How to tell if object is in NSArray?

问题

Is there a way to tell if a certain object is in an NSArray? The way I am adding objects to my array makes it possible for the same object to be added multiple times and I wanted to see if there was a way to see if it was already there (anywhere) in that array.

回答1:

The NSArray containsObject: method is precisely for this purpose, its full signature being:

- (BOOL)containsObject:(id)anObject

See the full NSArray Class Reference docs for more information.

回答2:

if([yourArray indexOfObject:yourObject] == NSNotFound) {
     // your object is not in here
}

Edit: middaparkas approach is way better (if you don't want the index …)!

来源：https://stackoverflow.com/questions/6256785/how-to-tell-if-object-is-in-nsarray