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POInheritance Issues in Objective C
 

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    <p>I created an "SDMutableGrid" class so that I could use a grid. It's just a child of NSMutableArray that contains a number for arrays equal to the number of rows in the grid.</p> <p>Currently, the program quits before it really starts and it appears that it is because the methods defined for NSMutableArray somehow do not apply to SDMutableGrid, anyone know why?</p> <p>Here is the .h :</p> <pre><code>#import &lt;Foundation/Foundation.h&gt; #import "SDDimensions.h" @interface SDMutableGrid : NSMutableArray { SDDimensions dimensions; } @property (nonatomic) SDDimensions dimensions; - (id)initWithDimensions:(SDDimensions)newDimensions; - (void)addObject:(id)anObject toRow:(NSUInteger)row; @end </code></pre> <p>Here is the .m :</p> <pre><code>#import "SDMutableGrid.h" @implementation SDMutableGrid @synthesize dimensions; - (void)setDimensions:(SDDimensions)newDimensions { if (newDimensions.width &lt; dimensions.width) { NSMutableArray *anArray; NSRange aRange = NSMakeRange(newDimensions.width, dimensions.width - newDimensions.width); for (NSUInteger i = 0; i &lt; MIN(dimensions.height,newDimensions.height); i++) { anArray = [self objectAtIndex:i]; [anArray removeObjectsInRange:aRange]; } } dimensions.width = newDimensions.width; if (newDimensions.height &gt; dimensions.height) { for (NSUInteger i = dimensions.height; i &lt; newDimensions.height; i++) { [self addObject:[[NSMutableArray alloc] initWithCapacity:dimensions.width]]; } } else if (newDimensions.height &lt; dimensions.height) { [self removeObjectsInRange:NSMakeRange(newDimensions.height, dimensions.height - newDimensions.height)]; } dimensions.height = newDimensions.height; } - (id)initWithDimensions:(SDDimensions)newDimensions { if (self = [super initWithCapacity:newDimensions.height]) { NSMutableArray *anArray; for (NSUInteger i = 0; i &lt; newDimensions.height; i++) { anArray = [[NSMutableArray alloc] initWithCapacity:newDimensions.width]; NSLog(@"Got this far"); [self addObject:anArray]; NSLog(@"woot"); [anArray release]; } NSLog(@"Finished Initializing grid"); } return self; } - (void)addObject:(id)anObject toRow:(NSUInteger)row { [[self objectAtIndex:row] addObject:anObject]; } @end </code></pre> <p>And here is what is appearing on the console:</p> <p><strong>2009-08-12 15:27:02.076 Flipswitch[1756:20b] <em></strong> Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '<strong></em> -[NSMutableArray initWithCapacity:]: method only defined for abstract class. Define -[SDMutableGrid initWithCapacity:]!' 2009-08-12 15:27:02.080 Flipswitch[1756:20b] Stack: ( 807902715, 2536648251, 808283725, 808264737, 13690, 11018, 10185, 814713539, 814750709, 814739251, 814722434, 814748641, 839148405, 807687520, 807683624, 814715661, 814752238, 10052, 9906 )</strong></p>
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