如何在UISearchController中更改UISearchBar的颜色

Question

我有一个UISearchBar，它是UISearchController的一部分，位于UICollectionViewController之上。我想改变UISearchBar的背景，这样它就是我选择的图像，而textfield的背景是半透明的。基本上，我想转此：

进入这个：

我已经尝试了我能在这里找到的一切。我尝试使用UISearchBarPosition和UIBarMetrics的每一个可能组合的searchBar.SetBackgroundImage，它们都不起作用。我达到的最好的是改变搜索的图标。这对我没有任何帮助。我认为这是因为它嵌入在UINavigationItem中。我不知道为什么它不起作用。这就是我设置的内容。

var resultSearchController:UISearchController? = nil

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.

        let searchTable = storyboard!.instantiateViewControllerWithIdentifier("SearchTable") as! SearchTable
        resultSearchController = UISearchController(searchResultsController: searchTable)
        resultSearchController?.searchResultsUpdater = searchTable

        //Sets up the search bar and adds it to navigation header
        let searchBar = resultSearchController!.searchBar
        searchBar.searchBarStyle = UISearchBarStyle.Minimal
        searchBar.sizeToFit()
        searchBar.placeholder = "Find a Result"
        navigationItem.titleView = resultSearchController?.searchBar
               searchBar.setBackgroundImage(UIImage(named: "Horses.jpg"), forBarPosition: UIBarPosition.Any, barMetrics: UIBarMetrics.Default)

        resultSearchController?.hidesNavigationBarDuringPresentation = false
        resultSearchController?.dimsBackgroundDuringPresentation = true
        definesPresentationContext = true


    }

Answer 1

这是代码：

searchBar.setImage(UIImage(named: "Horses"), forSearchBarIcon: UISearchBarIcon.Search, state: UIControlState.Normal);

var searchTextField: UITextField? = searchBar.valueForKey("searchField") as? UITextField
if searchTextField!.respondsToSelector(Selector("attributedPlaceholder")) {
    var color = UIColor.purpleColor()
    let attributeDict = [NSForegroundColorAttributeName: UIColor.purpleColor()]
    searchTextField!.attributedPlaceholder = NSAttributedString(string: "search", attributes: attributeDict)
}