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我想使用 UITextField 创建一个搜索栏。我尝试将 NavigationItem 的 TitleView 设置为文本字段并设置相应的约束。但是导航栏中心的文本字段仍然很短。如何使文本字段填满整个导航栏？这是我的代码：

cancelbtn = UIBarButtonItem(title: "Cancel", style: .plain, target: self, action: #selector(CourseTableViewController.searchCancelled))
self.navigationItem.leftBarButtonItem = cancelbtn

let searchField = UITextField()
searchField.translatesAutoresizingMaskIntoConstraints = false
searchField.borderStyle = .roundedRect
self.navigationItem.titleView = searchField
self.navigationItem.titleView!.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: cancelbtn.width)
self.navigationItem.titleView!.widthAnchor.constraint(equalToConstant: view.frame.size.width - cancelbtn.width)

它看起来如何 rn: UIView

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2 回答 2

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您应该阅读 Apple 指南。从 iOS11 开始，您应该将 searchBar 安装到 navigationItem 中。尝试使用此代码：

import UIKit

class ViewController: UIViewController, UISearchControllerDelegate {

var searchController = UISearchController()

override func viewDidLoad() {
    super.viewDidLoad()

    navigationController?.navigationBar.prefersLargeTitles = false
    searchController = UISearchController(searchResultsController: nil)
    searchController.delegate = self

    // Customisation 
    searchController.searchBar.tintColor = .black
    searchController.dimsBackgroundDuringPresentation = false

    navigationItem.searchController = searchController
    navigationItem.hidesSearchBarWhenScrolling = false
}

}
于 2018-10-01T03:24:01.317 回答
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我解决了我的问题。我没有使用titleView，而是将文本字段放在右侧的barButtonItem 中，并将其宽度设置为view.frame.size.width。这给了我一个占据整个导航的文本字段。我在这里附上了代码，以防有人也想这样做。

searchBar = UISearchBar()
searchBar.showsCancelButton = false
searchBar.placeholder = "Course name"
searchBar.delegate = self
cancelbtn = UIBarButtonItem(title: "Cancel", style: .plain, target: self, action: #selector(CourseTableViewController.searchCancelled))
self.navigationItem.leftBarButtonItem = cancelbtn

searchTextField = UITextField()
searchTextField.borderStyle = .roundedRect
searchTextField.widthAnchor.constraint(equalToConstant: view.frame.size.width - cancelbtn.width)
searchTextField.translatesAutoresizingMaskIntoConstraints = false
self.navigationItem.rightBarButtonItem = UIBarButtonItem(customView: searchTextField)
self.navigationItem.rightBarButtonItem?.width = view.frame.size.width
于 2018-10-01T03:49:24.777 回答