remove duplicate values from NSMutableArray in Objective-C

NSArray *copy = [YourMutableArray copy];

 
NSInteger index = [copy count] - 1;

 
for (id object in [copy reverseObjectEnumerator]) {

 
    if ([YourMutableArray
         indexOfObject:object inRange:NSMakeRange(0, index)] 

         != NSNotFound) 

 {
        [YourMutableArray removeObjectAtIndex:index];

 
    }

 
    index--;
}
[copy release];