When to use a colon with a @selector

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As mentioned by boltClock, the character you are referring to is actually a colon. The difference between @selector(method) and @selector(method:) is the method signature. The 2nd variant expects a parameter to be passed.

@selector(method) would expect the method: -(void)method

@selector(method:) would expect the method: -(void)method:(id)someParameter

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