如何使用IOS 12在UITableViewCell内正确添加UICollectionView [英] How to properly add an UICollectionView inside UITableViewCell using IOS 12
问题描述
由于某些原因,当我使用Xcode 10 beta时,无法在表视图单元格中正确显示集合中的某些项目.在过去的四天里,我都尽力了.
我做了一个小项目样本,以查看问题所在.
如果有人想在本地运行完整代码,请参见:
这是运行时的外观:
细胞被压扁,顶部的标签消失.我想要的是集合视图应该增长以显示所有元素,并使表格视图单元格调整大小,但是目前还没有发生,我无法弄清楚问题出在哪里.
如果需要以下输出:
代码ViewController:
class ViewController:UIViewController {让列表= [字符串](重复:标签",计数:10)覆盖func viewDidLoad(){super.viewDidLoad()view.addSubview(tableView)tableView.translatesAutoresizingMaskIntoConstraints = falseNSLayoutConstraint.activate([tableView.topAnchor.constraint(等于:view.safeAreaLayoutGuide.topAnchor),tableView.leadingAnchor.constraint(equalTo:view.leadingAnchor),tableView.bottomAnchor.constraint(等于:view.safeAreaLayoutGuide.bottomAnchor),tableView.trailingAnchor.constraint(等于:view.trailingAnchor)])tableView.reloadData()}公共惰性var tableView:UITableView = {令v = UITableView.init(frame:.zero)v.代表=自我v.dataSource =自我v.estimatedRowHeight = 44v.rowHeight = UITableViewAutomaticDimensionv.register(TableCell.self,forCellReuseIdentifier:"TableCell")返回v}()}扩展ViewController:UITableViewDelegate {}扩展ViewController:UITableViewDataSource {func tableView(_ tableView:UITableView,numberOfRowsInSection部分:Int)->诠释{返回list.count}func tableView(_ tableView:UITableView,cellForRowAt indexPath:IndexPath)->UITableViewCell {让cell = tableView.dequeueReusableCell(withIdentifier:"TableCell",for:indexPath)为!表格单元cell.label.text ="\(列表[indexPath.row])\(indexPath.row)"返回单元}}
TableCell:
TableCell类:UITableViewCell {需要初始化吗?(编码器aDecoder:NSCoder){super.init(编码器:aDecoder)commonInit()}覆盖init(样式:UITableViewCellStyle,复用标识符:字符串?){super.init(样式:样式,复用标识符:复用标识符)commonInit()}func commonInit(){contentView.addSubview(label)contentView.addSubview(collectionView)updateConstraints()}覆盖func updateConstraints(){label.translatesAutoresizingMaskIntoConstraints = falseNSLayoutConstraint.activate([label.topAnchor.constraint(equalTo:topAnchor),label.leadingAnchor.constraint(equalTo:LeadingAnchor),label.trailingAnchor.constraint(equalTo:railingAnchor)])collectionView.translatesAutoresizingMaskIntoConstraints = falseNSLayoutConstraint.activate([collectionView.topAnchor.constraint(equalTo:label.bottomAnchor),collectionView.leadingAnchor.constraint(equalTo:LeadingAnchor),collectionView.bottomAnchor.constraint(equalTo:bottomAnchor),collectionView.trailingAnchor.constraint(equalTo:railingAnchor),])super.updateConstraints()}let list = [String](重复:"Task_",计数:10)公开让标:UILabel = {令v = UILabel()v.textAlignment = .center返回v}()公共懒惰var collectionView:UICollectionView = {让布局= UICollectionViewFlowLayout()layout.minimumLineSpacing = 0layout.minimumInteritemSpacing = 0让v = UICollectionView(frame:.zero,collectionViewLayout:layout)v.register(CollectionCell.self,forCellWithReuseIdentifier:"CollectionCell")v.代表=自我v.dataSource =自我v.isScrollEnabled = false返回v}()覆盖func sizeThatFits(_ size:CGSize)->CGSize {让collectionCellHeight = 50let rows = list.count/5//5:每行项目let labelHeight = 20//您可以计算字符串高度让高度= CGFloat((collectionCellHeight *行)+ labelHeight)让width = contentView.frame.size.width返回CGSize(width:width,height:height)}}扩展TableCell:UICollectionViewDataSource {func collectionView(_ collectionView:UICollectionView,numberOfItemsInSection部分:Int)->诠释{返回list.count}func collectionView(_ collectionView:UICollectionView,cellForItemAt indexPath:IndexPath)->UICollectionViewCell {让单元格= collectionView.dequeueReusableCell(withReuseIdentifier:"CollectionCell",for:indexPath)为!收集单元cell.label.text ="\(list [indexPath.item])\(indexPath.item)"返回单元}}扩展TableCell:UICollectionViewDelegate {}扩展TableCell:UICollectionViewDelegateFlowLayout {func collectionView(_ collectionView:UICollectionView,布局collectionViewLayout:UICollectionViewLayout,sizeForItemAt indexPath:IndexPath)->CGSize {返回CGSize(width:collectionView.frame.width/5,height:50)}}
CollectionCell
CollectionCell类:UICollectionViewCell {让填充:CGFloat = 5覆盖init(frame:CGRect){super.init(frame:框架)commonInit()}需要初始化吗?(编码器aDecoder:NSCoder){super.init(编码器:aDecoder)commonInit()}func commonInit(){backgroundColor = .yellowcontentView.addSubview(label)updateConstraints()}覆盖func updateConstraints(){label.translatesAutoresizingMaskIntoConstraints = falseNSLayoutConstraint.activate([label.topAnchor.constraint(equalTo:topAnchor,常数:padding),label.leadingAnchor.constraint(equalTo:LeadingAnchor,常数:padding),label.trailingAnchor.constraint(equalTo:railingAnchor,常数:-padding),label.bottomAnchor.constraint(equalTo:bottomAnchor,常数:-padding)])super.updateConstraints()}公开让标:UILabel = {令v = UILabel()v.textColor = .darkTextv.minimumScaleFactor = 0.5v.numberOfLines = 1返回v}()}
For some reasons I cannot properly display some items from a collection inside an tableview cell when using Xcode 10 beta. I tried all I know for the last 4 days.
I made a small project sample to see what my issue is.
Full code is here if someone wants to run it locally: https://github.com/adrianstanciu24/CollectionViewInsideUITableViewCell
I first add an table view with 2 different resizable cells, first cell has the collection view and a label:
class ViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {
@IBOutlet weak var tableView: UITableView!
override func viewDidLoad() {
super.viewDidLoad()
tableView.delegate = self
tableView.dataSource = self
tableView.estimatedRowHeight = 44
tableView.rowHeight = UITableView.automaticDimension
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return 2
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
if indexPath.row == 0 {
let cell = tableView.dequeueReusableCell(withIdentifier: "collCell") as! CollectionTableViewCell
cell.collectionView.collectionViewLayout.invalidateLayout()
return cell
} else {
let cell = tableView.dequeueReusableCell(withIdentifier: "normalCell")!
return cell
}
}
}
Here is the cell with collection view defined. This also has a height constraint which I updated in layoutSubviews
:
class CollectionTableViewCell: UITableViewCell, UICollectionViewDataSource, UICollectionViewDelegateFlowLayout, UICollectionViewDelegate {
@IBOutlet weak var collectionView: UICollectionView!
@IBOutlet weak var collectionViewHeightConstraint: NSLayoutConstraint!
override func awakeFromNib() {
super.awakeFromNib()
collectionView.delegate = self
collectionView.dataSource = self
if let layout = collectionView.collectionViewLayout as? UICollectionViewFlowLayout {
layout.estimatedItemSize = UICollectionViewFlowLayout.automaticSize
}
}
override func layoutSubviews() {
super.layoutSubviews()
collectionViewHeightConstraint.constant = collectionView.collectionViewLayout.collectionViewContentSize.height
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return 10
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "taskCell", for: indexPath as IndexPath) as! TaskCollectionViewCell
cell.name.text = "Task_" + String(indexPath.row)
return cell
}
}
Below is a screenshot with the collection view constraint and how the storyboard looks:
And this is how it looks when running:
The cells are squashed and label on top disappears. What I want is the collection view should grow to show all elements and also making table view cell to resize, but that is not happening at the moment and I can't figure out where the issue is.
If you want the following output:
Code ViewController:
class ViewController: UIViewController {
let list = [String](repeating: "Label", count: 10)
override func viewDidLoad() {
super.viewDidLoad()
view.addSubview(tableView)
tableView.translatesAutoresizingMaskIntoConstraints = false
NSLayoutConstraint.activate([
tableView.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor),
tableView.leadingAnchor.constraint(equalTo: view.leadingAnchor),
tableView.bottomAnchor.constraint(equalTo: view.safeAreaLayoutGuide.bottomAnchor),
tableView.trailingAnchor.constraint(equalTo: view.trailingAnchor)
])
tableView.reloadData()
}
public lazy var tableView: UITableView = { [unowned self] in
let v = UITableView.init(frame: .zero)
v.delegate = self
v.dataSource = self
v.estimatedRowHeight = 44
v.rowHeight = UITableViewAutomaticDimension
v.register(TableCell.self, forCellReuseIdentifier: "TableCell")
return v
}()
}
extension ViewController: UITableViewDelegate{
}
extension ViewController: UITableViewDataSource{
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return list.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "TableCell", for: indexPath) as! TableCell
cell.label.text = "\(list[indexPath.row]) \(indexPath.row)"
return cell
}
}
TableCell:
class TableCell: UITableViewCell{
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
commonInit()
}
override init(style: UITableViewCellStyle, reuseIdentifier: String?) {
super.init(style: style, reuseIdentifier: reuseIdentifier)
commonInit()
}
func commonInit(){
contentView.addSubview(label)
contentView.addSubview(collectionView)
updateConstraints()
}
override func updateConstraints() {
label.translatesAutoresizingMaskIntoConstraints = false
NSLayoutConstraint.activate([
label.topAnchor.constraint(equalTo: topAnchor),
label.leadingAnchor.constraint(equalTo: leadingAnchor),
label.trailingAnchor.constraint(equalTo: trailingAnchor)
])
collectionView.translatesAutoresizingMaskIntoConstraints = false
NSLayoutConstraint.activate([
collectionView.topAnchor.constraint(equalTo: label.bottomAnchor),
collectionView.leadingAnchor.constraint(equalTo: leadingAnchor),
collectionView.bottomAnchor.constraint(equalTo: bottomAnchor),
collectionView.trailingAnchor.constraint(equalTo: trailingAnchor),
])
super.updateConstraints()
}
let list = [String](repeating: "Task_", count: 10)
public let label: UILabel = {
let v = UILabel()
v.textAlignment = .center
return v
}()
public lazy var collectionView: UICollectionView = { [unowned self] in
let layout = UICollectionViewFlowLayout()
layout.minimumLineSpacing = 0
layout.minimumInteritemSpacing = 0
let v = UICollectionView(frame: .zero, collectionViewLayout: layout)
v.register(CollectionCell.self, forCellWithReuseIdentifier: "CollectionCell")
v.delegate = self
v.dataSource = self
v.isScrollEnabled = false
return v
}()
override func sizeThatFits(_ size: CGSize) -> CGSize {
let collectionCellHeight = 50
let rows = list.count / 5 // 5: items per row
let labelHeight = 20 // you can calculate String height
let height = CGFloat((collectionCellHeight * rows) + labelHeight)
let width = contentView.frame.size.width
return CGSize(width: width, height: height)
}
}
extension TableCell: UICollectionViewDataSource{
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return list.count
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "CollectionCell", for: indexPath) as! CollectionCell
cell.label.text = "\(list[indexPath.item])\(indexPath.item)"
return cell
}
}
extension TableCell: UICollectionViewDelegate{
}
extension TableCell: UICollectionViewDelegateFlowLayout{
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
return CGSize(width: collectionView.frame.width/5, height: 50)
}
}
CollectionCell
class CollectionCell: UICollectionViewCell{
let padding: CGFloat = 5
override init(frame: CGRect) {
super.init(frame: frame)
commonInit()
}
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
commonInit()
}
func commonInit(){
backgroundColor = .yellow
contentView.addSubview(label)
updateConstraints()
}
override func updateConstraints() {
label.translatesAutoresizingMaskIntoConstraints = false
NSLayoutConstraint.activate([
label.topAnchor.constraint(equalTo: topAnchor, constant: padding),
label.leadingAnchor.constraint(equalTo: leadingAnchor, constant: padding),
label.trailingAnchor.constraint(equalTo: trailingAnchor, constant: -padding),
label.bottomAnchor.constraint(equalTo: bottomAnchor, constant: -padding)
])
super.updateConstraints()
}
public let label: UILabel = {
let v = UILabel()
v.textColor = .darkText
v.minimumScaleFactor = 0.5
v.numberOfLines = 1
return v
}()
}
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