UISearchBar和导航控制器中的两个按钮

Question

我正在尝试将两个按钮和一个SearchBar添加到我的导航控制器，但对齐方式不正确。我已经尝试了几乎所有的东西，比如改变SearchBar，UIButton的大小或改变Y的定位，但它没有用。知道如何解决这个问题吗？ 我使用的是iOS 11和Xcode 9

    searchController = UISearchController(searchResultsController: nil)
    searchController?.searchBar.frame = CGRect(x: 0, y: 0, width: 200, height: 30)
    searchController?.delegate = self
    searchController?.searchResultsUpdater = self

    let refineButton = UIButton.init(type: UIButtonType.custom)
    refineButton.frame = CGRect(x: 0, y: 0, width: 30, height: 30)
    refineButton.setImage(#imageLiteral(resourceName: "settings-button"), for: UIControlState.normal)
    refineButton.widthAnchor.constraint(equalToConstant: 30).isActive = true
    refineButton.heightAnchor.constraint(equalToConstant: 30).isActive = true


    let refineItem = UIBarButtonItem(customView: refineButton)


    navigationItem.leftBarButtonItem = refineItem
    navigationItem.titleView = searchController?.searchBar
    searchController?.searchBar.sizeToFit()

Answer 1

请检查：

override func viewWillLayoutSubviews() {
    searchController?.searchBar.frame = CGRect(x: 0, y: 0, width: 300, height: 30)
    searchController?.searchBar.sizeToFit()
}