Hide UISearchBar Cancel Button

问题

I have a UISearchDisplayController and UISearchBar hooked up to my ViewController via Outlets from my nib.

I'd like to hide the cancel button so that the user never sees it. The problem is that the following code hides the button, but only after displaying it to the user for a millisecond (e.g., it flashes on the simulator and device and then disappears out of view).

- (void)searchDisplayControllerDidBeginSearch:(UISearchDisplayController *)controller 
{
    controller.searchBar.showsCancelButton = NO;
}

Is there a better way to hide it?

回答1:

I managed to hide the "Cancel" button by subclassing UISearchBar and override this method:

-(void)layoutSubviews{
    [super layoutSubviews];
    [self setShowsCancelButton:NO animated:NO];
}

回答2:

I had the same issue, but fixed it a different way.

For those who can't or don't want to subclass UISearchDisplayController, I fixed the issue by adding a listener on UIKeyboardWillShowNotification, and setting [self setShowsCancelButton:NO animated:NO] there.

In viewWillAppear::

// Add keyboard observer:
[[NSNotificationCenter defaultCenter] addObserver:self
                                         selector:@selector(keyboardWillAppear:)
                                             name:UIKeyboardWillShowNotification
                                           object:nil];

Then you create:

- (void)keyboardWillAppear:(NSNotification *)notification
{
    [YOUR-SEARCHBAR-HERE setShowsCancelButton:NO animated:NO];
}

Don't forget to add,

[[NSNotificationCenter defaultCenter] removeObserver:self];

in viewWillDisappear:!

Hope this helps!

回答3:

Similar to Nimrod's answer, you can also subclass UISearchDisplayController and implement the setActive:animated: method:

- (void)setActive:(BOOL)visible animated:(BOOL)animated {
    [super setActive:visible animated:animated];
    self.searchBar.showsCancelButton = NO;
}

回答4:

This seems to be a bug within Xcode. I submitted this error to Apple's bug reporting site, and they've followed up asking for more sample code and use-cases.

Thanks everyone for your attempt at solving this problem.

回答5:

class CustomSearchBar: UISearchBar {

    override func setShowsCancelButton(showsCancelButton: Bool, animated: Bool) {
        super.setShowsCancelButton(false, animated: false)
    }

}

class CustomSearchController: UISearchController, UISearchBarDelegate {

    lazy var _searchBar: CustomSearchBar = {
        [unowned self] in
        let customSearchBar = CustomSearchBar(frame: CGRectZero)
        customSearchBar.delegate = self
        return customSearchBar
    }()

    override var searchBar: UISearchBar {
        get {
            return _searchBar
        }
    }

}

回答6:

Had this problem when using the UISearchBar with UISearchController. I'm using my own cancel button, as the cancel button wasn't showing on iPad with showsCancelButton = YES, now it won't hide on iPhone with showsCancelButton = NO!

The following worked for me.

Set the delegate, and initial value:

- (void)viewDidLoad
{
    // ... 
    self.searchController.searchBar.showsCancelButton = NO;
    self.searchController.searchBar.delegate = self;
}

Reset showsCancelButton to NO 0.1s after the text bar begins editing.

#pragma mark - UISearchBarDelegate
- (void)searchBarTextDidBeginEditing:(UISearchBar *)searchBar
{
    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, 0.1 * NSEC_PER_SEC), dispatch_get_main_queue(), ^{
        self.searchController.searchBar.showsCancelButton = NO;
    });
}

回答7:

If you want to avoid the subclassing, implement

searchController.searchBar.showsCancelButton = false;

in these two delegate methods (Do not forget to assign delegates):

- (void)updateSearchResultsForSearchController:(UISearchController *)searchController

- (void)didPresentSearchController:(UISearchController *)searchController

The first one is called everytime you update the searchBar (Cancel button is visible by default) and the second one is for the first searchBar activation.

回答8:

Just based on issues I've had before have you tried setting it in:

- (void)searchDisplayControllerWillBeginSearch:(UISearchDisplayController *)controller

I don't know how to ask this question in your question sorry if this is out of place.

回答9:

If the cancel button shows up when editing the search field of the search bar you could do the following; subclass the search bar and have it implement the UITextFieldDelegateprotocol:

@interface CustomAlignedSearchBar : UISearchBar<UITextFieldDelegate>

Then implement textFieldDidBeginEditing: and do something like:

- (void)textFieldDidBeginEditing:(UITextField *)textField{
    [self setShowsCancelButton:self.cancelButtonShown animated:NO];
}

This will make sure that the cancel button will not show up.

回答10:

After UISearchDisplayController deprecated in iOS8, Apple give handle search presentation to UISearchControllerDelegate.

so you can override searchBar to hide the Cancel button, like below :

- (void)didPresentSearchController:(UISearchController *)searchController {
    [searchController.searchBar setShowsCancelButton:NO];
}

if you need hidden Cancel button from inactive state, you need set searchBar on init :

search = [[UISearchController alloc] initWithSearchResultsController:nil];
[search.searchBar setShowsCancelButton:NO];

来源：https://stackoverflow.com/questions/8496310/hide-uisearchbar-cancel-button

标签

objective-c

ios

cocoa-touch

uisearchbar

uisearchdisplaycontroller