Question

We're having a weird issue with using a UISearchController as an item in a navigation bar. It's set as the left bar button item and when a user taps to start searching, the search bar expands to the right off the side of the screen.

Below is the code for creating the UISearchController:

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

    controller.searchBar.frame = CGRect(x: 0, y: 0, width: 266, height: 44.0)
    let searchBarView = UIView(frame: controller.searchBar.frame)
    searchBarView.addSubview(controller.searchBar)

    controller.searchBar.backgroundImage = UIImage(named: "searchBarBG")
    controller.searchBar.barTintColor = .white
    controller.searchBar.subviews[0].subviews.flatMap(){ $0 as? UITextField }.first?.tintColor = Constants.Colors.Red

    navigationItem.leftBarButtonItem = UIBarButtonItem(customView: searchBarView)

    return controller
})()

When the screen first loads, it looks like this.

After tapping on the search bar, it changes to look like this.

I have no idea what's causing this. After lots of searching, I tried changing self.definesPresentationContext = false; and self.extendedLayoutIncludesOpaqueBars = true as well as adjusting similar checkboxes in the storyboard. Any tips?

Edit: This only seems to happen on iOS 11. In 10.3, the search bar actually shrinks a little to accommodate the Cancel button but ultimately takes up the same amount of space.

Answer 1

如果您不需要UISearchBarController的附加功能，则可以直接使用UISearchBar，其具有更可预测的大小调整行为：

let searchBar = UISearchBar(frame: CGRect(x: 0, y: 0, width: 200, height: 20))
searchBar.delegate = self
navigationItem.leftBarButtonItem = UIBarButtonItem(customView: searchBar)

请注意，如果您使用内置取消按钮或其他类似功能，则必须在委托方法中手动处理它们。

Answer 2

我最终通过覆盖didPresentSearchController和didDismissSearchController方法作为UISearchControllerDelegate的一部分来解决此问题。

extension ContactUsViewController: UISearchControllerDelegate {

    func didPresentSearchController(_ searchController: UISearchController) 
    {
        searchController.searchBar.frame = CGRect(x: 0, y: 0, width: 266, height: 44.0)
    }

    func didDismissSearchController(_ searchController: UISearchController) 
    {
        searchController.searchBar.frame = CGRect(x: 0, y: 0, width: 266, height: 44.0)
    }
}

UISearchController expands off screen when tapped

2 个答案: