显示带有操作的搜索栏（栏项）

Question

我的搜索栏有问题。我需要在右上角创建一个带有搜索按钮的 table 视图，当我点击它时，它应该会显示搜索栏。

我的代码在这里：

// Search controller
searchController = ({
    let controller = UISearchController(searchResultsController: nil)
    controller.delegate = self
    controller.searchBar.delegate = self
    controller.searchResultsUpdater = self
    controller.dimsBackgroundDuringPresentation = false         
    controller.hidesNavigationBarDuringPresentation = true
    controller.searchBar.sizeToFit()
    return controller
})()

这是行动：

// Search action
@IBAction func search(sender: UIBarButtonItem) {
    print("Open search")
    searchController.active = true
    if searchController.searchBar.isFirstResponder() == false {
        searchController.searchBar.becomeFirstResponder()
    }
}

当我点击按钮时，没有任何反应（只在控制台打印文本），我想要的是下图：

Answer 1

您的 class 需要符合 UISearchBarDelegate，我不确定您是否已经这样做了。还要确保您呈现搜索视图

来自 Apple 的文档：

The UISearchBarDelegate protocol defines the optional methods you implement to make a UISearchBar control functional. A UISearchBar object provides the user interface for a search field on a bar, but it’s the application’s responsibility to implement the actions when buttons are tapped. At a minimum, the delegate needs to perform the actual search when text is entered in the text field.

这是我的应用中的示例

@IBAction func searchAction(sender: UIBarButtonItem) {
    // Create the search controller and specify that it should present its results in this same view        
    searchController = UISearchController(searchResultsController: nil) 

    // Set any properties (in this case, don't hide the nav bar and don't show the emoji keyboard option)
    searchController.hidesNavigationBarDuringPresentation = false
    searchController.searchBar.keyboardType = UIKeyboardType.ASCIICapable

    // Make this class the delegate and present the search
    self.searchController.searchBar.delegate = self
    presentViewController(searchController, animated: true, completion: nil)
}

Answer 2

老问题，但想添加一个新答案（也许自 2016 年的原始答案以来情况发生了变化）。

假设您已经设置了搜索控制器，只需在视图控制器上调用它。无需符合 UISearchBarDelegate:

Swift 5

present(searchController, animated: true, completion: nil)

显示带有操作的搜索栏（栏项）

Show search bar with action (bar item)

action

uisearchbar

ios

swift