ios - 如何更改 UISearchController 中 UISearchBar 的颜色

Question

我有一个 UISearchBar，它是 UISearchController 的一部分，位于 UICollectionViewController 之上。我想更改 UISearchBar 的背景，使其成为我选择的图像，并且文本字段的背景为半透明。基本上，我想改变这个:

进入此:

我已经尝试了这里能找到的一切。我尝试了 searchBar.SetBackgroundImage 与 UISearchBarPosition 和 UIBarMetrics 的每一个可能的组合，但它们都不起作用。我所能达到的最好效果就是更改搜索图标。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。这是我设置的。

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)
}