- (NSArray *)tokenField:(NSTokenField *)tokenField shouldAddObjects:(NSArray *)_tokens atIndex:(NSUInteger)index
- (NSString *)tokenField:(NSTokenField *)tokenField displayStringForRepresentedObject:(id)representedObject
- (NSTokenStyle)tokenField:(NSTokenField *)tokenField styleForRepresentedObject:(id)representedObject
- (BOOL)tokenField:(NSTokenField *)tokenField hasMenuForRepresentedObject:(id)representedObject
- (NSMenu *)tokenField:(NSTokenField *)tokenField menuForRepresentedObject:(id)representedObject
- (BOOL)tokenField:(NSTokenField *)tokenField writeRepresentedObjects:(NSArray *)objects toPasteboard:(NSPasteboard *)pboard
- (NSArray *)tokenField:(NSTokenField *)tokenField readFromPasteboard:(NSPasteboard *)pboard

NSArray *objects = [self.tokenField objectValue];
NSTextView *tv = [[self.tokenField cell] fieldEditorForView:self.tokenField];
NSArray *selections =[tv selectedRanges];

for (NSValue *rangeVal in selections) {
    NSRange range = [rangeVal rangeValue];
    for (NSUInteger i=0; i<range.length; i++) {
        NSLog(@"%@", [objects objectAtIndex:range.location + i]);
    }
}

public func textViewDidChangeSelection(notification: NSNotification) {

    if let fieldView = tokenField.cell!.fieldEditorForView(self) {

        var selectedObjects = [AnyObject]()

        for value in fieldView.selectedRanges {
            let range = value.rangeValue

            for var i = 0 ; i < range.length ; i++ {
                selectedObjects.append(tokenField.objectValue!.objectAtIndex(range.location + i))
            }
        }
        Swift.print("selected objects:(selectedObjects)")
    }
}