从 UICollection 1 更新 UICollection2 中的单元格内容
Update cell content in UICollection2 from UICollection 1
我有 3 个 UICollection。主 UICollection 包含 2 个单元格，每个单元格包含一个 UI Collection.
在第一个单元格中，从主 UICollection 加载了一个包含 3 个单元格的垂直 collection。
在第二个单元格中，从主 UICollection，创建了一个单元格 uicollection 视图。
见上图：UICollection主视图以黄色表示，2 个单元格分别由红色和蓝色表示。
第一个单元格（来自 uicollection 主视图）包含一个 uicollection 和 3 个单元格（红色）。当我点击（点击）位于红色 uicollection.[=18 中的任何（3 个）单元格时，我想更新蓝色 uicollection 视图单元格=]
FullScreenImage.swift
class FullScreenImage: UIViewController, UICollectionViewDelegate, UICollectionViewDelegateFlowLayout, UICollectionViewDataSource{
let bottomUIColletion: UICollectionView = {
let layout = UICollectionViewFlowLayout()
layout.minimumLineSpacing = 0
layout.minimumInteritemSpacing = 0
layout.scrollDirection = .horizontal
let cv = UICollectionView(frame: .zero, collectionViewLayout: layout)
return cv
}()
let bottomContentCell = "buttonContentCell"
let bottomButtonsCell = "buttonButtonsCell"
override func viewDidLoad() {
super.viewDidLoad()
self.bottomUIColletion.delegate = self
self.bottomUIColletion.dataSource = self
self.bottomUIColletion.register(BottomButtonsCollectionViewCell.self, forCellWithReuseIdentifier: bottomButtonsCell)
self.bottomUIColletion.register(BottomContentCollectionViewCell.self, forCellWithReuseIdentifier: bottomContentCell)
self.bottomUIColletion.translatesAutoresizingMaskIntoConstraints = false
self.view.addSubview(self.bottomUIColletion)
DispatchQueue.main.async {
self.bottomUIColletion.topAnchor.constraint(equalTo: self.bottomView.topAnchor, constant: 0).isActive = true
self.bottomUIColletion.leadingAnchor.constraint(equalTo: self.bottomView.leadingAnchor, constant: 0).isActive = true
self.bottomUIColletion.trailingAnchor.constraint(equalTo: self.bottomView.trailingAnchor, constant: 0).isActive = true
self.bottomUIColletion.heightAnchor.constraint(equalToConstant: self.bottomView.frame.height).isActive = true
}
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return 2
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
if indexPath.row == 0{
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: bottomButtonsCell, for: indexPath) as! BottomButtonsCollectionViewCell
return cell
}
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: bottomContentCell, for: indexPath) as! BottomContentCollectionViewCell
return cell
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
if indexPath.row == 0 {
return CGSize(width: 50, height: self.bottomUIColletion.frame.height)
}
return CGSize(width: self.bottomUIColletion.frame.width-50, height: self.bottomUIColletion.frame.height)
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAt section: Int) -> UIEdgeInsets {
return UIEdgeInsets(top: 0, left: 0, bottom: 0, right: 0)
}
}
BottomButtonsCollectionViewCell.swift
import UIKit
import FontAwesome_swift
class BottomButtonsCollectionViewCell: UICollectionViewCell, UICollectionViewDelegate, UICollectionViewDataSource, UICollectionViewDelegateFlowLayout {
override init(frame: CGRect) {
super.init(frame: frame)
setup()
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
let parentCollection = FullScreenImage()
let otherController = BottomContentCollectionViewCell()
let buttonCollection: UICollectionView = {
let layout = UICollectionViewFlowLayout()
layout.minimumLineSpacing = 0
layout.minimumInteritemSpacing = 0
layout.scrollDirection = .vertical
let cv = UICollectionView(frame: .zero, collectionViewLayout: layout)
cv.backgroundColor = UIColor.clear
return cv
}()
let buttonCell = "buttonCell"
func setup(){
buttonCollection.delegate = self
buttonCollection.dataSource = self
buttonCollection.register(ButtonLayout.self, forCellWithReuseIdentifier: buttonCell)
buttonCollection.translatesAutoresizingMaskIntoConstraints = false
addSubview(buttonCollection)
buttonCollection.leadingAnchor.constraint(equalTo: self.safeAreaLayoutGuide.leadingAnchor, constant: 0).isActive = true
buttonCollection.trailingAnchor.constraint(equalTo: self.safeAreaLayoutGuide.trailingAnchor, constant: 0).isActive = true
buttonCollection.topAnchor.constraint(equalTo: self.safeAreaLayoutGuide.topAnchor, constant: 0).isActive = true
buttonCollection.bottomAnchor.constraint(equalTo: self.safeAreaLayoutGuide.bottomAnchor, constant: 0).isActive = true
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return 3
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: buttonCell, for: indexPath) as! ButtonLayout
if indexPath.row == 0{
cell.actionBtn.setImage(UIImage(named: "font_size_icon_white"), for: .normal)
}else if indexPath.row == 1{
cell.actionBtn.titleLabel?.font = UIFont.fontAwesome(ofSize: 25, style: .solid )
cell.actionBtn.setTitle(String.fontAwesomeIcon(name: .font), for: .normal)
}else if indexPath.row == 2{
cell.actionBtn.titleLabel?.font = UIFont.fontAwesome(ofSize: 25, style: .solid )
cell.actionBtn.setTitle(String.fontAwesomeIcon(name: .palette), for: .normal)
}
return cell
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
return CGSize(width: self.frame.width, height: self.frame.height / 3)
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAt section: Int) -> UIEdgeInsets {
return UIEdgeInsets(top: 0, left: 0, bottom: 0, right: 0)
}
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
otherController.btnSelected = indexPath.row
parentCollection.bottomUIColletion.reloadItems(at: parentCollection.bottomUIColletion.indexPathsForVisibleItems)
parentCollection.bottomUIColletion.reloadData()
parentCollection.bottomUIColletion.layoutIfNeeded()
//parentCollection.bottomUIColletion.
}
}
class ButtonLayout: UICollectionViewCell{
override init(frame: CGRect) {
super.init(frame:frame)
setupCell()
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
let actionBtn = UIButton()
func setupCell(){
backgroundColor = UIColor.darkGray
actionBtn.translatesAutoresizingMaskIntoConstraints = false
addSubview(actionBtn)
actionBtn.leadingAnchor.constraint(equalTo: self.safeAreaLayoutGuide.leadingAnchor, constant: 10).isActive = true
actionBtn.trailingAnchor.constraint(equalTo: self.safeAreaLayoutGuide.trailingAnchor, constant: -10).isActive = true
actionBtn.topAnchor.constraint(equalTo: self.safeAreaLayoutGuide.topAnchor, constant: 10).isActive = true
actionBtn.bottomAnchor.constraint(equalTo: self.safeAreaLayoutGuide.bottomAnchor, constant: -10).isActive = true
}
}
BottomContentCollectionViewCell.swift
import UIKit
class BottomContentCollectionViewCell: UICollectionViewCell, UICollectionViewDelegate, UICollectionViewDataSource, UICollectionViewDelegateFlowLayout{
var btnSelected = Int()
let contentCollection: UICollectionView = {
let layout = UICollectionViewFlowLayout()
layout.minimumLineSpacing = 0
layout.minimumInteritemSpacing = 0
layout.scrollDirection = .vertical
let cv = UICollectionView(frame: .zero, collectionViewLayout: layout)
cv.backgroundColor = UIColor.clear
return cv
}()
let textCell = "textSizeCell"
let fontTypeCell = "fontCell"
let backgroundColorCell = "backgroundCell"
let defaultCellLayout = "defaultCellLayout"
override init(frame: CGRect) {
super.init(frame: frame)
setup()
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
func setup(){
contentCollection.delegate = self
contentCollection.dataSource = self
contentCollection.register(textSizeCell.self, forCellWithReuseIdentifier: textCell)
contentCollection.register(fontCell.self, forCellWithReuseIdentifier: fontTypeCell)
contentCollection.register(BackgroundContentCollectionViewCell.self, forCellWithReuseIdentifier: backgroundColorCell)
contentCollection.register(defaultCell.self, forCellWithReuseIdentifier: defaultCellLayout)
contentCollection.translatesAutoresizingMaskIntoConstraints = false
addSubview(contentCollection)
contentCollection.leadingAnchor.constraint(equalTo: self.safeAreaLayoutGuide.leadingAnchor, constant: 0).isActive = true
contentCollection.trailingAnchor.constraint(equalTo: self.safeAreaLayoutGuide.trailingAnchor, constant: 0).isActive = true
contentCollection.topAnchor.constraint(equalTo: self.safeAreaLayoutGuide.topAnchor, constant: 0).isActive = true
contentCollection.bottomAnchor.constraint(equalTo: self.safeAreaLayoutGuide.bottomAnchor, constant: 0).isActive = true
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return 1
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
print("Button Content Collection: \(btnSelected)")
//var cell = UICollectionViewCell()
switch btnSelected {
case 0:
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: textCell, for: indexPath) as! textSizeCell
print("I was called: textSizeCell viewcell")
return cell
case 1:
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: fontTypeCell, for: indexPath) as! fontCell
cell.nameLabel.text = "Awe"
print("I was called: fontcell viewcell")
return cell
case 2:
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: backgroundColorCell, for: indexPath) as! BackgroundContentCollectionViewCell
print("I was called: backgroundCell viewcell")
return cell
default:
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: defaultCellLayout, for: indexPath) as! defaultCell
print("I was called: defaultCell viewcell")
return cell
}
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
return CGSize(width: self.frame.width, height: self.frame.height)
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAt section: Int) -> UIEdgeInsets {
return UIEdgeInsets(top: 0, left: 0, bottom: 0, right: 0)
}
}
class textSizeCell: UICollectionViewCell{
override init(frame: CGRect) {
super.init(frame:frame)
setupCell()
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func prepareForReuse() {
super.prepareForReuse()
}
func setupCell(){
backgroundColor = UIColor.purple
print("textSizeCell called.")
}
}
class fontCell: UICollectionViewCell{
override init(frame: CGRect) {
super.init(frame:frame)
setupCell()
}
override func prepareForReuse() {
super.prepareForReuse()
}
let nameLabel: UILabel = {
let label = UILabel()
label.textAlignment = .center
//label.adjustsFontSizeToFitWidth = true
//label.minimumScaleFactor = 0.5
label.font = label.font.withSize(10)
label.textColor = UIColor.lightGray
label.numberOfLines = 0
label.translatesAutoresizingMaskIntoConstraints = false
return label
}()
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
func setupCell(){
self.backgroundColor = UIColor.yellow
addSubview(nameLabel)
nameLabel.centerXAnchor.constraint(equalTo: self.safeAreaLayoutGuide.centerXAnchor, constant: 0).isActive = true
nameLabel.centerYAnchor.constraint(equalTo: self.safeAreaLayoutGuide.centerYAnchor, constant: 0).isActive = true
nameLabel.heightAnchor.constraint(equalToConstant: 40)
print("Font Cell setupCell called.")
}
}
class defaultCell: UICollectionViewCell{
override init(frame: CGRect) {
super.init(frame:frame)
setupCell()
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func prepareForReuse() {
super.prepareForReuse()
}
func setupCell(){
backgroundColor = UIColor.white
}
}
我一直在尝试根据 didSelectItemAt 在 BottomButtonsCollectionViewCell.swift 中选择的单元格重新加载单元格内容，然后重新加载数据，但我没有运气。当 运行 应用程序时，不会重新加载。
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
otherController.btnSelected = indexPath.row
parentCollection.bottomUIColletion.reloadItems(at: parentCollection.bottomUIColletion.indexPathsForVisibleItems)
parentCollection.bottomUIColletion.reloadData()
parentCollection.bottomUIColletion.layoutIfNeeded()
//parentCollection.bottomUIColletion.
}
我错过了什么吗？我已经为此工作了 2 天，我感到不知所措，还有点沮丧。另外，我可能忽略了 SO 中的任何类似问题。如果是这样，请指出正确的方向。
我真的希望我在这里解释了自己。感谢您的意见。
您创建了一个名为 RedCollectionViewDelegate 的委托，它将定义 didSelect(cell) 函数。
在您的 RedCollectionView
中定义一个变量 weak var delegate : RedCollectionViewDelegate
当您设置主集合视图时，您将可以访问 RedCollectionView 和 BlueCollectionView。让委托成为主 collectionView 或 BlueCollection 或两者。这完全取决于您。
然后定义函数，想干什么就干什么。
我有 3 个 UICollection。主 UICollection 包含 2 个单元格，每个单元格包含一个 UI Collection.
在第一个单元格中，从主 UICollection 加载了一个包含 3 个单元格的垂直 collection。
在第二个单元格中，从主 UICollection，创建了一个单元格 uicollection 视图。
见上图：UICollection主视图以黄色表示，2 个单元格分别由红色和蓝色表示。
第一个单元格（来自 uicollection 主视图）包含一个 uicollection 和 3 个单元格（红色）。当我点击（点击）位于红色 uicollection.[=18 中的任何（3 个）单元格时，我想更新蓝色 uicollection 视图单元格=]
FullScreenImage.swift
class FullScreenImage: UIViewController, UICollectionViewDelegate, UICollectionViewDelegateFlowLayout, UICollectionViewDataSource{
let bottomUIColletion: UICollectionView = {
let layout = UICollectionViewFlowLayout()
layout.minimumLineSpacing = 0
layout.minimumInteritemSpacing = 0
layout.scrollDirection = .horizontal
let cv = UICollectionView(frame: .zero, collectionViewLayout: layout)
return cv
}()
let bottomContentCell = "buttonContentCell"
let bottomButtonsCell = "buttonButtonsCell"
override func viewDidLoad() {
super.viewDidLoad()
self.bottomUIColletion.delegate = self
self.bottomUIColletion.dataSource = self
self.bottomUIColletion.register(BottomButtonsCollectionViewCell.self, forCellWithReuseIdentifier: bottomButtonsCell)
self.bottomUIColletion.register(BottomContentCollectionViewCell.self, forCellWithReuseIdentifier: bottomContentCell)
self.bottomUIColletion.translatesAutoresizingMaskIntoConstraints = false
self.view.addSubview(self.bottomUIColletion)
DispatchQueue.main.async {
self.bottomUIColletion.topAnchor.constraint(equalTo: self.bottomView.topAnchor, constant: 0).isActive = true
self.bottomUIColletion.leadingAnchor.constraint(equalTo: self.bottomView.leadingAnchor, constant: 0).isActive = true
self.bottomUIColletion.trailingAnchor.constraint(equalTo: self.bottomView.trailingAnchor, constant: 0).isActive = true
self.bottomUIColletion.heightAnchor.constraint(equalToConstant: self.bottomView.frame.height).isActive = true
}
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return 2
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
if indexPath.row == 0{
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: bottomButtonsCell, for: indexPath) as! BottomButtonsCollectionViewCell
return cell
}
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: bottomContentCell, for: indexPath) as! BottomContentCollectionViewCell
return cell
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
if indexPath.row == 0 {
return CGSize(width: 50, height: self.bottomUIColletion.frame.height)
}
return CGSize(width: self.bottomUIColletion.frame.width-50, height: self.bottomUIColletion.frame.height)
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAt section: Int) -> UIEdgeInsets {
return UIEdgeInsets(top: 0, left: 0, bottom: 0, right: 0)
}
}
BottomButtonsCollectionViewCell.swift
import UIKit
import FontAwesome_swift
class BottomButtonsCollectionViewCell: UICollectionViewCell, UICollectionViewDelegate, UICollectionViewDataSource, UICollectionViewDelegateFlowLayout {
override init(frame: CGRect) {
super.init(frame: frame)
setup()
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
let parentCollection = FullScreenImage()
let otherController = BottomContentCollectionViewCell()
let buttonCollection: UICollectionView = {
let layout = UICollectionViewFlowLayout()
layout.minimumLineSpacing = 0
layout.minimumInteritemSpacing = 0
layout.scrollDirection = .vertical
let cv = UICollectionView(frame: .zero, collectionViewLayout: layout)
cv.backgroundColor = UIColor.clear
return cv
}()
let buttonCell = "buttonCell"
func setup(){
buttonCollection.delegate = self
buttonCollection.dataSource = self
buttonCollection.register(ButtonLayout.self, forCellWithReuseIdentifier: buttonCell)
buttonCollection.translatesAutoresizingMaskIntoConstraints = false
addSubview(buttonCollection)
buttonCollection.leadingAnchor.constraint(equalTo: self.safeAreaLayoutGuide.leadingAnchor, constant: 0).isActive = true
buttonCollection.trailingAnchor.constraint(equalTo: self.safeAreaLayoutGuide.trailingAnchor, constant: 0).isActive = true
buttonCollection.topAnchor.constraint(equalTo: self.safeAreaLayoutGuide.topAnchor, constant: 0).isActive = true
buttonCollection.bottomAnchor.constraint(equalTo: self.safeAreaLayoutGuide.bottomAnchor, constant: 0).isActive = true
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return 3
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: buttonCell, for: indexPath) as! ButtonLayout
if indexPath.row == 0{
cell.actionBtn.setImage(UIImage(named: "font_size_icon_white"), for: .normal)
}else if indexPath.row == 1{
cell.actionBtn.titleLabel?.font = UIFont.fontAwesome(ofSize: 25, style: .solid )
cell.actionBtn.setTitle(String.fontAwesomeIcon(name: .font), for: .normal)
}else if indexPath.row == 2{
cell.actionBtn.titleLabel?.font = UIFont.fontAwesome(ofSize: 25, style: .solid )
cell.actionBtn.setTitle(String.fontAwesomeIcon(name: .palette), for: .normal)
}
return cell
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
return CGSize(width: self.frame.width, height: self.frame.height / 3)
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAt section: Int) -> UIEdgeInsets {
return UIEdgeInsets(top: 0, left: 0, bottom: 0, right: 0)
}
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
otherController.btnSelected = indexPath.row
parentCollection.bottomUIColletion.reloadItems(at: parentCollection.bottomUIColletion.indexPathsForVisibleItems)
parentCollection.bottomUIColletion.reloadData()
parentCollection.bottomUIColletion.layoutIfNeeded()
//parentCollection.bottomUIColletion.
}
}
class ButtonLayout: UICollectionViewCell{
override init(frame: CGRect) {
super.init(frame:frame)
setupCell()
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
let actionBtn = UIButton()
func setupCell(){
backgroundColor = UIColor.darkGray
actionBtn.translatesAutoresizingMaskIntoConstraints = false
addSubview(actionBtn)
actionBtn.leadingAnchor.constraint(equalTo: self.safeAreaLayoutGuide.leadingAnchor, constant: 10).isActive = true
actionBtn.trailingAnchor.constraint(equalTo: self.safeAreaLayoutGuide.trailingAnchor, constant: -10).isActive = true
actionBtn.topAnchor.constraint(equalTo: self.safeAreaLayoutGuide.topAnchor, constant: 10).isActive = true
actionBtn.bottomAnchor.constraint(equalTo: self.safeAreaLayoutGuide.bottomAnchor, constant: -10).isActive = true
}
}
BottomContentCollectionViewCell.swift
import UIKit
class BottomContentCollectionViewCell: UICollectionViewCell, UICollectionViewDelegate, UICollectionViewDataSource, UICollectionViewDelegateFlowLayout{
var btnSelected = Int()
let contentCollection: UICollectionView = {
let layout = UICollectionViewFlowLayout()
layout.minimumLineSpacing = 0
layout.minimumInteritemSpacing = 0
layout.scrollDirection = .vertical
let cv = UICollectionView(frame: .zero, collectionViewLayout: layout)
cv.backgroundColor = UIColor.clear
return cv
}()
let textCell = "textSizeCell"
let fontTypeCell = "fontCell"
let backgroundColorCell = "backgroundCell"
let defaultCellLayout = "defaultCellLayout"
override init(frame: CGRect) {
super.init(frame: frame)
setup()
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
func setup(){
contentCollection.delegate = self
contentCollection.dataSource = self
contentCollection.register(textSizeCell.self, forCellWithReuseIdentifier: textCell)
contentCollection.register(fontCell.self, forCellWithReuseIdentifier: fontTypeCell)
contentCollection.register(BackgroundContentCollectionViewCell.self, forCellWithReuseIdentifier: backgroundColorCell)
contentCollection.register(defaultCell.self, forCellWithReuseIdentifier: defaultCellLayout)
contentCollection.translatesAutoresizingMaskIntoConstraints = false
addSubview(contentCollection)
contentCollection.leadingAnchor.constraint(equalTo: self.safeAreaLayoutGuide.leadingAnchor, constant: 0).isActive = true
contentCollection.trailingAnchor.constraint(equalTo: self.safeAreaLayoutGuide.trailingAnchor, constant: 0).isActive = true
contentCollection.topAnchor.constraint(equalTo: self.safeAreaLayoutGuide.topAnchor, constant: 0).isActive = true
contentCollection.bottomAnchor.constraint(equalTo: self.safeAreaLayoutGuide.bottomAnchor, constant: 0).isActive = true
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return 1
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
print("Button Content Collection: \(btnSelected)")
//var cell = UICollectionViewCell()
switch btnSelected {
case 0:
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: textCell, for: indexPath) as! textSizeCell
print("I was called: textSizeCell viewcell")
return cell
case 1:
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: fontTypeCell, for: indexPath) as! fontCell
cell.nameLabel.text = "Awe"
print("I was called: fontcell viewcell")
return cell
case 2:
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: backgroundColorCell, for: indexPath) as! BackgroundContentCollectionViewCell
print("I was called: backgroundCell viewcell")
return cell
default:
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: defaultCellLayout, for: indexPath) as! defaultCell
print("I was called: defaultCell viewcell")
return cell
}
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
return CGSize(width: self.frame.width, height: self.frame.height)
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAt section: Int) -> UIEdgeInsets {
return UIEdgeInsets(top: 0, left: 0, bottom: 0, right: 0)
}
}
class textSizeCell: UICollectionViewCell{
override init(frame: CGRect) {
super.init(frame:frame)
setupCell()
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func prepareForReuse() {
super.prepareForReuse()
}
func setupCell(){
backgroundColor = UIColor.purple
print("textSizeCell called.")
}
}
class fontCell: UICollectionViewCell{
override init(frame: CGRect) {
super.init(frame:frame)
setupCell()
}
override func prepareForReuse() {
super.prepareForReuse()
}
let nameLabel: UILabel = {
let label = UILabel()
label.textAlignment = .center
//label.adjustsFontSizeToFitWidth = true
//label.minimumScaleFactor = 0.5
label.font = label.font.withSize(10)
label.textColor = UIColor.lightGray
label.numberOfLines = 0
label.translatesAutoresizingMaskIntoConstraints = false
return label
}()
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
func setupCell(){
self.backgroundColor = UIColor.yellow
addSubview(nameLabel)
nameLabel.centerXAnchor.constraint(equalTo: self.safeAreaLayoutGuide.centerXAnchor, constant: 0).isActive = true
nameLabel.centerYAnchor.constraint(equalTo: self.safeAreaLayoutGuide.centerYAnchor, constant: 0).isActive = true
nameLabel.heightAnchor.constraint(equalToConstant: 40)
print("Font Cell setupCell called.")
}
}
class defaultCell: UICollectionViewCell{
override init(frame: CGRect) {
super.init(frame:frame)
setupCell()
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func prepareForReuse() {
super.prepareForReuse()
}
func setupCell(){
backgroundColor = UIColor.white
}
}
我一直在尝试根据 didSelectItemAt 在 BottomButtonsCollectionViewCell.swift 中选择的单元格重新加载单元格内容，然后重新加载数据，但我没有运气。当 运行 应用程序时，不会重新加载。
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
otherController.btnSelected = indexPath.row
parentCollection.bottomUIColletion.reloadItems(at: parentCollection.bottomUIColletion.indexPathsForVisibleItems)
parentCollection.bottomUIColletion.reloadData()
parentCollection.bottomUIColletion.layoutIfNeeded()
//parentCollection.bottomUIColletion.
}
我错过了什么吗？我已经为此工作了 2 天，我感到不知所措，还有点沮丧。另外，我可能忽略了 SO 中的任何类似问题。如果是这样，请指出正确的方向。
我真的希望我在这里解释了自己。感谢您的意见。
您创建了一个名为 RedCollectionViewDelegate 的委托，它将定义 didSelect(cell) 函数。
在您的 RedCollectionView
中定义一个变量weak var delegate : RedCollectionViewDelegate
当您设置主集合视图时，您将可以访问 RedCollectionView 和 BlueCollectionView。让委托成为主 collectionView 或 BlueCollection 或两者。这完全取决于您。
然后定义函数，想干什么就干什么。