在UISearchBar中设置文本字段

Question

我试图将SearchController添加到UINavigationBar。我试图在UINavigationController的后退按钮之后设置UISearchBar的UITextField。我想在后退按钮后有更多空间

当我开始搜索时，它显示为

然而，我应该能够查看后退按钮。只应减少文本字段宽度。在取消之后，它应该再次回到初始布局。而它显示如下：

以下是我的代码

var searchResultController = UISearchController()

self.searchResultController = ({

    let controller = UISearchController(searchResultsController: nil)
    controller.searchResultsUpdater = self
    controller.dimsBackgroundDuringPresentation = false
    controller.searchBar.sizeToFit()
    controller.searchBar.delegate = self

    controller.hidesNavigationBarDuringPresentation = false
    self.navigationController?.navigationBar.addSubview(controller.searchBar)

    return controller
})()

override func viewDidAppear(animated: Bool) {
    for subView in searchResultController.searchBar.subviews{
        for subsubView in subView.subviews  {
            if let textField = subsubView as? UITextField {
                var bounds: CGRect
                bounds = textField.frame
                bounds.size.width = self.view.bounds.width - 50    
            }
        }

    }
}

请告诉我如何解决此问题。

提前致谢

Answer 1

要设置UIsearchBar，请将其添加到导航的titleView为

self.navigationItem.titleView = controller.searchBar

要删除取消按钮，我们可以使用UISearchControllerDelegate方法

func didPresentSearchController(searchController: UISearchController) {
    searchController.searchBar.showsCancelButton = false
}

希望这对任何人都有帮助。