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保留UISearchBar的边距

uisearchcontroller uisearchbar uikit swift ios

art-of-dreams · 技术社区 · 6 年前

searchView

    let searchController = UISearchController(searchResultsController: nil)
    self.searchController = searchController

    let searchBarBackground = UIImage.roundedImage(UIImage.image(with: #colorLiteral(red: 0.5568627451, green: 0.5568627451, blue: 0.5764705882, alpha: 0.2), size: size), cornerRadius: cornerRadius)
    searchController.searchBar.setSearchFieldBackgroundImage(searchBarBackground, for: .normal)
    searchController.searchBar.searchTextPositionAdjustment = UIOffsetMake(8.0, 0.0)
    searchController.searchBar.searchBarStyle = .minimal
    searchController.searchBar.barStyle = .black
    searchController.searchBar.delegate = self

    searchView.addSubview(searchController.searchBar)

我不知道如何使搜索栏保留主视图的边距。当我尝试将约束添加到容器视图并将搜索栏添加为子视图时,搜索栏不考虑尾部约束。

即使手动设置搜索栏框架也等于中的内容视图边界 viewDidLayoutSubviews

我怎样才能做到呢?也许可以更改搜索栏的默认边距?谢谢。

2 回复 | 直到 6 年前

art-of-dreams 6 年前

viewDidAppear(_:) 用于初始设置。

override func viewDidAppear(_ animated: Bool) {
    super.viewDidAppear(animated)
    searchController?.searchBar.frame.size.width = searchView.bounds.width
}

func didPresentSearchController(_ searchController: UISearchController) {
    searchController.searchBar.frame.size.width = self.searchView.bounds.width
}

func didDismissSearchController(_ searchController: UISearchController) {
    searchController.searchBar.frame.size.width = self.searchView.bounds.width
}

ezaji 6 年前

问题是您以编程方式创建视图并使用自动调整大小掩码。

https://developer.apple.com/documentation/uikit/uiview/1622572-translatesautoresizingmaskintoco

简单UISearchBar示例:

class ViewController: UIViewController, UISearchBarDelegate {

    weak var searchBar: UISearchBar?

    override func viewDidLoad() {
        super.viewDidLoad()

        let searchBar = UISearchBar(frame: .zero)
        self.searchBar = searchBar
        searchBar.searchBarStyle = .minimal
        searchBar.barStyle = .black
        searchBar.delegate = self
        searchBar.translatesAutoresizingMaskIntoConstraints = false

        view.addSubview(searchBar)
        NSLayoutConstraint.activate([
            searchBar.topAnchor.constraint(equalTo: view.topAnchor, constant: 50.0),
            searchBar.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 40.0),
            view.trailingAnchor.constraint(equalTo: searchBar.trailingAnchor, constant: 40.0),
        searchBar.heightAnchor.constraint(equalToConstant: 36.0)
            ])
    }
}