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POObjective C, how to use classes.
 

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    <p>I've just started working with Objective C, and either my design is wrong, or my implementation is wrong, or both, I don't even know. </p> <p>I've given relevant information below, but my expectations are this:</p> <p><em><strong>Create PlayerBullet class, so that I can just allocate data pre-defined in the class file, such as, sprite file, speed, sound when fired, etc.</em></strong></p> <p>I assume that'd be better than setting that data in the playerShoot function every time a bullet is made. However, I'm getting errors that suggest insertObject:atIndex:] object cannot be nil. </p> <pre><code>//PlayerBullet.h #import "cocos2d.h" @interface PlayerBullet: CCSprite{ CCSprite *projectile; } property (nonatomic, assign) CCSprite *projectile; @end </code></pre> <hr> <pre><code>//PlayerBullet.m #import "PlayerBullet.h" @implementation PlayerBullet -(id)init{ projectile = [CCSprite spriteWithFile:@"projectile.png"]; return self; } @end </code></pre> <hr> <pre><code> //HelloWorldLayer.h ... @interface HellowWorldLayer: CCLayerColor{ PlayerBullet *playerBullet; } ... </code></pre> <hr> <pre><code> //HelloWorldLayer.m ... -(void)playerShoot:(ccTime)dt{ CGSize winSize = [[CCDirector sharedDirector] winSize]; playerBullet = [[PlayerBullet alloc] init]; playerBullet.projectile.tag = 2; [_projectiles addObject:playerBullet.projectile]; playerBullet.projectile.position = ccp(player.position.x,player.position.y); [self addChild:playerBullet.projectile]; [playerBullet.projectile runAction: [CCSequence actions: [CCMoveTo actionWithDuration:1.5 position:ccp(player.position.x,winSize.height)], [CCCallBlockN actionWithBlock:^(CCNode *node){ [node removeFromParentAndCleanup:YES]; [_projectiles removeObject:node]; }], nil]]; } </code></pre>
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    1. COThere are many books on getting started with Objective-C and iOS development, they would be a good place to start.
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