- (BOOL)canPerformAction:(SEL)action withSender:(id)sender
{
      if (action == @selector(paste:)) {
            return YES;
      }else{
      return [super canPerformAction:action withSender:sender];
}
}
- (BOOL)canBecomeFirstResponder
{
      return YES;
}
- (BOOL)becomeFirstResponder
{
      if ([super becomeFirstResponder]) {
            return YES;
      }
      return NO;
}
- (void)paste:(id)sender
{
      UIPasteboard *board = [UIPasteboard generalPasteboard];
      self.text = board.string;
      [self resignFirstResponder];
}