iOS UITableView检测表下方的触摸-是否需要子类化？

//In viewDidLoad 
//configure footerView with gesture recognizer
UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc]
                                            initWithTarget:self action:@selector(handleSingleTapOnFooter:)];
singleTap.numberOfTapsRequired = 1;
[self.footerView addGestureRecognizer:singleTap];
[singleTap release];
self.tableView.tableFooterView = self.footerView;

//Later on, implement the corresponding method
- (IBAction) handleSingleTapOnFooter: (UIGestureRecognizer *) sender {
    NSLog(@\"The footer was tapped!\");
    // code to add an entry to the table here
}

UINavigationBar

tableHeaderView

TableView

UIBarButtonItem *newButton = [[UIBarButtonItem alloc] initWithTitle:@\"NEW\" style:UIBarButtonItemStyleDone target:self action:@selector(newEntry)];
UINavigationItem *navi = [[UINavigationItem alloc] init];
navi.title = @\"my table title\";
[navi setRightBarButtonItem:newButton];
UINavigationBar *bar = [[UINavigationBar alloc] initWithFrame:CGRectMake(0, 0, widthOfMyTableview, heightOfRow)];
[bar setItems:[NSArray arrayWithObject:navi]];

...

myTableView.tableHeaderView = bar;
[newButton release];
[navi release];
[bar release];