我在 UITableViewCell 内滚动 UICollectionView 时遇到问题。
不幸的是，CollectionView 根本不滚动。当我尝试禁用其他 UITableViewCells 时，它可以正常工作，反之亦然。
集合视图单元格：
import UIKit
class CategoriesCollectionViewCell: UICollectionViewCell {
override init(frame: CGRect) {
super.init(frame: frame)
backgroundColor = .white
layoutUI()
}
required init(coder adecoder: NSCoder) {
fatalError("init(codeer:) has not been implemented")
}
lazy var categoriesImage: UIImageView = {
let categoriesImage = UIImageView()
categoriesImage.contentMode = .scaleToFill
categoriesImage.layer.cornerRadius = 8.0
categoriesImage.image = UIImage(named: "pizza")
categoriesImage.layer.cornerRadius = 8.0
categoriesImage.layer.masksToBounds = true
categoriesImage.translatesAutoresizingMaskIntoConstraints = false
return categoriesImage
}()
lazy var containerView: UIView = {
let containerView = UIView()
containerView.backgroundColor = .black
containerView.alpha = 0.7
containerView.translatesAutoresizingMaskIntoConstraints = false
return containerView
}()
lazy var categoryName: UILabel = {
let categoryName = UILabel()
categoryName.textColor = .white
categoryName.font = UIFont(name: "AvenirNext-DemiBold", size: 16)
categoryName.text = "Soup"
categoryName.textAlignment = .left
categoryName.translatesAutoresizingMaskIntoConstraints = false
return categoryName
}()
lazy var recipesNumber: UILabel = {
let recipesNumber = UILabel()
recipesNumber.textColor = .white
recipesNumber.font = UIFont(name: "AvenirNext-Regular", size: 16)
recipesNumber.text = "33"
recipesNumber.textAlignment = .left
recipesNumber.translatesAutoresizingMaskIntoConstraints = false
return recipesNumber
}()
func setupcategoriesImageConstraints() {
NSLayoutConstraint.activate([
categoriesImage.topAnchor.constraint(equalTo: topAnchor),
categoriesImage.bottomAnchor.constraint(equalTo: bottomAnchor),
categoriesImage.leadingAnchor.constraint(equalTo: leadingAnchor),
categoriesImage.trailingAnchor.constraint(equalTo: trailingAnchor),
])
}
func setupContainerViewConstraints() {
NSLayoutConstraint.activate([
containerView.topAnchor.constraint(equalTo: categoriesImage.topAnchor),
containerView.bottomAnchor.constraint(equalTo: categoriesImage.bottomAnchor),
containerView.leadingAnchor.constraint(equalTo: categoriesImage.leadingAnchor),
containerView.trailingAnchor.constraint(equalTo: categoriesImage.trailingAnchor)
])
}
func setupCategoryNameConstraints() {
NSLayoutConstraint.activate([
categoryName.topAnchor.constraint(equalTo: containerView.topAnchor, constant: 16),
categoryName.leadingAnchor.constraint(equalTo: containerView.leadingAnchor, constant: 16),
categoryName.trailingAnchor.constraint(equalTo: containerView.trailingAnchor, constant: 16)
])
}
func setuprecipesNumberConstraints() {
NSLayoutConstraint.activate([
recipesNumber.bottomAnchor.constraint(equalTo: containerView.bottomAnchor, constant: -16),
recipesNumber.leadingAnchor.constraint(equalTo: containerView.leadingAnchor, constant: 16),
recipesNumber.trailingAnchor.constraint(equalTo: containerView.trailingAnchor, constant: 16)
])
}
func addSubviews() {
addSubview(categoriesImage)
categoriesImage.addSubview(containerView)
containerView.addSubview(categoryName)
containerView.addSubview(recipesNumber)
}
func layoutUI() {
addSubviews()
setupcategoriesImageConstraints()
setupContainerViewConstraints()
setupCategoryNameConstraints()
setuprecipesNumberConstraints()
}
}
CollectionViewInTableViewCell：
import UIKit
class CategoriesTableViewCellCollectionViewCell: UITableViewCell, UICollectionViewDelegateFlowLayout {
let categories = ["italian food", "chinese food", "korean food", "italian food", "chinese food", "korean food", "italian food", "chinese food", "korean food", "italian food", "chinese food", "korean food"]
override init(style: UITableViewCell.CellStyle, reuseIdentifier: String?) {
super.init(style: style, reuseIdentifier: reuseIdentifier)
layoutUI()
selectionStyle = .none
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
lazy var containerView: UIView = {
let containerView = UIView()
containerView.backgroundColor = .clear
containerView.translatesAutoresizingMaskIntoConstraints = false
return containerView
}()
lazy var categoriesNameLabel: UILabel = {
let categoriesNameLabel = UILabel()
categoriesNameLabel.text = "Categories"
categoriesNameLabel.textColor = .customDarkGray()
categoriesNameLabel.textAlignment = .left
categoriesNameLabel.font = UIFont(name: "AvenirNext-Regular", size: 14)
categoriesNameLabel.translatesAutoresizingMaskIntoConstraints = false
return categoriesNameLabel
}()
lazy var seeAllCategoriesButton: UIButton = {
let seeAllCategoriesButton = UIButton()
seeAllCategoriesButton.setTitle("See all", for: .normal)
seeAllCategoriesButton.setTitleColor(.CustomGreen(), for: .normal)
seeAllCategoriesButton.titleLabel?.font = UIFont(name: "AvenirNext-Regular", size: 14)
seeAllCategoriesButton.translatesAutoresizingMaskIntoConstraints = false
seeAllCategoriesButton.addTarget(self, action: #selector(test), for: .touchUpInside)
return seeAllCategoriesButton
}()
@objc func test() {
print("Test worked")
}
lazy var collectionView: UICollectionView = {
let layout = UICollectionViewFlowLayout()
layout.scrollDirection = .horizontal
let collectionView = UICollectionView(frame: .zero, collectionViewLayout: layout)
collectionView.translatesAutoresizingMaskIntoConstraints = false
collectionView.backgroundColor = .clear
collectionView.showsHorizontalScrollIndicator = false
collectionView.delegate = self
collectionView.dataSource = self
collectionView.register(CategoriesCollectionViewCell.self, forCellWithReuseIdentifier: "CategoriesCollectionViewCell")
return collectionView
}()
func setupContainerViewConstraints() {
NSLayoutConstraint.activate([
containerView.topAnchor.constraint(equalTo: topAnchor, constant: 16),
containerView.leadingAnchor.constraint(equalTo: leadingAnchor, constant: 16),
containerView.trailingAnchor.constraint(equalTo: trailingAnchor, constant: -16),
containerView.heightAnchor.constraint(equalTo: categoriesNameLabel.heightAnchor)
])
}
func setupCategoriesNameLabelConstraints() {
NSLayoutConstraint.activate([
categoriesNameLabel.leadingAnchor.constraint(equalTo: containerView.leadingAnchor),
categoriesNameLabel.centerYAnchor.constraint(equalTo: containerView.centerYAnchor)
])
}
func setupSeeAllCategoriesButtonConstraints() {
NSLayoutConstraint.activate([
seeAllCategoriesButton.trailingAnchor.constraint(equalTo: containerView.trailingAnchor),
seeAllCategoriesButton.centerYAnchor.constraint(equalTo: containerView.centerYAnchor)
])
}
func setupCollectionViewConstraints() {
NSLayoutConstraint.activate([
collectionView.topAnchor.constraint(equalTo: categoriesNameLabel.topAnchor, constant: 16),
collectionView.bottomAnchor.constraint(equalTo: bottomAnchor, constant: 16),
collectionView.leadingAnchor.constraint(equalTo: leadingAnchor, constant: 16),
collectionView.trailingAnchor.constraint(equalTo: trailingAnchor, constant: -16),
])
}
func addSubviews() {
addSubview(categoriesNameLabel)
addSubview(containerView)
containerView.addSubview(seeAllCategoriesButton)
containerView.addSubview(collectionView)
}
func layoutUI() {
addSubviews()
setupCollectionViewConstraints()
setupContainerViewConstraints()
setupCategoriesNameLabelConstraints()
setupSeeAllCategoriesButtonConstraints()
}
}
extension CategoriesTableViewCellCollectionViewCell: UICollectionViewDelegate, UICollectionViewDataSource {
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return categories.count
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "CategoriesCollectionViewCell", for: indexPath) as! CategoriesCollectionViewCell
return cell
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
return CGSize(width: self.frame.width / 2, height: self.frame.width / 4)
}
}
表视图单元格：
import UIKit
class HomeTableViewCell: UITableViewCell {
override init(style: UITableViewCell.CellStyle, reuseIdentifier: String?) {
super.init(style: style, reuseIdentifier: reuseIdentifier)
layoutUI()
selectionStyle = .none
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
lazy var containerView: UIView = {
let containerView = UIView()
containerView.backgroundColor = .white
containerView.translatesAutoresizingMaskIntoConstraints = false
containerView.layer.shadowColor = UIColor.black.cgColor
containerView.layer.shadowOpacity = 1
containerView.layer.shadowOffset = .init(width: 2, height: 2)
containerView.layer.shadowRadius = 7.0
containerView.layer.cornerRadius = 8.0
// containerView.clipsToBounds = true
return containerView
}()
lazy var foodImage: UIImageView = {
let foodImage = UIImageView()
foodImage.translatesAutoresizingMaskIntoConstraints = false
foodImage.contentMode = .scaleAspectFill
foodImage.clipsToBounds = true
foodImage.layer.cornerRadius = 8.0
return foodImage
}()
lazy var foodTitle: UILabel = {
let foodTitle = UILabel()
foodTitle.textColor = .CustomGreen()
foodTitle.numberOfLines = 0
foodTitle.translatesAutoresizingMaskIntoConstraints = false
return foodTitle
}()
func setupContainerView() {
NSLayoutConstraint.activate([
containerView.topAnchor.constraint(equalTo: topAnchor, constant: 16),
containerView.bottomAnchor.constraint(equalTo: bottomAnchor, constant: -16),
containerView.leadingAnchor.constraint(equalTo: leadingAnchor, constant: 16),
containerView.trailingAnchor.constraint(equalTo: trailingAnchor, constant: -16),
])
}
func setupFoodImage() {
NSLayoutConstraint.activate([
foodImage.topAnchor.constraint(equalTo: containerView.topAnchor),
foodImage.leadingAnchor.constraint(equalTo: containerView.leadingAnchor),
foodImage.trailingAnchor.constraint(equalTo: containerView.trailingAnchor),
foodImage.heightAnchor.constraint(equalToConstant: 250)
])
}
func setupFoodTitle() {
NSLayoutConstraint.activate([
foodTitle.topAnchor.constraint(equalTo: foodImage.bottomAnchor, constant: 16),
foodTitle.bottomAnchor.constraint(equalTo: containerView.bottomAnchor, constant: -16),
foodTitle.leadingAnchor.constraint(equalTo: containerView.leadingAnchor, constant: 16),
foodTitle.trailingAnchor.constraint(equalTo: containerView.trailingAnchor, constant: -16)
])
}
func addSubview() {
addSubview(containerView)
containerView.addSubview(foodImage)
containerView.addSubview(foodTitle)
}
func layoutUI() {
addSubview()
setupContainerView()
setupFoodImage()
setupFoodTitle()
}
}
首页视图：
class HomeView: UIView {
var recipes: Recipes?
var recipesDetails = [Recipe]()
let indicator = ActivityIndicator()
override init( frame: CGRect) {
super.init(frame: frame)
layoutUI()
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
lazy var foodTableView: UITableView = {
let foodTableView = UITableView()
foodTableView.translatesAutoresizingMaskIntoConstraints = false
foodTableView.backgroundColor = .white
foodTableView.delegate = self
foodTableView.dataSource = self
foodTableView.register(CategoriesTableViewCellCollectionViewCell.self, forCellReuseIdentifier: "CategoriesTableViewCellCollectionViewCell")
foodTableView.register(HomeTableViewCell.self, forCellReuseIdentifier: "HomeTableViewCell")
foodTableView.rowHeight = UITableView.automaticDimension
// foodTableView.estimatedRowHeight = 100
foodTableView.showsVerticalScrollIndicator = false
foodTableView.separatorStyle = .none
return foodTableView
}()
func setupFoodTableView() {
NSLayoutConstraint.activate([
foodTableView.topAnchor.constraint(equalTo: topAnchor),
foodTableView.bottomAnchor.constraint(equalTo: bottomAnchor),
foodTableView.leadingAnchor.constraint(equalTo: leadingAnchor),
foodTableView.trailingAnchor.constraint(equalTo: trailingAnchor)
])
}
func addSubview() {
addSubview(foodTableView)
}
func layoutUI() {
indicator.setupIndicatorView(self, containerColor: .customDarkGray(), indicatorColor: .white)
addSubview()
setupFoodTableView()
fetchData()
}
func fetchData() {
AF.request("https://api.url").responseJSON { (response) in
if let error = response.error {
print(error)
}
do {
self.recipes = try JSONDecoder().decode(Recipes.self, from: response.data!)
self.recipesDetails = self.recipes?.recipes ?? []
DispatchQueue.main.async {
self.foodTableView.reloadData()
}
} catch {
print(error)
}
self.indicator.hideIndicatorView()
}
}
}
extension HomeView: UITableViewDelegate, UITableViewDataSource {
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return recipesDetails.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
if indexPath.row == 0 {
let cell = tableView.dequeueReusableCell(withIdentifier: "CategoriesTableViewCellCollectionViewCell", for: indexPath) as! CategoriesTableViewCellCollectionViewCell
cell.layoutIfNeeded()
cell.collectionView.reloadData()
return cell
}
let cell = tableView.dequeueReusableCell(withIdentifier: "HomeTableViewCell", for: indexPath) as! HomeTableViewCell
let url = URL(string: recipesDetails[indexPath.row].image ?? "Error")
cell.foodImage.kf.setImage(with: url)
cell.foodTitle.text = recipesDetails[indexPath.row].title
cell.layoutIfNeeded()
return cell
}
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
if indexPath.row == 0 {
return 160
} else {
return 250
}
}
}
谁能告诉我出了什么问题或者我做错了什么？
Thanks.
