Handling duplicate selects in NSTokenField

Question

How do I prevent duplicate select from an Array in an NSTokenField. I've implemented the delegate completionsForSubstring.

Answer 1

The best method I would say is to implement the delegate shouldAddObjects. Write the following code in the delegate.

NSString *newVal = [[tokens objectAtIndex:0] description];
NSArray *aray = [tokenField objectValue];
for (NSString * token in aray) {
    @try{
        if ([token isEqual:newVal]){
            return nil;
        }
    }
    @catch (NSException *exception) {
        ;
    }
}