在子视图中与 UITableView 交互
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【中文标题】在子视图中与 UITableView 交互【英文标题】:Interacting with UITableView in a subview 【发布时间】:2019-06-25 12:33:40 【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。表格视图显示,但我无法滚动或选择表格视图单元格。
这是使用 UITexfield 呈现 tableView 的方式。
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)
关于如何与 tableView 交互的任何帮助
searchField
的约束
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)
【问题讨论】:
酷,我明白了,所以这就像一个小的建议表,会在您输入时从文本字段中弹出。 您在哪里为searchField
设置约束?
searchField
被嵌入到searchBgView
中,该searchBgView
具有过滤按钮等其他组件,现在添加代码@Sh_Khan
@matt 我已经更新了问题
@King -- 您要添加UITableView
作为UITextField
的子视图?我的第一个想法是:表格视图超出了它的超级视图(文本字段)的范围。如果您在文本字段中设置.clipsToBounds = true
,那么您可能甚至不会看到表格视图。您需要实施命中测试以“启用”与表格视图的交互。
【参考方案1】:
编辑:
在重新阅读问题并关注 cmets 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。
此示例仍可用作在“搜索背景视图”中处理命中测试的起点(或者,将表格用作字段的子视图,如此处所示)。
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。
如果您注释掉 hitTest(...)
func,您将看到该表,但无法与之交互。
注意:这只是示例代码,可帮助您上路——不被视为生产就绪。
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:
这是另一个简单示例,使用“搜索背景视图”,UITextField
、UIButton
和 UITableView
作为子视图(彼此的兄弟)。当文本字段开始/结束编辑时,表格视图将显示/隐藏。
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:
【讨论】:
我必须认为有一天这对某人来说会非常有用。抱歉,我只能投票一次。以上是关于在子视图中与 UITableView 交互的主要内容,如果未能解决你的问题,请参考以下文章
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