ios - 如何在滚动条上隐藏搜索栏？ (没有 UITableViewController)

Question

我有一个包含 UITableView 的简单 UIViewController，我想在滚动 UITableView 时隐藏导航栏内的搜索栏。我找到了

navigationItem.hidesSearchBarWhenScrolling = true

但它不起作用。有什么方法可以让它在 UIViewController 上工作吗？

Answer 1

SWIFT 4 simple implementation

将 UISearchBarDelegate 委托(delegate)添加到您的类中

然后在你的类中添加这个函数

func showSearchBar() {
    let searchController = UISearchController(searchResultsController: nil)
    searchController.searchBar.delegate = self
    searchController.dimsBackgroundDuringPresentation = false
    searchController.hidesNavigationBarDuringPresentation = true
    navigationItem.hidesSearchBarWhenScrolling = true 
    //true for hiding, false for keep showing while scrolling
    searchController.searchBar.sizeToFit()
    searchController.searchBar.returnKeyType = UIReturnKeyType.search
    searchController.searchBar.placeholder = "Search here"
    navigationItem.searchController = searchController
}

然后调用viewDidLoad()中的函数