Double-tap the UINavigationController navigationBar?

Question

I have an application with a long list of data in the View table, and I would like to double-tap the navigation bar to scroll through the UITableView at the top of the list (where the search is being performed).

How to implement this?

Thank you for your help.

Answer 1

The standard gesture for scrolling through the View table at the top is a single click on the status bar. It is enabled by default, see UIScrollView Help

If you really need a navigation bar, and you focus on 3.2 and higher, I would recommend connecting the UITapGestureRecognizer to the navigationBar.

- (void)viewDidLoad {
    UITapGestureRecognizer* tapRecon = [[UITapGestureRecognizer alloc]
              initWithTarget:self action:@selector(navigationBarDoubleTap:)];
    tapRecon.numberOfTapsRequired = 2;
    [navController.navigationBar addGestureRecognizer:tapRecon];
    [tapRecon release];
}

- (void)navigationBarDoubleTap:(UIGestureRecognizer*)recognizer {
    [tableView setContentOffset:CGPointMake(0,0) animated:YES];
}

3.0 , .

Answer 2

, , .

:

0 leftbutton, 1 , 2,

:

[navController.navigationBar addGestureRecognizer:tapRecon];

:

[[self.navigationController.navigationBar.subviews objectAtIndex:1] setUserInteractionEnabled:YES];
[[self.navigationController.navigationBar.subviews objectAtIndex:1] addGestureRecognizer:tapRecon];