在子视图中与 UITableView 交互 [英] Interacting with UITableView in a subview
本文介绍了在子视图中与 UITableView 交互的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我将 tableView 嵌入到自定义 UITextfield 的超级视图中.tableview 是在视图上显示结果，这意味着我希望能够滚动并选择 tableView 中的单元格.tableview 显示但我无法滚动或选择 tableView 单元格.
I embedded a tableView to the superview of a Custom UITextfield. The tableview is to display results on the view which means I want to be able to scroll and select a cell in the tableView. The tableview shows but I am unable to scroll or select the tableView cell.
这是 tableView 与 UIExfield 一起呈现的方式.
Here is how the tableView is rendered with the UITexfield.
UITexfield 扩展
override init(frame: CGRect) {
super.init(frame: frame)
shared()
commonInit()
if let superview = superview {
setupAutocompleteTable(superview)
}
}
public override func willMove(toSuperview newSuperview: UIView?) {
super.willMove(toSuperview: newSuperview)
commonInit()
setupAutocompleteTable(newSuperview!)
}
lazy var tableView: UITableView = {
let tableView = UITableView()
tableView.translatesAutoresizingMaskIntoConstraints = false
tableView.dataSource = self
tableView.delegate = self
tableView.rowHeight = autoCompleteCellHeight
tableView.isHidden = hidesWhenEmpty ?? true
tableView.layer.borderColor = UIColor.lightGray.cgColor
tableView.layer.borderWidth = 0.5
tableView.layer.zPosition = CGFloat(Float.greatestFiniteMagnitude)
return tableView
}()
fileprivate func setupAutocompleteTable(_ view: UIView) {
autoCompleteTableMargin = 10.0
view.addSubview(tableView)
tableView.topAnchor.constraint(equalTo: view.bottomAnchor, constant: 20).isActive = true
tableView.trailingAnchor.constraint(equalTo: view.trailingAnchor).isActive = true
tableView.leadingAnchor.constraint(equalTo: view.leadingAnchor).isActive = true
tableView.centerXAnchor.constraint(equalTo: view.centerXAnchor, constant: 0).isActive = true
tableView.heightAnchor.constraint(equalToConstant: 30).isActive = true
autoCompleteTableView = tableView
autoCompleteTableHeight = 200.0
}
视图控制器
lazy var searchField: GooglePlaceSearchField = {
let field = GooglePlaceSearchField()
field.translatesAutoresizingMaskIntoConstraints = true
field.placeholder = "Enter area, city .."
field.setIcon(#imageLiteral(resourceName: "zamasearch"))
field.highLightTypeTextedEnabled = true
return field
}()
view.addSubview(searchBgView)
searchBgView.addSubview(searchField)
有关如何与 tableView 交互的任何帮助
any help on how to interact with the tableView
searchField
searchBgView.anchor(top: view.safeAreaLayoutGuide.topAnchor, left: view.leftAnchor, bottom: nil, right: view.rightAnchor, paddingTop: 14, paddingLeft: 20, paddingBottom: 0, paddingRight: 20, width: 0, height: 50, enableInsets: false)
searchField.anchor(top: searchBgView.topAnchor, left: searchBgView.leftAnchor, bottom: searchBgView.bottomAnchor, right: iconContainerView.leftAnchor, paddingTop: 00, paddingLeft: 20, paddingBottom: 0, paddingRight: 0, width: 0, height: 0, enableInsets: false)
推荐答案
在重新阅读问题并遵循评论后，tableView 被添加为 textField 的同级......但同样的问题也适用.tableView 在其父视图的边界之外.
After re-reading the question and following comments, the tableView was being added as a sibling to the textField... the same issue applies though. The tableView is outside the bounds of its superview.
此示例仍可用作处理搜索背景视图"内的命中测试的起点(或者，将表用作字段的子视图，如此处所示).
This example can still be used as a starting point for handling the hit-testing inside the "search background view" (or, use the table as a subview of the field as shown here).
这是一个简单的示例，您应该可以将其用作自定义字段/数据源的基础.
Here's a quick example which you should be able to use as a base for your custom field / data source.
如果您注释掉 hitTest(...) 函数，您将看到该表，但无法与之交互.
If you comment-out the hitTest(...) func, you'll see the table but won't be able to interact with it.
注意:这只是示例代码，可以帮助您继续前进——不能被视为生产就绪.
Note: This is just example code to get you on your way -- not to be considered production-ready.
class MyCustomTextField: UITextField {
lazy var tableView: UITableView = {
let tableView = UITableView()
tableView.translatesAutoresizingMaskIntoConstraints = false
tableView.dataSource = self
tableView.delegate = self
tableView.layer.borderColor = UIColor.lightGray.cgColor
tableView.layer.borderWidth = 0.5
tableView.layer.zPosition = CGFloat(Float.greatestFiniteMagnitude)
return tableView
}()
let theData = [ "A", "B", "C", "D", "E", "F", "G", "H", "I" ]
// if we comment-out this func, we will NOT be able to interact with the tableView
override func hitTest(_ point: CGPoint, with event: UIEvent?) -> UIView? {
guard isUserInteractionEnabled else { return nil }
guard !isHidden else { return nil }
guard alpha >= 0.01 else { return nil }
let convertedPoint = tableView.convert(point, from: self)
if let v = tableView.hitTest(convertedPoint, with: event) {
return v
}
guard self.point(inside: point, with: event) else { return nil }
return self
}
override init(frame: CGRect) {
super.init(frame: frame)
setupAutocompleteTable(self)
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
public override func willMove(toSuperview newSuperview: UIView?) {
super.willMove(toSuperview: newSuperview)
setupAutocompleteTable(self)
}
fileprivate func setupAutocompleteTable(_ view: UIView) {
if tableView.superview == nil {
view.addSubview(tableView)
tableView.topAnchor.constraint(equalTo: view.bottomAnchor, constant: 20).isActive = true
tableView.trailingAnchor.constraint(equalTo: view.trailingAnchor).isActive = true
tableView.leadingAnchor.constraint(equalTo: view.leadingAnchor).isActive = true
tableView.heightAnchor.constraint(equalToConstant: 200).isActive = true
tableView.register(UITableViewCell.self, forCellReuseIdentifier: "TheCell")
}
}
}
extension MyCustomTextField: UITableViewDataSource {
func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return theData.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "TheCell", for: indexPath)
cell.textLabel?.text = theData[indexPath.row]
return cell
}
}
extension MyCustomTextField: UITableViewDelegate {
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
self.text = theData[indexPath.row]
}
}
class TextFieldSubViewController: UIViewController {
let customTextField: MyCustomTextField = {
let v = MyCustomTextField()
v.translatesAutoresizingMaskIntoConstraints = false
v.borderStyle = .roundedRect
v.backgroundColor = .yellow // makes it easy to see
return v
}()
override func viewDidLoad() {
super.viewDidLoad()
view.addSubview(customTextField)
NSLayoutConstraint.activate([
customTextField.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor, constant: 40.0),
customTextField.leadingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.leadingAnchor, constant: 40.0),
customTextField.trailingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.trailingAnchor, constant: -40.0),
])
}
}
结果:
编辑 2:
这是另一个快速示例，使用带有 UITextField、UIButton 和 UITableView 作为子视图(彼此的兄弟)的搜索背景视图".当文本字段开始/结束编辑时，表格视图将显示/隐藏.
Here's another quick example, using a "search background view" with UITextField, UIButton and UITableView as subviews (siblings of each other). The table view will show / hide when the text field Begins / Ends editing.
class CustomSearchView: UIView {
lazy var theTextField: UITextField = {
let v = UITextField()
v.translatesAutoresizingMaskIntoConstraints = false
v.borderStyle = .roundedRect
v.delegate = self
return v
}()
lazy var tableView: UITableView = {
let tableView = UITableView()
tableView.translatesAutoresizingMaskIntoConstraints = false
tableView.dataSource = self
tableView.delegate = self
tableView.layer.borderColor = UIColor.lightGray.cgColor
tableView.layer.borderWidth = 0.5
tableView.layer.zPosition = CGFloat(Float.greatestFiniteMagnitude)
return tableView
}()
let doneButton: UIButton = {
let v = UIButton()
v.translatesAutoresizingMaskIntoConstraints = false
v.setTitle("Done", for: .normal)
v.setTitleColor(.blue, for: .normal)
return v
}()
let theData = [ "A", "B", "C", "D", "E", "F", "G", "H", "I" ]
override init(frame: CGRect) {
super.init(frame: frame)
commonInit()
}
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
commonInit()
}
func commonInit() -> Void {
addSubview(theTextField)
addSubview(doneButton)
addSubview(tableView)
NSLayoutConstraint.activate([
doneButton.topAnchor.constraint(equalTo: topAnchor, constant: 4.0),
doneButton.bottomAnchor.constraint(equalTo: bottomAnchor, constant: -4.0),
doneButton.trailingAnchor.constraint(equalTo: trailingAnchor, constant: -8.0),
theTextField.leadingAnchor.constraint(equalTo: leadingAnchor, constant: 8.0),
theTextField.trailingAnchor.constraint(equalTo: doneButton.leadingAnchor, constant: -8.0),
theTextField.centerYAnchor.constraint(equalTo: doneButton.centerYAnchor),
tableView.topAnchor.constraint(equalTo: theTextField.bottomAnchor, constant: 8.0),
tableView.leadingAnchor.constraint(equalTo: theTextField.leadingAnchor, constant: 0.0),
tableView.trailingAnchor.constraint(equalTo: theTextField.trailingAnchor, constant: 0.0),
tableView.heightAnchor.constraint(equalToConstant: 200.0),
])
doneButton.setContentHuggingPriority(.required, for: .horizontal)
doneButton.addTarget(self, action: #selector(doneTapped), for: .touchUpInside)
tableView.register(UITableViewCell.self, forCellReuseIdentifier: "TheCell")
tableView.isHidden = true
}
@objc func doneTapped() -> Void {
self.endEditing(true)
}
// if we comment-out this func, we will NOT be able to interact with the tableView
// Note: this hitTest func based on source here: http://khanlou.com/2018/09/hacking-hit-tests/
override func hitTest(_ point: CGPoint, with event: UIEvent?) -> UIView? {
guard isUserInteractionEnabled else { return nil }
guard !isHidden else { return nil }
guard alpha >= 0.01 else { return nil }
for subview in subviews.reversed() {
let convertedPoint = subview.convert(point, from: self)
if let candidate = subview.hitTest(convertedPoint, with: event) {
return candidate
}
}
guard self.point(inside: point, with: event) else { return nil }
return self
}
}
extension CustomSearchView: UITextFieldDelegate {
func textFieldDidBeginEditing(_ textField: UITextField) {
tableView.isHidden = false
}
func textFieldDidEndEditing(_ textField: UITextField) {
tableView.isHidden = true
}
}
extension CustomSearchView: UITableViewDataSource {
func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return theData.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "TheCell", for: indexPath)
cell.textLabel?.text = theData[indexPath.row]
return cell
}
}
extension CustomSearchView: UITableViewDelegate {
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
self.theTextField.text = theData[indexPath.row]
}
}
class TextFieldSubViewController: UIViewController {
let customSearchView: CustomSearchView = {
let v = CustomSearchView()
v.translatesAutoresizingMaskIntoConstraints = false
v.backgroundColor = .lightGray
return v
}()
override func viewDidLoad() {
super.viewDidLoad()
view.addSubview(customSearchView)
NSLayoutConstraint.activate([
customSearchView.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor, constant: 0.0),
customSearchView.leadingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.leadingAnchor, constant: 0.0),
customSearchView.trailingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.trailingAnchor, constant: 0.0),
])
}
}
结果:
这篇关于在子视图中与 UITableView 交互的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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