swift - 如何在子类中使用新的 collectionView?
问题描述
我有一个 baseController,我在其中设置了一个 topView。在那个 topView 中,我使用了一个UICollectionView
命名的BaseCollectionViewCell
. 现在我有一个名为的新 ViewControllerHomeViewController
是BaseViewController
. 我需要一个新的collectionView HomeVC
,所以我创建了一个UICollectionViewCell
名为的新类HomeCollectionViewCell
,但是现在当我尝试使用它时,应用程序崩溃并显示以下错误:
无法将“MyApplicationName.BaseCollectionViewCell”类型的值转换为“MyApplicationName.HomeCollectionViewCell”
如何在HomeVC
课堂上使用新的 collectionView?任何帮助,将不胜感激。
BaseViewController
import UIKit
import WebKit
class BaseViewController: UIViewController {
let containerView: UIView = {
let v = UIView()
v.translatesAutoresizingMaskIntoConstraints = false
return v
}()
let topView:UIView = {
let v = UIView()
v.translatesAutoresizingMaskIntoConstraints = false
v.backgroundColor = .navRedColor
v.layer.cornerRadius = 45
v.layer.maskedCorners = [.layerMaxXMaxYCorner]
return v
}()
var searchBarView:UIView = {
let v = UIView()
v.translatesAutoresizingMaskIntoConstraints = false
v.backgroundColor = .white
v.layer.cornerRadius = 10
return v
}()
var searchTextField: UITextField = {
let fld = UITextField()
fld.translatesAutoresizingMaskIntoConstraints = false
fld.placeholder = "Search Movie here"
fld.textColor = .black
fld.backgroundColor = .white
fld.layer.cornerRadius = 10
return fld
}()
var searchIconImageView: UIImageView = {
let v = UIImageView()
v.translatesAutoresizingMaskIntoConstraints = false
v.image = #imageLiteral(resourceName: "searchIcon")
return v
}()
var movieChoiceLabel: UILabel = {
let lbl = UILabel()
lbl.translatesAutoresizingMaskIntoConstraints = false
lbl.text = "Movies of your\nchoice"
lbl.numberOfLines = 0
lbl.font = UIFont.systemFont(ofSize: 32, weight: .bold)
lbl.textColor = .white
let attrbText = NSMutableAttributedString(string: lbl.text!)
let range = (lbl.text! as NSString).range(of: "choice")
attrbText.addAttribute(NSAttributedString.Key.foregroundColor, value: UIColor.white.cgColor, range: range)
lbl.attributedText = attrbText
lbl.isUserInteractionEnabled = true
return lbl
}()
var profileImageView: UIImageView = {
let v = UIImageView()
v.translatesAutoresizingMaskIntoConstraints = false
v.layer.cornerRadius = 25
v.image = #imageLiteral(resourceName: "profileImage")
v.clipsToBounds = true
return v
}()
lazy var movieStatusCollectionView : UICollectionView = {
let layout = UICollectionViewFlowLayout()
let collectionView = UICollectionView(frame: .zero, collectionViewLayout: layout)
collectionView.translatesAutoresizingMaskIntoConstraints = false
collectionView.backgroundColor = .navRedColor
collectionView.delegate = self
collectionView.dataSource = self
return collectionView
}()
let collections = ["Latest", "Trending", "Upcoming"]
let collectionViewCellID = "cellID"
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = .white
self.navigationController?.navigationBar.isTranslucent = false
self.navigationController?.changeStatusBarColor(color: .navRedColor)
movieStatusCollectionView.register(BaseCollectionViewCell.self, forCellWithReuseIdentifier: collectionViewCellID)
setupViews()
movieChoiceLabel.addGestureRecognizer(UITapGestureRecognizer(target:self, action: #selector(tapLabel(gesture:))))
}
func setupViews() {
//AddSubviews
view.addSubview(containerView)
containerView.addSubview(topView)
topView.addSubview(searchBarView)
topView.addSubview(searchTextField)
searchBarView.addSubview(searchIconImageView)
topView.addSubview(movieChoiceLabel)
topView.addSubview(profileImageView)
topView.addSubview(movieStatusCollectionView)
//Constraints
NSLayoutConstraint.activate([
//ContainerView
containerView.leadingAnchor.constraint(equalTo: view.leadingAnchor),
containerView.trailingAnchor.constraint(equalTo: view.trailingAnchor),
containerView.topAnchor.constraint(equalTo: view.topAnchor),
containerView.bottomAnchor.constraint(equalTo: view.bottomAnchor),
//TopView
topView.leadingAnchor.constraint(equalTo: containerView.leadingAnchor),
topView.trailingAnchor.constraint(equalTo: containerView.trailingAnchor),
topView.topAnchor.constraint(equalTo: containerView.topAnchor, constant: 0),
topView.heightAnchor.constraint(equalToConstant: 256),
//SearchBarView
searchBarView.leadingAnchor.constraint(equalTo: topView.leadingAnchor, constant: 20),
searchBarView.trailingAnchor.constraint(equalTo: topView.trailingAnchor, constant: -20),
searchBarView.topAnchor.constraint(equalTo: topView.topAnchor),
searchBarView.heightAnchor.constraint(equalToConstant: 46),
//SearchIconImageView
searchIconImageView.leadingAnchor.constraint(equalTo: searchBarView.leadingAnchor, constant: 20),
searchIconImageView.centerYAnchor.constraint(equalTo: searchBarView.centerYAnchor),
searchIconImageView.widthAnchor.constraint(equalToConstant: 24),
searchIconImageView.heightAnchor.constraint(equalToConstant: 24),
//SearchTextField
searchTextField.leadingAnchor.constraint(equalTo: searchIconImageView.trailingAnchor, constant: 15),
searchTextField.trailingAnchor.constraint(equalTo: searchBarView.trailingAnchor),
searchTextField.topAnchor.constraint(equalTo: searchBarView.topAnchor),
searchTextField.bottomAnchor.constraint(equalTo: searchBarView.bottomAnchor),
//MovieChoiceLabel
movieChoiceLabel.leadingAnchor.constraint(equalTo: searchBarView.leadingAnchor),
movieChoiceLabel.trailingAnchor.constraint(equalTo: view.centerXAnchor, constant: 50),
movieChoiceLabel.topAnchor.constraint(equalTo: searchBarView.bottomAnchor, constant: 24),
//ProfileImageView
profileImageView.trailingAnchor.constraint(equalTo: searchBarView.trailingAnchor),
profileImageView.topAnchor.constraint(equalTo: searchBarView.bottomAnchor, constant: 24),
profileImageView.widthAnchor.constraint(equalToConstant: 50),
profileImageView.heightAnchor.constraint(equalToConstant: 50),
//MovieCollectionView
movieStatusCollectionView.leadingAnchor.constraint(equalTo: topView.leadingAnchor, constant: 28),
movieStatusCollectionView.trailingAnchor.constraint(equalTo: topView.trailingAnchor, constant: -28),
movieStatusCollectionView.topAnchor.constraint(equalTo: movieChoiceLabel.bottomAnchor, constant: 24),
movieStatusCollectionView.bottomAnchor.constraint(equalTo: topView.bottomAnchor, constant: -10),
])
}
extension BaseViewController: UICollectionViewDelegate, UICollectionViewDataSource, UICollectionViewDelegateFlowLayout {
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return 3
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: collectionViewCellID, for: indexPath) as! BaseCollectionViewCell
cell.headinLabel.text = collections[indexPath.item]
if indexPath.item == 0 {
cell.separatorLine.isHidden = false
}
return cell
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
return CGSize(width: 90, height: 30)
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAt section: Int) -> UIEdgeInsets {
return UIEdgeInsets(top: (collectionView.frame.height / 2) , left: -2, bottom: 0, right: 12)
}
}
HomeViewController
import UIKit
class HomeViewController: BaseViewController {
var topTrendingLabel: UILabel = {
let lbl = UILabel()
lbl.translatesAutoresizingMaskIntoConstraints = false
lbl.text = "Top Trendings"
lbl.textColor = .black
lbl.font = UIFont.systemFont(ofSize: 20, weight: .medium)
return lbl
}()
lazy var collectionView: UICollectionView = {
let layout = UICollectionViewFlowLayout()
let v = UICollectionView(frame: .zero, collectionViewLayout: layout)
v.translatesAutoresizingMaskIntoConstraints = false
v.delegate = self
v.dataSource = self
return v
}()
var topTrendings: [TrendingMovies] = {
let movie1 = TrendingMovies(imageName: "badboys", movieName: "Bad Boys")
let movie2 = TrendingMovies(imageName: "angrymen", movieName: "12 Angry Men")
return [movie1, movie2]
}()
let collectionCellID = "cellID"
override func viewDidLoad() {
super.viewDidLoad()
self.collectionView.register(HomeCollectionViewCell.self, forCellWithReuseIdentifier: collectionCellID)
}
override func setupViews() {
super.setupViews()
containerView.addSubview(topTrendingLabel)
containerView.addSubview(collectionView)
NSLayoutConstraint.activate([
//TopTrending
topTrendingLabel.leadingAnchor.constraint(equalTo: containerView.leadingAnchor, constant: 20),
topTrendingLabel.topAnchor.constraint(equalTo: topView.bottomAnchor, constant: 24),
//CollectionView
collectionView.leadingAnchor.constraint(equalTo: topTrendingLabel.leadingAnchor),
collectionView.trailingAnchor.constraint(equalTo: containerView.trailingAnchor, constant: -20),
collectionView.widthAnchor.constraint(equalToConstant: 170),
collectionView.heightAnchor.constraint(equalToConstant: 220),
])
}
//CollectionView
override func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return 3
}
override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: collectionCellID, for: indexPath) as! HomeCollectionViewCell
cell.backgroundColor = .blue
return cell
}
override func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
return CGSize(width: 170, height: 220)
}
}
任何帮助将不胜感激!
解决方案
您将不得不覆盖 HomeViewController 中的 cellForItemAt 方法,然后使这项工作的一种方法是在 cellforItemAt 方法中检查您的 collectionView,即
if collectionView == HomeCollectionView
{
//deque home collection view cell and return here
}
else
{
// use: super.collectionView(collectionView, cellForItemAt: indexPath)
}
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