在 UISearchController 上使用背景图片 iOS 11

Question

我正在为我的 UITableView 实现 UISearchController，但我正在为 iOS 11 的自定义而苦苦挣扎。我的导航栏正在使用我想要的渐变图像背景匹配的搜索控制器，但我还没有找到为 UISearchController 设置背景图像的方法。它在 UISearchController 上作为 TableHeaderView 完美运行，但在 iOS 11 中几乎没有任何自定义传递。

当前结果：

期望的结果：

这是我正在使用的代码： （在 viewDidLoad 上调用）

private func setupSearchController() {

    let searchController = UISearchController(searchResultsController: nil)

    // Convert CAGradientLayer to UIImage
    let gradient = Color.blue.gradient
    gradient.frame = searchController.searchBar.bounds
    UIGraphicsBeginImageContext(gradient.bounds.size)
    gradient.render(in: UIGraphicsGetCurrentContext()!)
    let gradientImage = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()

    // Setup the Search Controller
    searchController.searchBar.backgroundImage = gradientImage
    searchController.searchBar.isTranslucent = false
    searchController.searchResultsUpdater = self
    searchController.hidesNavigationBarDuringPresentation = false
    searchController.dimsBackgroundDuringPresentation = false
    searchController.obscuresBackgroundDuringPresentation = false
    searchController.searchBar.placeholder = "Search by transaction name"
    searchController.searchBar.tintColor = Color.custom(hexString: "FAFAFA", alpha: 1).value
    definesPresentationContext = true
    searchController.searchBar.delegate = self

    // Implement Search Controller
    if #available(iOS 11.0, *) {
        navigationItem.searchController = searchController
        navigationItem.hidesSearchBarWhenScrolling = false
        navigationController?.navigationBar.setBackgroundImage(gradientImage, for: .default)
    } else {
        tableView.tableHeaderView = searchController.searchBar
    }

}

Answer 1

您可以为此添加一个 CustomView。使用 CustomView 将您的 searchBar 添加到其中，然后将此 customView 添加到您的 ViewController。现在你可以轻松的将这个customView的背景设置为：

//if customView is named as customView

    let backgroundImage = UIImageView(frame: UIScreen.mainScreen().bounds)
    backgroundImage.image = UIImage(named: "background.png")
    self.customView.insertSubview(backgroundImage, atIndex: 0)

Answer 2

多亏了，我在搜索了一段时间后找到了一个不错的解决方案。

这就是我为 iOS 11 实现背景图像的方式：

    // Implement Search Controller
    if #available(iOS 11.0, *) {
        if let navigationBar = self.navigationController?.navigationBar {
            navigationBar.barTintColor = UIColor(patternImage: gradientImage!)
        }
        if let textField = searchController.searchBar.value(forKey: "searchField") as? UITextField {
            if let backgroundview = textField.subviews.first {
                backgroundview.backgroundColor = UIColor.white
                backgroundview.layer.cornerRadius = 10;
                backgroundview.clipsToBounds = true;

            }
        }
        navigationItem.searchController = searchController
        navigationItem.hidesSearchBarWhenScrolling = false
    } else {
        tableView.tableHeaderView = searchController.searchBar
    }

在 UISearchController 上使用背景图片 iOS 11

Use background image on UISearchController iOS 11

swift

uinavigationcontroller

uisearchcontroller