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    <p>The problem is that when you call performSelector there are only two options:</p> <ol> <li>have your selector take no arguments and leave the ":" off the @selector(foo) definition.</li> <li>have your selector take either one or two arguments <strong>which both must be an NSObject or subclass</strong></li> </ol> <p>it is the latter that is messing you up here I suspect.</p> <p>Here are the three forms of <code>performSelector</code>:</p> <pre><code>- (id)performSelector:(SEL)aSelector; - (id)performSelector:(SEL)aSelector withObject:(id)object; - (id)performSelector:(SEL)aSelector withObject:(id)object1 withObject:(id)object2; </code></pre> <p>You'll note that the withObject arguments are all of type <code>id</code> which is an Objective C object.</p> <p>The selector you're trying to use takes a <code>ccTime</code> which is a <code>float</code> and <strong>not</strong> an Objective C object as it's param and that is why things are crashing:</p> <pre><code>-(void)rotate:(ccTime)delta; </code></pre> <p>One option is to make a wrapper method that takes a wrapped <code>ccTime</code> and unwraps it and calls the <code>rotate:(ccTime)</code> method:</p> <pre><code>- (void) wrappedRotate: (NSNumber*) inDelta { [self rotate: [inDelta floatValue]]; } </code></pre> <p>then use</p> <pre><code>selectors[0] = @selector(wrappedRotate:); </code></pre> <p>and then call via:</p> <pre><code>[self schedule: @selector(moveThings:)]); // cocos2d schedule ... - (void) moveThings: (ccTime) dt { [self performSelector: selectors[0] withObject: [NSNumber numberWithFloat: dt]]; ... } </code></pre> <p>One reason you are getting confused is because Cocos2d is using @selector in somewhat more complicated ways (see CCScheduler.m in the CCTimer::initWithTarget:selector:interval: and CCTimer::update: method in particular).</p> <p>disclaimer: code typed into SO so not checked with a compiler, but the essence of what you need should be here.</p>
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    1. CO+1. The system wants to retain the object that is passed, and doing so on a plain float will crash.
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    2. COThanks, this was one problem, also I forgot to say `self.creature`... Because I only wanted one instance of that...
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