How to enable cancel button with UISearchBar?
In the contacts app on the iPhone if you enter a search term, then tap the "Search" button, the keyboard is hidden, BUT the cancel button is still enabled. In my app the cancel button gets disabled when I call resignFirstResponder.
Anyone know how to hide the keyboard while maintaining the cancel button in an enabled state?
I use the following code:
- (void)searchBarSearchButtonClicked:(UISearchBar *)searchBar
{
[searchBar resignFirstResponder];
}
The keyboard slides out of view, but the "Cancel" button to the right of the search text field is disabled, so that I cannot cancel the search. The contacts app maintains the cancel button in an enabled state.
I think maybe one solution is to dive into the searchBar object and call resignFirstResponder on the actual text field, rather than the search bar itself.
Any input appreciated.
尝试这个
for(id subview in [yourSearchBar subviews])
{
if ([subview isKindOfClass:[UIButton class]]) {
[subview setEnabled:YES];
}
}
This method worked in iOS7.
- (void)enableCancelButton:(UISearchBar *)searchBar
{
for (UIView *view in searchBar.subviews)
{
for (id subview in view.subviews)
{
if ( [subview isKindOfClass:[UIButton class]] )
{
[subview setEnabled:YES];
NSLog(@"enableCancelButton");
return;
}
}
}
}
(Also be sure to call it anywhere after [_searchBar resignFirstResponder] is used.)
The accepted solution will not work when you start scrolling the table instead of tapping the "Search" button. In that case the "Cancel" button will be disabled.
This is my solution that re-enables the "Cancel" button every time it is disabled by using KVO.
- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
// Search for Cancel button in searchbar, enable it and add key-value observer.
for (id subview in [self.searchBar subviews]) {
if ([subview isKindOfClass:[UIButton class]]) {
[subview setEnabled:YES];
[subview addObserver:self forKeyPath:@"enabled" options:NSKeyValueObservingOptionNew context:nil];
}
}
}
- (void)viewWillDisappear:(BOOL)animated
{
[super viewWillDisappear:animated];
// Remove observer for the Cancel button in searchBar.
for (id subview in [self.searchBar subviews]) {
if ([subview isKindOfClass:[UIButton class]])
[subview removeObserver:self forKeyPath:@"enabled"];
}
}
- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context
{
// Re-enable the Cancel button in searchBar.
if ([object isKindOfClass:[UIButton class]] && [keyPath isEqualToString:@"enabled"]) {
UIButton *button = object;
if (!button.enabled)
button.enabled = YES;
}
}
上一篇: 如何解雇键盘？