CODEWITHSUNDEEP
iosiphoneobjective-cipaduisearchbar
Markus
Markus

Reputation: 4038

iPhone: UISearchBar how to search for "" String?

I want to be able to search for a String without any character in it. The problem is, that the default keyboard does not show up the search button, when there is nothing written in the UISearchBar.

Any idea?

Thanks, Markus

Upvotes: 7

Views: 4777

Answers (6)

B.S.
B.S.

Reputation: 21726

Daniels answer works perfect till iOS 7.

iOS 7 Update

- (void)searchBarTextDidBeginEditing:(UISearchBar *) bar
{
    UITextField *searchBarTextField = nil;

    NSArray *views = ([[[UIDevice currentDevice] systemVersion] floatValue] < 7.0f) ? bar.subviews : [[bar.subviews objectAtIndex:0] subviews];

    for (UIView *subview in views)
    {
        if ([subview isKindOfClass:[UITextField class]])
        {
            searchBarTextField = (UITextField *)subview;
            break;
        }
    }
    searchBarTextField.enablesReturnKeyAutomatically = NO;
}

Upvotes: 7

henghonglee
henghonglee

Reputation: 1812

this is what i did

To remove keyboard upon backspace till blank:

-(void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText
{
    if ([searchText isEqualToString:@""]) {
        [searchBar resignFirstResponder];
    }
}

you will also need to set your uitextfield within your uisearchbar to the same delegate , remember to add to this delegate (in my code's context the delegate is self)

for (UIView *view in searchBar.subviews){
        if ([view isKindOfClass: [UITextField class]]) {
            UITextField *tf = (UITextField *)view;
            tf.delegate = self;
            break;
        }
    }

following that add these to your delegate

- (void)searchBarCancelButtonClicked:(UISearchBar *) aSearchBar {
    [aSearchBar resignFirstResponder];
}

-(BOOL)textFieldShouldClear:(UITextField *)textField
{
    [self performSelector:@selector(searchBarCancelButtonClicked:) withObject:textField.superview afterDelay: 0.1];
    return YES;
}

when any of these trigger , perform your search for "" string

Upvotes: 0

prem
prem

Reputation: 1

while searching a text. it is difficult to search a string without character... so you need to work on 

-(void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText
{
    //write code here
}

it will run automatically

Upvotes: 0

Jordan
Jordan

Reputation: 21760

Type * and use that as a placeholder in your program for "" (nothing).

Upvotes: 1

Daniel Dickison
Daniel Dickison

Reputation: 21882

Luckily, I just happened to be working on code that does exactly this. It's a bit of a hack, but you can find the UITextField that is embedded within the UISearchBar, then turn off enablesReturnKeyAutomatically:

UITextField *searchBarTextField = nil;
for (UIView *subview in searchBar.subviews)
{
    if ([subview isKindOfClass:[UITextField class]])
    {
        searchBarTextField = (UITextField *)subview;
        break;
    }
}
searchBarTextField.enablesReturnKeyAutomatically = NO;

Upvotes: 19

Sean
Sean

Reputation: 5403

Searching for "" is like searching for nil / NULL: the query will return all entries that are empty or null.

The * is a wildcard character used in most searching markups, and it'll return all matches.

Upvotes: 0

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