CODEWITHSUNDEEP
iphoneiosxamarin.ios
Joshua Frank
Joshua Frank

Reputation: 13838

How can I tell when the user taps or drags a control without breaking the control?

Here's my situation: I've got a UISearchBar and a UITableView in a Navigation Controller. When the user taps in the search bar, the keyboard pops so the user can type a search string, as shown here:

enter image description here

But the keyboard obscures the list, and so I want to make it so that if the user taps the table, the keyboard goes away, and I'm having a surprising amount of difficulty.

  1. If I use a TapGestureRecognizer, I can tell if the user taps anywhere, but then when they tap on the table, the normal table events don't work.
  2. I tried something else (can't remember what now), and I got the event if the user taps the table, but not tap and drag, which is common, and so that's not quite enough.

What I want is something like a TouchDownInside event on the table itself, so I can dismiss the keyboard when the table gets user input of any kind, but this doesn't seem to exist. What's the best way to do this?

Upvotes: 0

Views: 85

Answers (2)

sergio
sergio

Reputation: 69027

If I use a TapGestureRecognizer, I can tell if the user taps anywhere, but then when they tap on the table, the normal table events don't work.

You could try and set cancelsTouchesInView to NO for your tap gesture recogniser:

tapGestureRecognizer.cancelsTouchesInView = NO;

This should allow the touches to be forwarded to the view even when the gesture is recognized.

You might also need to define a delegate for your gesture recognizer and the following method:

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer 
{
    return YES;
}

This is assuming that the table also manages its gestures through a gesture recognizer and thus to allow that both can work simultaneously.

Upvotes: 1

perrohunter
perrohunter

Reputation: 3526

An easy solution would be to catch when the UITableView is scrolling, as the UITableView extends the UIScrollView you can look for the scrollViewDidScroll: and make the search bar resign the first responder to make the keyboard go away, same can be done with scrollViewWillBeginDragging: method

- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
    [searchBar resignFirstResponder];
}

Implement this on you UITableViewDelegate as it behaves as the delegate of your UITableView

More information at

http://developer.apple.com/library/ios/documentation/uikit/reference/uiscrollviewdelegate_protocol/

Upvotes: 1

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