iphone UISearchBar Done button always enabled

问题:

I have a UIViewController with a UISearchBar. I have replaced the Search Button by a Done button.

However, when one taps on the searchbar, the Done button is initially disabled. This occurs until one enters any character.

What I want to do is to have this Done button always enabled, such that if i tap on it i can inmediately dismiss the keyboard.

Any help? it would be highly appreciated.

I have on my UIViewController

-(BOOL)searchBarShouldBeginEditing:(UISearchBar *)searchBar  
{   
    return YES;  
}  

-(void)searchBarSearchButtonClicked:(UISearchBar *)searchBar
{
    [searchBar resignFirstResponder];
}  

-(void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText  
{  
    if (searchBar.text.length == 0)  
    {  
        //[self fixOrientation];  
        [searchBar resignFirstResponder];  
    }   
    else  
    {  
        NSLog(@"typed");  
    }  
}  


-(void)searchBarTextDidBeginEditing:(UISearchBar *)theSearchBar  
{  
    NSLog(@"began");  // this executes as soon as i tap on the searchbar, so I'm guessing this is the place to put whatever solution is available  
}  

回答1:

Nowadays UISearchBar conforms to UITextInputTraits. You can simply set:

searchBar.enablesReturnKeyAutomatically = NO;

WARNING: While this compiles for iOS 7.0, it will crash at runtime. It only works for >=7.1.

The docs are not clear on this one, as only since 7.1, the UISearchBar implements the UITextInputTraits protocol, but it is not noted since which iOS version the protocol is adopted.

回答2:

You can get around this by looping around the subviews in the UISearchBar until you find the text field. Its then just a matter of setting "enablesReturnKeyAutomatically" to NO. Incidentally the following code also is useful for setting the keyboard type.

  // loop around subviews of UISearchBar
  for (UIView *searchBarSubview in [searchBar subviews]) {    
    if ([searchBarSubview conformsToProtocol:@protocol(UITextInputTraits)]) {    
      @try {
        // set style of keyboard
        [(UITextField *)searchBarSubview setKeyboardAppearance:UIKeyboardAppearanceAlert];

        // always force return key to be enabled
        [(UITextField *)searchBarSubview setEnablesReturnKeyAutomatically:NO];
      }
      @catch (NSException * e) {        
        // ignore exception
      }
    }
  }

回答3:

The accepted answer doesn't seem to work anymore, so I made my own category that does seem to work:

@implementation UISearchBar (enabler)

- (void) alwaysEnableSearch {
    // loop around subviews of UISearchBar
    NSMutableSet *viewsToCheck = [NSMutableSet setWithArray:[self subviews]];
    while ([viewsToCheck count] > 0) {
        UIView *searchBarSubview = [viewsToCheck anyObject];
        [viewsToCheck addObjectsFromArray:searchBarSubview.subviews];
        [viewsToCheck removeObject:searchBarSubview];
        if ([searchBarSubview conformsToProtocol:@protocol(UITextInputTraits)]) {
            @try {
                // always force return key to be enabled
                [(UITextField *)searchBarSubview setEnablesReturnKeyAutomatically:NO];
            }
            @catch (NSException * e) {
                // ignore exception
            }
        }
    }
}

回答4:

For iOS 8 and above you can use

[self.searchBar setReturnKeyType:UIReturnKeyDone];
[self.searchBar setEnablesReturnKeyAutomatically:NO];

回答5:

Please write following code may be helpful for you :)

This code display Search Button if you have empty string .

- (BOOL)searchBarShouldBeginEditing:(UISearchBar *)searchBar
{
    [itemSearchBar setShowsCancelButton:YES];
    UITextField *searchBarTextField = nil;
    for (UIView *subView in self.itemSearchBar.subviews)
    {
        for (UIView *sndSubView in subView.subviews)
        {
            if ([sndSubView isKindOfClass:[UITextField class]])
            {
                searchBarTextField = (UITextField *)sndSubView;
                break;
            }
        }
    }
    searchBarTextField.enablesReturnKeyAutomatically = NO;
    return YES;
}

回答6:

Simple and easy solution for iOS 10 on XCode 8.3.3, although it took some time to figure it out :)

@IBOutlet var searchBar: UISearchBar! {
    didSet {
        searchBar.returnKeyType = .done
        searchBar.enablesReturnKeyAutomatically = false
    }
}

Changes Search to Done. Enables Done without having to type anything in the search field. After that -> searchBar.resignFirstResponder() like so:

func searchBarSearchButtonClicked(_ searchBar: UISearchBar) {
    searchBar.resignFirstResponder()
}

回答7:

Based on the Maps app, for example, it seems the pattern should be to have a cancel button near the textfield to get rid of the keyboard. With that said, one suggestion might be to have a custom UIButton placed right in that corner that looks just like the Done button.

Kind of a hacky solution...

Hope this helps!

回答8:

A simplest way and tricky is just put a blank when beginning editing search

-(void)searchBarTextDidBeginEditing:(UISearchBar *)searchBar{
    //Add a blank character to hack search button enable
    searchBar.text = @" ";}

回答9:

Extension for Swift:

extension UISearchBar {
    var textField: UITextField? {
        return getTextField(inViews: subviews)
    }

    private func getTextField(inViews views: [UIView]?) -> UITextField? {
        guard let views = views else { return nil }

        for view in views {
            if let textField = (view as? UITextField) ?? getTextField(inViews: view.subviews) {
                return textField
            }
        }

        return nil
    }
}

Usage:

searchBar.textField?.returnKeyType = .Done
searchBar.textField?.enablesReturnKeyAutomatically = false

回答10:

Set enablesReturnKeyAutomatically to false

enablesReturnKeyAutomatically

searchBar.enablesReturnKeyAutomatically = false