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加载视图时不会显示搜索栏-iOS

uisearchcontroller swift

J Derbs · 技术社区 · 6 年前

当我点击它时会显示:

我正试图让它在视图启动时显示,它当前只在我开始滚动时显示:

    searchController.searchBar.scopeButtonTitles = ["Posts", "Users"]
        searchController.searchBar.delegate = self
        navigationController?.navigationItem.searchController = searchController
        navigationController?.navigationItem.searchController?.searchBar.isHidden = false
        searchController.searchResultsUpdater = self
        searchController.obscuresBackgroundDuringPresentation = false
        searchController.searchBar.placeholder = "Search"
        searchController.searchBar.isHidden = false
        searchController.searchBar.showsScopeBar = true
//        searchController.hidesNavigationBarDuringPresentation = false
        self.navigationController?.setNavigationBarHidden(false, animated: true)

        navigationItem.searchController = searchController
//        navigationController?.navigationItem.hidesSearchBarWhenScrolling = false
        definesPresentationContext = true

我试过很多不同的方法让搜索栏在点击时出现,但我没有成功。有什么想法吗?

1 回复 | 直到 6 年前

Jakub Sanestrzik 6 年前

navigationItem.hidesSearchBarWhenScrolling = false

如果您不想从一开始就显示if并在滚动时隐藏它,那么您需要这样做:

override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)
    if #available(iOS 11.0, *) {
        navigationItem.hidesSearchBarWhenScrolling = false
    }
}

override func viewDidAppear(_ animated: Bool) {
    super.viewDidAppear(animated)
    if #available(iOS 11.0, *) {
        navigationItem.hidesSearchBarWhenScrolling = true
    }
}

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