Copying NSDictionary to NSArray

I have a variable declared as NSDictionary. How can I copy it to an extern const NSArray variable? For example:

NSMutableDictionary *selectedItem = [self.dataArray objectAtIndex:indexPath.row];
[selectedItem setObject:[NSNum开发者_高级运维ber numberWithBool:targetCustomCell.checked]     
                 forKey:@"checked"];

allKeys returns an NSArray containing all the keys. allValues returns an NSArray containing all the values.

NSArray *keys = [myDict allKeys];
NSArray *values = [myDict allValues];