On the UISearchBar, there's an X element that allows you to clear all of the contents at once. Is there a way to get notified when this happens?
UISearchBarDelegate::searchBarCancelButtonClicked
is fired only when the "Cancel" button is tapped.
The UISearchBar
doesn't have a delegate method for this event. You can nearly get what you want by implementing the textDidChange:
method of the callback delegate and checking for an empty string.
I don't recommend it, but there is another possible way. The UISearchBar
is composed of a UITextField, which does have a delegate method that is called when the user taps the clear button (textFieldShouldClear:
). You can get the UITextField
by traversing the UISearchBar
's child views:
(this is in the context of a derived UISearchBar
class)
- (UIView*) textField
{
for (UIView* v in self.subviews)
{
if ( [v isKindOfClass: [UITextField class]] )
return v;
}
return nil;
}
from here, you could re-assign the UITextField
delegate to your own implementation, taking care to forward delegate calls to the old delegate. This way you could intercept textFieldShouldClear:
. Or if it turns out the UISearchBar
is the delegate for the UITextField
it contains you could swizzle the call to textFieldShouldClear:... Not ideal, clearly, but technically feasible.