使用UISearchController自定义UISearchBar [英] Custom UISearchBar with UISearchController

问题描述

UISearchController 的文档说你可以覆盖 - searchBar 来提供<$ c $的自定义子类c> UISearchBar 供控制器使用。确实使用了自定义搜索栏，并且正确调用了自己的委托方法，但搜索栏更改时不再调用 UISearchResultsUpdating 方法。我是否需要手动进行大量的布线工作，或者是否有一些我缺少的东西让控制器的行为与本机提供的搜索栏一样？

The documentation for UISearchController says that you can override - searchBar to provide a custom subclass of UISearchBar for the controller to use. The custom search bar does get used, and its own delegate methods are called correctly, but the UISearchResultsUpdating method no longer gets called when the search bar changes. Do I need to do a lot of wiring things up manually, or is there something I'm missing to get the controller to behave like it does with a natively supplied search bar?

推荐答案

覆盖自定义UISearchController类中的SearchBar getter，它必须返回你的自定义SearchBar并且必须已经初始化，然后你只能在UISearchController init之后设置它的属性，这样保留所有UISearchController功能：

Override the SearchBar getter in your custom UISearchController class, it have to return your custom SearchBar and it have to be already initialized, then you setup its properties only after the UISearchController init, this way all the UISearchController functionality are retained:

public class DSearchController: UISearchController {

    private var customSearchBar = DSearchBar()
    override public var searchBar: UISearchBar {
        get {
            return customSearchBar
        }
    }

    required public init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
    }
    override init(nibName nibNameOrNil: String?, bundle nibBundleOrNil: NSBundle?) {
        super.init(nibName: nibNameOrNil, bundle: nibBundleOrNil)
    }
    public init(searchResultsController: UIViewController?,
                searchResultsUpdater: UISearchResultsUpdating?,
                delegate: UISearchControllerDelegate?,
                dimsBackgroundDuringPresentation: Bool,
                hidesNavigationBarDuringPresentation: Bool,
                searchBarDelegate: UISearchBarDelegate?,
                searchBarFrame: CGRect?,
                searchBarStyle: UISearchBarStyle,
                searchBarPlaceHolder: String,
                searchBarFont: UIFont?,
                searchBarTextColor: UIColor?,
                searchBarBarTintColor: UIColor?, // Bar background
                searchBarTintColor: UIColor) { // Cursor and bottom line

        super.init(searchResultsController: searchResultsController)

        self.searchResultsUpdater = searchResultsUpdater
        self.delegate = delegate
        self.dimsBackgroundDuringPresentation = dimsBackgroundDuringPresentation
        self.hidesNavigationBarDuringPresentation = hidesNavigationBarDuringPresentation        

        customSearchBar.setUp(searchBarDelegate,
                              frame: searchBarFrame,
                              barStyle: searchBarStyle,
                              placeholder: searchBarPlaceHolder,
                              font: searchBarFont,
                              textColor: searchBarTextColor,
                              barTintColor: searchBarBarTintColor,
                              tintColor: searchBarTintColor)

    }
}

这是我自定义的searchBar：

And this is my custom searchBar:

public class DSearchBar: UISearchBar {

    var preferredFont: UIFont?
    var preferredTextColor: UIColor?

    init(){
        super.init(frame: CGRect.zero)
    }

    func setUp(delegate: UISearchBarDelegate?,
               frame: CGRect?,
               barStyle: UISearchBarStyle,
               placeholder: String,
               font: UIFont?,
               textColor: UIColor?,
               barTintColor: UIColor?,
               tintColor: UIColor?) {

        self.delegate = delegate
        self.frame = frame ?? self.frame
        self.searchBarStyle = searchBarStyle
        self.placeholder = placeholder
        self.preferredFont = font
        self.preferredTextColor = textColor
        self.barTintColor = barTintColor ?? self.barTintColor
        self.tintColor = tintColor ?? self.tintColor
        self.bottomLineColor = tintColor ?? UIColor.clearColor()

        sizeToFit()

        //        translucent = false
        //        showsBookmarkButton = false
        //        showsCancelButton = true
        //        setShowsCancelButton(false, animated: false)
        //        customSearchBar.backgroundImage = UIImage()
    }

    required public init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
    }


    let bottomLine = CAShapeLayer()
    var bottomLineColor = UIColor.clearColor()

    override public func layoutSubviews() {
        super.layoutSubviews()

        for view in subviews {
            if let searchField = view as? UITextField { setSearchFieldAppearance(searchField); break }
            else {
                for sView in view.subviews {
                    if let searchField = sView as? UITextField { setSearchFieldAppearance(searchField); break }
                }
            }
        }

        bottomLine.path = UIBezierPath(rect: CGRectMake(0.0, frame.size.height - 1, frame.size.width, 1.0)).CGPath
        bottomLine.fillColor = bottomLineColor.CGColor
        layer.addSublayer(bottomLine)
    }

    func setSearchFieldAppearance(searchField: UITextField) {
        searchField.frame = CGRectMake(5.0, 5.0, frame.size.width - 10.0, frame.size.height - 10.0)
        searchField.font = preferredFont ?? searchField.font
        searchField.textColor = preferredTextColor ?? searchField.textColor
        //searchField.backgroundColor = UIColor.clearColor()
        //backgroundImage = UIImage()
    }

}

Init示例：

searchController = DSearchController(searchResultsController: ls,
                                     searchResultsUpdater: self,
                                     delegate: self,
                                     dimsBackgroundDuringPresentation: true,
                                     hidesNavigationBarDuringPresentation: true,
                                     searchBarDelegate: ls,
                                     searchBarFrame: CGRectMake(0.0, 0.0, SCREEN_WIDTH, 44.0),
                                     searchBarStyle: .Minimal,
                                     searchBarPlaceHolder: NSLocalizedString("Search a location...", comment: ""),
                                     searchBarFont: nil,
                                     searchBarTextColor: nil,
                                     searchBarBarTintColor: UIColor.whiteColor(),
                                     searchBarTintColor: iconsColor)
searchController.searchBar.keyboardAppearance = .Dark
definesPresentationContext = true
tableView.tableHeaderView = searchController.searchBar

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