如何判断 object 是否在 NSArray 中？

Question

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.

Answer 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.

Answer 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 …)!