如何判断自定义 UISearchBar 中的 UITableView 是不是被触摸?
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【中文标题】如何判断自定义 UISearchBar 中的 UITableView 是不是被触摸?【英文标题】:How to tell if UITableView in custom UISearchBar is touched?如何判断自定义 UISearchBar 中的 UITableView 是否被触摸? 【发布时间】:2021-05-31 23:24:57 【问题描述】:我正在尝试创建一个自定义 UISearchBar,它被放置为 titleView
的 titleView
。使用以下代码,建议的suggestionTableView
完美出现;但是,它不识别任何水龙头。事实上,就像suggestionTableView
甚至不存在一样,因为我的点击正在根据suggestionTableView
的建议发送到另一个视图。有人告诉我我可以使用hitTest(...)
来捕捉这些触摸,但我不知道如何在我的SuggestionSearchBar
或ViewController
中实现这一点。如何将这些触摸发送到suggestionTableView
?
建议搜索栏
class SuggestionSearchBar: UISearchBar, UISearchBarDelegate
var suggestionTableView = UITableView(frame: .zero)
let allPossibilities: [String]!
var possibilities = [String]()
//let del: UISearchBarDelegate!
init(del: UISearchBarDelegate, dropDownPossibilities: [String])
self.allPossibilities = dropDownPossibilities
super.init(frame: .zero)
isUserInteractionEnabled = true
delegate = del
searchTextField.addTarget(self, action: #selector(searchBar(_:)), for: .editingChanged)
searchTextField.addTarget(self, action: #selector(searchBarCancelButtonClicked(_:)), for: .editingDidEnd)
sizeToFit()
addTableView()
required init?(coder: NSCoder)
fatalError("init(coder:) has not been implemented")
private func addTableView()
let cellHeight = UITableViewCell(style: UITableViewCell.CellStyle.default, reuseIdentifier: "").frame.height
suggestionTableView.register(UITableViewCell.self, forCellReuseIdentifier: "cell")
suggestionTableView.backgroundColor = UIColor.clear
//suggestionTableView.separatorStyle = .none
suggestionTableView.tableFooterView = UIView()
addSubview(suggestionTableView)
suggestionTableView.delegate = self
suggestionTableView.dataSource = self
suggestionTableView.translatesAutoresizingMaskIntoConstraints = false
NSLayoutConstraint.activate([
suggestionTableView.topAnchor.constraint(equalTo: bottomAnchor),
suggestionTableView.rightAnchor.constraint(equalTo: rightAnchor),
suggestionTableView.leftAnchor.constraint(equalTo: leftAnchor),
suggestionTableView.heightAnchor.constraint(equalToConstant: cellHeight*6),
])
hideSuggestions()
func showSuggestions()
let sv = suggestionTableView.superview
sv?.clipsToBounds = false
suggestionTableView.isHidden = false
func hideSuggestions()
suggestionTableView.isHidden = true
@objc func searchBar(_ searchBar: UISearchBar)
print(searchBar.text?.uppercased() ?? "")
showSuggestions()
possibilities = allPossibilities.filter $0.contains(searchBar.text?.uppercased() ?? "")
print(possibilities.count)
suggestionTableView.reloadData()
if searchBar.text == "" || possibilities.count == 0
hideSuggestions()
@objc func searchBarCancelButtonClicked(_ searchBar: UISearchBar)
hideSuggestions()
extension SuggestionSearchBar: UITableViewDataSource, UITableViewDelegate
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int
return possibilities.count
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell
let cell = suggestionTableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath)
cell.backgroundColor = UIColor(red: 0.25, green: 0.25, blue: 0.25, alpha: 0.75)
if traitCollection.userInterfaceStyle == .light
cell.backgroundColor = UIColor(red: 1, green: 1, blue: 1, alpha: 0.75)
cell.textLabel?.text = possibilities[indexPath.row]
return cell
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath)
//add method that fills in and searches based on the text in that indexpath.row
print("selected")
视图控制器
import UIKit
class ViewController: UIViewController
lazy var searchBar = SuggestionSearchBar(del: self, dropDownPossibilities: ["red","green","blue","yellow"])
override func viewDidLoad()
super.viewDidLoad()
setUpUI()
func setUpUI()
setUpSearchBar()
extension ViewController: UISearchBarDelegate
func setUpSearchBar()
searchBar.searchBarStyle = UISearchBar.Style.prominent
searchBar.placeholder = "Search"
searchBar.sizeToFit()
searchBar.isTranslucent = false
searchBar.backgroundImage = UIImage()
searchBar.delegate = self
navigationItem.titleView = searchBar
func searchBarSearchButtonClicked(_ searchBar: UISearchBar)
print(searchBar.text!)
func searchBarCancelButtonClicked(_ searchBar: UISearchBar)
searchBar.endEditing(true)
func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String)
【问题讨论】:
我认为这不是你真正需要的,但如果你想了解如何使用 hitTest,请搜索 UIView Swift hitTest。 您是否查看了我对您上一个问题的答案所做的编辑? ***.com/questions/67731865/… @DonMag 对不起,我想我错过了。我刚刚尝试过,但它仍然不允许我单击建议表视图单元格。您还有其他可行的建议吗? @ElTomato 你觉得我需要什么? @helloworld12345 请检查我的答案! 【参考方案1】:查看您提供的代码,我可以让 UI 正常工作,甚至可以在 SuggestionSearchBar
中获取 UITableViewDelegate
回调。
以下是变化
建议搜索栏
class SuggestionSearchBar: UISearchBar, UISearchBarDelegate
var suggestionTableView = UITableView(frame: .zero)
let allPossibilities: [String]!
var possibilities = [String]()
var fromController: UIViewController?
//let del: UISearchBarDelegate!
init(del: UISearchBarDelegate, dropDownPossibilities: [String], fromController: UIViewController)
self.fromController = fromController
self.allPossibilities = dropDownPossibilities
super.init(frame: .zero)
isUserInteractionEnabled = true
delegate = del
searchTextField.addTarget(self, action: #selector(searchBar(_:)), for: .editingChanged)
searchTextField.addTarget(self, action: #selector(searchBarCancelButtonClicked(_:)), for: .editingDidEnd)
sizeToFit()
addTableView()
required init?(coder: NSCoder)
fatalError("init(coder:) has not been implemented")
private func addTableView()
guard let view = fromController?.view else return
let cellHeight = UITableViewCell(style: UITableViewCell.CellStyle.default, reuseIdentifier: "").frame.height
suggestionTableView.register(UITableViewCell.self, forCellReuseIdentifier: "cell")
suggestionTableView.backgroundColor = UIColor.clear
//suggestionTableView.separatorStyle = .none
suggestionTableView.tableFooterView = UIView()
view.addSubview(suggestionTableView)
// addSubview(suggestionTableViewse
suggestionTableView.delegate = self
suggestionTableView.dataSource = self
suggestionTableView.translatesAutoresizingMaskIntoConstraints = false
NSLayoutConstraint.activate([
suggestionTableView.topAnchor.constraint(equalTo: view.topAnchor),
suggestionTableView.rightAnchor.constraint(equalTo: view.rightAnchor),
suggestionTableView.leftAnchor.constraint(equalTo: view.leftAnchor),
suggestionTableView.heightAnchor.constraint(equalToConstant: cellHeight*6),
])
hideSuggestions()
func showSuggestions()
let sv = suggestionTableView.superview
sv?.clipsToBounds = false
suggestionTableView.isHidden = false
func hideSuggestions()
suggestionTableView.isHidden = true
@objc func searchBar(_ searchBar: UISearchBar)
print(searchBar.text?.uppercased() ?? "")
showSuggestions()
possibilities = allPossibilities.filter $0.contains(searchBar.text?.lowercased() ?? "")
print(possibilities.count)
suggestionTableView.reloadData()
if searchBar.text == "" || possibilities.count == 0
hideSuggestions()
@objc func searchBarCancelButtonClicked(_ searchBar: UISearchBar)
hideSuggestions()
视图控制器
class ViewController: UIViewController
lazy var searchBar = SuggestionSearchBar(del: self, dropDownPossibilities: ["red","green","blue","yellow"], fromController: self)
override func viewDidLoad()
super.viewDidLoad()
setUpUI()
func setUpUI()
setUpSearchBar()
总结一下变化,上面的代码尝试添加suggestionTableView
到 SearchBarView 这是不可能的,所以我使用对存储为的父 ViewController 的引用初始化 SearchBarView
var fromController: UIViewController?
这个属性后来用在addTableView()
private func addTableView()
guard let view = fromController?.view else return
let cellHeight = UITableViewCell(style: UITableViewCell.CellStyle.default, reuseIdentifier: "").frame.height
suggestionTableView.register(UITableViewCell.self, forCellReuseIdentifier: "cell")
suggestionTableView.backgroundColor = UIColor.clear
//suggestionTableView.separatorStyle = .none
suggestionTableView.tableFooterView = UIView()
view.addSubview(suggestionTableView)
// addSubview(suggestionTableViewse
suggestionTableView.delegate = self
suggestionTableView.dataSource = self
suggestionTableView.translatesAutoresizingMaskIntoConstraints = false
NSLayoutConstraint.activate([
suggestionTableView.topAnchor.constraint(equalTo: view.topAnchor),
suggestionTableView.rightAnchor.constraint(equalTo: view.rightAnchor),
suggestionTableView.leftAnchor.constraint(equalTo: view.leftAnchor),
suggestionTableView.heightAnchor.constraint(equalToConstant: cellHeight*6),
])
hideSuggestions()
还有一个小改动
possibilities = allPossibilities.filter $0.contains(searchBar.text?.lowercased() ?? "")
在@objc func searchBar(_ searchBar: UISearchBar)
结果
【讨论】:
【参考方案2】:只要您将UITableView
作为子视图添加到SearchBar
或UINavigationBar
,您就会不断发现这些触摸问题。
解决此问题的一种可能方法是在调用站点有一个空容器 UIView
实例(在您的情况下为 ViewController
)并要求 SuggestionsSearchBar
在该容器内添加它的 tableView
。
SuggestionSearchBar(
del: self,
suggestionsListContainer: <UIStackView_Inside_ViewController>,
dropDownPossibilities: ["red","green","blue","yellow"]
)
SuggestionsSearchBar
仍将管理有关 tableView 的数据源、委托、可见性等的所有内容。它只需要一个可以从调用站点保存它的 tableView 的视图。
更新
我只强调需要更改的相关部分 - 其他一切都保持不变。
class SuggestionSearchBar: UISearchBar, UISearchBarDelegate
init(del: UISearchBarDelegate, suggestionsListContainer: UIStackView, dropDownPossibilities: [String])
//// All the current setUp
addTableView(in: suggestionsListContainer)
private func addTableView(in container: UIStackView)
//// All the current setUp
container.addArrangedSubview(suggestionTableView)
NSLayoutConstraint.activate([
suggestionTableView.heightAnchor.constraint(equalToConstant: cellHeight*6),
/// We need to assign only height here
/// top, leading, trailing will be driven by container at call site
])
class ViewController: UIViewController
lazy var suggestionsListContainer: UIStackView =
let stackView = UIStackView()
stackView.axis = .vertical
stackView.distribution = .fill
stackView.translatesAutoresizingMaskIntoConstraints = false
return stackView
()
lazy var searchBar = SuggestionSearchBar(
del: self,
suggestionsListContainer: suggestionsListContainer,
dropDownPossibilities: ["red","green","blue","yellow"]
)
func setUpUI()
setUpSearchBar()
setUpSuggestionsListContainer()
func setUpSuggestionsListContainer()
self.view.addSubview(suggestionsListContainer)
NSLayoutConstraint.activate([
suggestionsListContainer.topAnchor.constraint(equalTo: self.view.topAnchor),
suggestionsListContainer.leadingAnchor.constraint(equalTo: self.view.leadingAnchor),
suggestionsListContainer.trailingAnchor.constraint(equalTo: self.view.trailingAnchor),
/// Height is not needed as it will be driven by tableView's height
])
【讨论】:
我需要在 SuggestionSearchBar 类中添加什么代码? 不是将tableView添加到selfaddSubview(suggestionTableView)
,而是将其添加到传入的suggestionsListContainer
,如suggestionsListContainer.addArrangedSubview(suggestionTableView)
你能在你的答案中写出代码来展示如何在 ViewController 和 SuggestionSearchBar 中实现
请参阅更新我的回答。
我试过用这个,但是之前出现的suggestionTableView
现在已经不出现了,请问有这个原因吗?以上是关于如何判断自定义 UISearchBar 中的 UITableView 是不是被触摸?的主要内容,如果未能解决你的问题,请参考以下文章
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