ios - 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表格 View ，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

您的类(class)需要符合 UISearchBarDelegate ，我不确定你是否已经这样做了。还要确保呈现搜索 View

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)
}