本文介绍了如何在UITableView内部的UITableView内部实现UITextView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
如何在UITableView内的UITableView内实现UITextView?
how to implement UITextView inside UITableView inside UITableView ??
(1)如果在"UITextView"中键入文本，则"UITableViewCell2"的高度会自动增加.
(1) If you type text in 'UITextView', the height of 'UITableViewCell2' is automatically increased.
(2)当"UITableViewCell2"的高度增加时，"UITableViewCell2"的高度也会相应地自动增加.
(2) When the height of 'UITableViewCell2' is increased, the height of 'UITableViewCell' is automatically increased accordingly.
我已经实现了(1)的情况，但没有实现(2)的情况.
I have implemented the case of (1) but not (2).
我应该如何实施?
推荐答案
您可能想尝试一下...
You might want to give this a try...
它使用单节表格视图.每个单元格都包含一个 UIStackView ，用于排列(变量) UITextView .
It using a single-section table view. Each cell contains a UIStackView that arranges the (variable) UITextViews.
没有 @IBOutlet 或 @IBAction 或原型单元格连接...只需分配标准的 UIViewController 自定义 TableTextViewsViewController 的类:
No @IBOutlet or @IBAction or prototype cell connections... just assign a standard UIViewController custom class to TableTextViewsViewController:
//
// TableTextViewsViewController.swift
// Created by Don Mag on 3/10/20.
//
import UIKit
class TextViewsCell: UITableViewCell, UITextViewDelegate {
let frameView: UIView = {
let v = UIView()
v.backgroundColor = .clear
v.layer.borderColor = UIColor(red: 0.0, green: 0.5, blue: 0.0, alpha: 1.0).cgColor
v.layer.borderWidth = 1
v.translatesAutoresizingMaskIntoConstraints = false
return v
}()
let stackView: UIStackView = {
let v = UIStackView()
v.axis = .vertical
v.spacing = 8
v.translatesAutoresizingMaskIntoConstraints = false
return v
}()
let stackViewPadding: CGFloat = 8.0
var textViewCosure: ((Int, String)->())?
override init(style: UITableViewCell.CellStyle, reuseIdentifier: String?) {
super.init(style: style, reuseIdentifier: reuseIdentifier)
commonInit()
}
required init?(coder: NSCoder) {
super.init(coder: coder)
commonInit()
}
func commonInit() -> Void {
let g = contentView.layoutMarginsGuide
contentView.addSubview(frameView)
frameView.addSubview(stackView)
// bottom constraint needs to be less than 1000 (required) to avoid auot-layout warnings
let frameViewBottomConstrait = frameView.bottomAnchor.constraint(equalTo: g.bottomAnchor, constant: 0.0)
frameViewBottomConstrait.priority = UILayoutPriority(rawValue: 999)
NSLayoutConstraint.activate([
frameView.topAnchor.constraint(equalTo: g.topAnchor, constant: 0.0),
frameView.leadingAnchor.constraint(equalTo: g.leadingAnchor, constant: 0.0),
frameView.trailingAnchor.constraint(equalTo: g.trailingAnchor, constant: 0.0),
frameViewBottomConstrait,
stackView.topAnchor.constraint(equalTo: frameView.topAnchor, constant: stackViewPadding),
stackView.leadingAnchor.constraint(equalTo: frameView.leadingAnchor, constant: stackViewPadding),
stackView.trailingAnchor.constraint(equalTo: frameView.trailingAnchor, constant: -stackViewPadding),
stackView.bottomAnchor.constraint(equalTo: frameView.bottomAnchor, constant: -stackViewPadding),
])
}
override func prepareForReuse() {
super.prepareForReuse()
stackView.arrangedSubviews.forEach {
$0.removeFromSuperview()
}
}
func fillData(_ strings: [String]) -> Void {
strings.forEach {
let v = UITextView()
v.font = UIFont.systemFont(ofSize: 16.0)
v.isScrollEnabled = false
// hugging and compression resistance set to required for cell expansion animation
v.setContentHuggingPriority(.required, for: .vertical)
v.setContentCompressionResistancePriority(.required, for: .vertical)
v.text = $0
// frame the text view
v.layer.borderColor = UIColor.blue.cgColor
v.layer.borderWidth = 1
v.delegate = self
stackView.addArrangedSubview(v)
}
}
func textViewDidChange(_ textView: UITextView) {
guard let idx = stackView.arrangedSubviews.firstIndex(of: textView) else {
fatalError("Shouldn't happen, but couldn't find the textView index")
}
textViewCosure?(idx, textView.text)
}
}
class TableTextViewsViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
let topLabel: UILabel = {
let v = UILabel()
v.text = "Top Label"
v.translatesAutoresizingMaskIntoConstraints = false
return v
}()
let tableView: UITableView = {
let v = UITableView()
v.layer.borderColor = UIColor.red.cgColor
v.layer.borderWidth = 1
v.translatesAutoresizingMaskIntoConstraints = false
return v
}()
var myData: [[String]] = [[String]]()
var textViewsInRows: [Int] = [
3, 4, 2, 6, 1, 4, 3,
]
override func viewDidLoad() {
super.viewDidLoad()
// generate some dummy data
var i = 1
textViewsInRows.forEach {
var s: [String] = [String]()
for j in 1...$0 {
s.append("Table Row: \(i) TextView \(j)")
}
myData.append(s)
i += 1
}
view.addSubview(topLabel)
view.addSubview(tableView)
let g = view.safeAreaLayoutGuide
NSLayoutConstraint.activate([
topLabel.topAnchor.constraint(equalTo: g.topAnchor, constant: 8.0),
topLabel.leadingAnchor.constraint(equalTo: g.leadingAnchor, constant: 8.0),
topLabel.trailingAnchor.constraint(equalTo: g.trailingAnchor, constant: -8.0),
tableView.topAnchor.constraint(equalTo: topLabel.bottomAnchor, constant: 8.0),
tableView.leadingAnchor.constraint(equalTo: g.leadingAnchor, constant: 8.0),
tableView.trailingAnchor.constraint(equalTo: g.trailingAnchor, constant: -8.0),
tableView.bottomAnchor.constraint(equalTo: g.bottomAnchor, constant: -8.0),
])
tableView.dataSource = self
tableView.delegate = self
tableView.separatorStyle = .none
tableView.keyboardDismissMode = .onDrag
tableView.register(TextViewsCell.self, forCellReuseIdentifier: "TextViewsCell")
}
// MARK: - Table view data source
func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return myData.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "TextViewsCell", for: indexPath) as! TextViewsCell
cell.fillData(myData[indexPath.row])
cell.textViewCosure = { [weak self] idx, str in
// update our data
self?.myData[indexPath.row][idx] = str
// update table view cell height
self?.tableView.beginUpdates()
self?.tableView.endUpdates()
}
return cell
}
}
结果-红色边框是tableView，绿色边框是每个单元格的contentView，蓝色边框是每个textView:
Result - red border is the tableView, green border is each cell's contentView, blue border is each textView:
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