SearchBar从iOS 7中的标题视图中消失

Question

我有一个tableview在我的应用程序中显示设备列表.当调用viewWillAppear时,我添加了self.searchDisplayController.searchBar as a subview to a headerView.然后我分配self.tableView.tableHeaderView = headerView.它看起来像这样:

我向下滚动tableview,以便headerview不在视图中,然后通过点击单元格转到其他视图控制器.当我回到这个tableView时,向上滚动到headerView,searchBar变得不可见,但是在点击不可见区域时,searchDisplayController被激活并且取消按钮不起作用.这仅适用于iOS 7.为什么会这样？
注意:当我回到tableViewController时,只有当headerView不在视图中时才会发生.

Answer 1

我刚才有同样的问题.当我在最终搜索状态下调试UISearchDisplayController的委托方法时,searchBar成为UIView的子视图,而不是UITableView.请看下面的代码:

- (void)searchDisplayControllerDidEndSearch:(UISearchDisplayController *)controller
{
    //My Solution: remove the searchBar away from current super view,
    //then add it as subview again to the tableView
    UISearchBar *searchBar = controller.searchBar;
    UIView *superView = searchBar.superview;
    if (![superView isKindOfClass:[UITableView class]]) {
        NSLog(@"Error here");
        [searchBar removeFromSuperview];
        [self.tableView addSubview:searchBar];
    }
    NSLog(@"%@", NSStringFromClass([superView class]));
}

我的解决方案是将searchBar从当前的超级视图中移除,然后再次将其作为子视图添加到tableView.我已经成功测试了.希望有所帮助!

问候

Answer 2

我有完全一样的问题.搜索栏仍然存在,可以接收触摸事件.然而,它没有呈现.我相信问题出在UISearchDisplaycontroller中,因为如果我不使用UISearchDisplayController它会呈现正常.我最终编写了一个自定义的SearchDisplaycontroller来替换它.这是非常基本的,只做我需要的.

使用它与普通的UISearchDisplayController一样,但self.searchDisplayController不会返回任何内容.您将不得不使用另一个指针来引用自定义搜索显示控制器.

看起来像一个大丑陋的工作,但唯一一个适合我的工作.渴望听到其他选择.

@protocol SearchDisplayDelegate;

@interface SearchDisplayController : NSObject<UISearchBarDelegate>

- (id)initWithSearchBar:(UISearchBar *)searchBar contentsController:(UIViewController *)viewController;

@property(nonatomic,assign)                           id<SearchDisplayDelegate> delegate;

@property(nonatomic,getter=isActive)  BOOL            active;  // configure the view controller for searching. default is NO. animated is NO
- (void)setActive:(BOOL)visible animated:(BOOL)animated;       // animate the view controller for searching

@property(nonatomic,readonly)                         UISearchBar                *searchBar;
@property(nonatomic,readonly)                         UIViewController           *searchContentsController; // the view we are searching (often a UITableViewController)
@property(nonatomic,readonly)                         UITableView                *searchResultsTableView;   // will return non-nil. create if requested
@property(nonatomic,assign)                           id<UITableViewDataSource>   searchResultsDataSource;  // default is nil. delegate can provide
@property(nonatomic,assign)                           id<UITableViewDelegate>     searchResultsDelegate;

@end


@protocol SearchDisplayDelegate <NSObject>
// implement the protocols you need
@optional
@end

实施

@implementation SearchDisplayController {
    UISearchBar *_searchBar;
    UIViewController *_viewController;
    UITableView *_searchResultsTableView;
    UIView *_overLay;
}

- (void)dealloc {
    [_searchBar release];
    [_searchResultsTableView release];
    [_overLay release];
    [super dealloc];
}

- (UIViewController *)searchContentsController {
    return _viewController;
}

- (UITableView *)searchResultsTableView {
    return _searchResultsTableView;
}

- (id)initWithSearchBar:(UISearchBar *)searchBar contentsController:(UIViewController *)viewController {
    self = [super init];
    if (self) {
        _searchBar = [searchBar retain];
        _searchBar.delegate = self;
        _viewController = viewController;
        _searchResultsTableView = [[UITableView alloc]initWithFrame:CGRectMake(0, CGRectGetMaxY(_searchBar.frame), _viewController.view.frame.size.width, _viewController.view.frame.size.height - CGRectGetMaxY(_searchBar.frame))];
        _overLay = [[UIView alloc]initWithFrame:_searchResultsTableView.frame];
        _overLay.backgroundColor = [UIColor colorWithWhite:0 alpha:0.5];
        UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(overLayTapped)];
        [_overLay addGestureRecognizer:tap];
        [tap release];
    }
    return self;
}
- (void)setSearchResultsDataSource:(id<UITableViewDataSource>)searchResultsDataSource {
    _searchResultsTableView.dataSource = searchResultsDataSource;
}

- (void)setSearchResultsDelegate:(id<UITableViewDelegate>)searchResultsDelegate {
    _searchResultsTableView.delegate = searchResultsDelegate;
}

- (void)overLayTapped {
    [self setActive:NO animated:YES];
    [_searchBar resignFirstResponder];
    _searchBar.text = nil;
    _searchBar.showsCancelButton = NO;
}

- (void)setActive:(BOOL)visible animated:(BOOL)animated {
    UIView *viewToAdd = nil;
    if (!_searchBar.text.length) {
        viewToAdd = _overLay;
    } else {
        viewToAdd = _searchResultsTableView;
    }
    float a = 0;
    if (visible) {
        [_viewController.view addSubview:viewToAdd];
        a = 1.0;
    }
    if ([_viewController.view respondsToSelector:@selectore(scrollEnabled)]) {
        ((UIScrollView *)_viewController.view).scrollEnabled = !visible;
    }

    if (animated) {
        [UIView animateWithDuration:0.2 animations:^{
            _overLay.alpha = a;
            _searchResultsTableView.alpha = a;
        }];
    } else {
        _overLay.alpha = a;
        _searchResultsTableView.alpha = a;
    }
}

- (void)setActive:(BOOL)active {
    [self setActive:active animated:YES];
}

#pragma mark - UISearchBar delegate protocols

- (void)searchBarTextDidBeginEditing:(UISearchBar *)searchBar {
    [self setActive:YES animated:YES];
    searchBar.showsCancelButton = YES;
    [_searchResultsTableView reloadData];
}

- (void)searchBarTextDidEndEditing:(UISearchBar *)searchBar {

}

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

- (void)searchBarCancelButtonClicked:(UISearchBar *)searchBar {
    [self overLayTapped];
}

- (void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText {
    if (searchText.length) {
        [_overLay removeFromSuperview];
        [_viewController.view addSubview:_searchResultsTableView];
    } else {
        [_searchResultsTableView removeFromSuperview];
        [_viewController.view addSubview:_overLay];
    }
        [_searchResultsTableView reloadData];
}

@end

更新:关于如何使用此程序

宣布伊娃

SearchDisplayController *mySearchDisplayController;

以编程方式初始化它

mySearchDisplayController = [[SearchDisplayController alloc]initWithSearchBar:mySearchBar contentsController:self];

将搜索栏添加到您的tableview

self.tableView.headerView = mySearchBar;

使用mySearchDisplayController作为对custon类的引用,而不是self.searchDisplayController.