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copied!<p>A couple things. </p> <ol> <li><p>Your createFruit method is wrong. It should be:</p> <pre>+ (Fruit *) createFruit { //autorelease, because the Create Rule only applies to CoreFoundation functions return [[[Fruit alloc] init] autorelease]; }</pre></li> <li><p>Instance variables are <code>@protected</code> by default. That means they can be directly accessed by the class and any subclasses. You can make it <code>@protected</code>, <code>@private</code>, <code>@public</code>, and <a href="https://stackoverflow.com/questions/772600/what-does-the-package-directive-do-in-objective-c"><code>@package</code></a>. You do so like this:</p> <pre>@interface Apple : Fruit { @private int iSeed } ... @end</pre></li> <li><p>If you want an instance variable to be readonly, then don't declare it as <code>@public</code>, but make a getter for it. For example:</p> <pre>- (int) iSeeds { return iSeeds; }</pre></li> <li><p>However, since the instance variable is readonly, you can't set it externally. The way around this is to give the Apple a iSeed value during initialization:</p> <pre>- (id) initWithSeeds:(int)aniSeedValue { if (self = [super init]) { iSeed = aniSeedValue; } return self; }</pre> <p>Then make your <code>createAppleWithColor:(int)iSeeds</code> method like:</p> <pre>+ (Fruit *) createAppleWithColor:(int)iSeeds { return [[[Apple alloc] initWithSeeds:iSeeds] autorelease]; }</pre></li> <li><p>Finally, you should read the <a href="http://developer.apple.com/mac/library/documentation/cocoa/conceptual/CodingGuidelines/CodingGuidelines.html" rel="nofollow noreferrer">Naming Conventions guide</a> and the <a href="http://developer.apple.com/mac/library/documentation/cocoa/conceptual/MemoryMgmt/MemoryMgmt.html" rel="nofollow noreferrer">Memory Management guide</a>.</p></li> </ol>

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