumns:(int) numberOfColumns;

-(id) getObjectAtRow:(int) row andColumn:(int)column;

-(void) setObject:(id) anObject atRow:(int) row andColumn:(int)column;
@end



#import "ZTwoDimensionalArray.h"

@implementation ZTwoDimensionalArray

-(id) initWIthRows:(int)numberOfRows andColumns:(int) numberOfColumns{

    if (self = [super init]) {
        _array = [NSMutableArray initWithCapacity:numberOfRows*numberOfColumns];
        _rows = numberOfRows;
        _columns = numberOfColumns;
    }
    return self;
}

-(id) getObjectAtRow:(int) row andColumn:(int)column{

    return [_array objectAtIndex: row*_rows + column];
}

-(void) setObject:(id) anObject atRow:(int) row andColumn:(int)column{

    [_array insertObject:anObject atIndex:row*_rows + column];
}

-(void) dealloc{

    [_array release];
}
@end