UISearchController searchBar 在第一次点击时消失 [英] UISearchController searchBar disappears on first click

问题描述

我在 TableView 中实现了一个 UISearchController，由导航控制器推送.

I have implemented a UISearchController in a TableView, pushed by a Navigation Controller.

首先我的问题是，每当我点击 SearchBar 时，它就会消失.当我输入一些文本时它起作用，但它保持完全空白.然后我设法使用此代码半解决了这个问题:

First my problem was that whenever I click on the SearchBar, it disappears. It works when I enter some text, but it stays completely blank. Then I managed to semi solve the issue using this code:

- (void)searchForText:(NSString*)searchText
{
    [self.view addSubview:villeSearchController.searchBar];
}

这是半工程，因为现在，当我点击搜索栏时，它会变黑，但如果我输入一个字符，它会再次出现，然后它会一直留在那里，无论如何.直到我取消搜索，然后再次单击它，在这种情况下它才会消失.我已经做了一些测试，并且在第一次点击时调用了这个方法 (searchForText)，所以这不是原因.

Which semi-works because now, when I click on the search bar, it blanks out, but if I enter one character, it appears again, and then it stays there, no matter what. Until I cancel the search, and click on it again, in that case it blanks out. I have made some tests and this method (searchForText) is called on the very first click, so that isn't the reason.

有谁知道我如何解决这个问题并使搜索栏在第一次点击时出现?

Does anyone know how I can solve this issue and make the searchbar appear from the very first click?

这是我初始化 SearchController 的方式:

This is how I initialize the SearchController:

villeSearchController = [[UISearchController alloc]   initWithSearchResultsController:nil];
villeSearchController.searchResultsUpdater = self;
villeSearchController.dimsBackgroundDuringPresentation = NO;
villeSearchController.searchBar.delegate = self;
villeTableView.tableHeaderView = villeSearchController.searchBar;
villeSearchController.searchBar.scopeButtonTitles = @[];
self.definesPresentationContext = YES;
[villeSearchController.searchBar sizeToFit];

推荐答案

尝试检查 navigationBar.translucent 属性 - 当 UISearchController 将呈现searchBar 否则将是 UI 错误.

Try to check the navigationBar.translucent property - it should be YES when UISearchController will present the searchBar or else will be UI bugs.

来自@SiavA 的更新

更好的解决方案是使用 UIViewController 的 extendedLayoutIncludesOpaqueBars 属性.如果您使用不透明的导航栏，只需将其设置为控制器的 true 将显示 UISearchController(不适用于 navigationController).

The better solution is use the extendedLayoutIncludesOpaqueBars property of the UIViewController. If you using the opaque navigation bar just set it in the true for controller which will be show UISearchController (not for navigationController).

例如

- (void)viewDidLoad {
    [super viewDidLoad];

    self.extendedLayoutIncludesOpaqueBars = !self.navigationController.navigationBar.translucent;
}

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