iphone UISearchBar完成按钮始终启用

Question

我有一个带UISearchBar的UIViewController。我已通过完成按钮替换了搜索按钮。

但是，当单击搜索栏时，最初会禁用“完成”按钮。这会发生，直到一个人输入任何字符

我想要做的是始终启用此完成按钮，这样如果我点击它我可以立即关闭键盘。

有帮助吗？非常感谢。

我有我的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  
}  

Answer 1

将enableReturnKey自动设置为false

enablesReturnKeyAutomatically

searchBar.enablesReturnKeyAutomatically = false

Answer 2

接受的答案似乎不再起作用了，所以我制作了自己的类别似乎确实有效：

@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
            }
        }
    }
}

Answer 3

对于iOS 8及更高版本，您可以使用

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

Answer 4

请写下面的代码可能对你有所帮助:)

如果您有空字符串，此代码显示搜索按钮。

- (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;
}

Answer 5

在XCode 8.3.3上为iOS 10提供简单易用的解决方案，虽然花了一些时间来弄明白:)

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

将搜索更改为完成。无需在搜索字段中键入任何内容即可启用“完成”。之后 - > searchBar.resignFirstResponder（）如下：

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

Answer 6

例如，基于地图应用程序，模式似乎应该是在文本字段附近有一个取消按钮以摆脱键盘。话虽如此，一个建议可能是将一个自定义UIButton放置在该角落，看起来就像完成按钮。

一种hacky解决方案......

希望这可以帮助！

Answer 7

开始编辑搜索时，最简单的方法和技巧就是空白

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

Answer 8

Swift的扩展：

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
    }
}

用法：

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