UISearchController使控制器变黑 [英] UISearchController makes the controller black

问题描述

我正在iOS 8中使用UISearchController，并在视图控制器的viewDidLoad中嵌入以下intializait中的

I am using UISearchController in iOS 8 with the following intializaiton in viewDidLoad of a view controller embedded in a tab controller

 _searchController = [[UISearchController alloc] initWithSearchResultsController:nil];

    _searchBar = _searchController.searchBar;
    [_searchController.searchBar sizeToFit];
    _searchController.searchBar.delegate = self;
   _searchController.searchResultsUpdater = self;
    _searchController.dimsBackgroundDuringPresentation = NO;
    _searchController.hidesNavigationBarDuringPresentation  = NO;
    self.definesPresentationContext = NO;
    _shopsTable.tableHeaderView = _searchController.searchBar;

我已实施

- （void）updateSearchResultsForSearchController：（UISearchController *）searchController 和（void）filterContentForSearchText：（NSString *）searchText

并且搜索工作，tableview正确更新等等。

and the search works, the tableview gets updated properly, etc.

但是！

如果我在搜索控制器处于活动状态时切换选项卡（只需点击搜索栏或某些文本）到另一个选项卡，然后返回搜索选项卡，我得到一个只有搜索栏的空白屏幕，如下所示

If I switch tabs while the searchcontroller is active (just tapping the search bar or with some text) to a different tab, and then go back to teh search tab, I get a blank screen with only the search bar, like this

在这种情况下，我搜索以 lar 开头的内容，返回结果并正确显示它们。但如果我切换标签，然后返回搜索标签，我会得到一个这样的空白屏幕。控制器返回其原始状态的唯一方法是，如果我执行 _searchController.active = NO 。但是如果用户希望保持该搜索处于活动状态，我就不能将其停用。

In this case, I search for things that start with lar, which did return results and displayed them correcly. But if I switch tabs, and return to the search tab I get a blank screen like this. The only way the controller returns to its original state is if I do _searchController.active = NO. But if the user wants to keep that search active, I can't just deactivate it.

我确信我遗漏了一些东西，但是因为没有太多的东西在UISeachController中，我无法弄清楚是什么导致这个...

I am sure I am missing something, but since there isn't much to do in UISeachController, I can't figure out what is causing this..

推荐答案

尝试self.definesPresentationContext = YES;而不是NO。这是我如何设置我的UISearchController，但我之前没有在UITabBarController中这样做。

Try self.definesPresentationContext = YES; instead of NO. Here is how I setup my UISearchController, but I haven't done it this way in a UITabBarController before.

func setupSearchController() {
    let resultsController = UIStoryboard(name: "ATPageTableViewController", bundle: nil).instantiateViewControllerWithIdentifier("ATPageTableSearchResultsViewController") as! ATPageTableSearchResultsViewController
    searchController = UISearchController(searchResultsController: resultsController)
    searchController.delegate = self
    resultsController.delegate = self
    resultsController.cellIdentifier = ATDataSetItemTableViewCellIdentifier;
    resultsController.table = self.table!
    searchController.searchBar.sizeToFit()
    self.tableView.tableHeaderView = searchController.searchBar
    searchController.searchResultsUpdater = self
    searchController.searchBar.delegate = self
    definesPresentationContext = true

}

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