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Editorial Team
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Asked: 2026-06-16T20:24:45+00:00

I am trying to write an if statement that checks an array of objects

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I am trying to write an if statement that checks an array of objects to see if a certain object exists (in this case the word, “NBC” in my array, “channel”). I’m new to this and I’m not sure how to do it in objective c. Please take a look at my code below:

if ([[self.channel objectAtIndex:path.row] containsObject: @"NBC"]) 

{
//Arguments
}

After I run it with this, the simulator crashes and gives this error: 2013-01-02 17:11:44.778 Master Detail Practice App[50056:207] -[__NSCFConstantString containsObject:]: unrecognized selector sent to instance 0xc698

I know my syntax or logic is probably off. Any help will be appreciated. Thank You!

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1 Answer

  1. Editorial Team

    [self.channel objectAtIndex:path.row] is returning you an NSString object. You’re then trying to send that NSString instance a containsObject: message, which it doesn’t know what to do with. Maybe you meant:

    [self.channel objectAtIndex:path.row] isEqualToString:@"NBC"]

    or 

    [self.channel containsObject:@"NBC"]

    But without more context, it’s hard to say.

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