【发布时间】：2018-09-03 03:22:35
【问题描述】：
我的UICollectionView 中有一些水平的UICollectionViewCell。
我的问题是，如果我将第一个单元格中的 horizontal list 滚动到另一个位置，第四个单元格也将位于同一位置。
第二个和第五个，第三个和第六个……
也不要keep horizontal scroll position从纵向到横向或相反。
有没有办法让单元格中的UICollectionView 保持其位置？
更新 2：
我知道我必须将内部 horizontal 集合视图 content offsets 保存在一个数组中。我在下面的链接中读到了这一点，但在下面的链接中，他们希望在UITableView 和UIScrollView 中实现这一点。我想在UICollectionView 内部UICollectionViewController 中实现这一点。
Scroll View in UITableViewCell won't save position
更新 1：
ViewController.swift
import UIKit
class ViewController: UICollectionViewController, UICollectionViewDelegateFlowLayout {
let cellId = "cellId"
override func viewDidLoad() {
super.viewDidLoad()
collectionView?.backgroundColor = .white
collectionView?.register(CategoryCell.self, forCellWithReuseIdentifier: cellId)
}
override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: cellId, for: indexPath) as! CategoryCell
cell.nameLabel.text = "Horizontal list #\(indexPath.item)"
return cell
}
override func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return 10
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
return CGSize(width: view.frame.width, height: 150)
}
}
CategoryCell.swift
import UIKit
class CategoryCell: UICollectionViewCell, UICollectionViewDataSource, UICollectionViewDelegate, UICollectionViewDelegateFlowLayout {
let cellId = "categoryId"
override init(frame: CGRect) {
super.init(frame: frame)
setupViews()
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
var nameLabel: UILabel = {
let label = UILabel()
label.text = "Horizontal list #1"
label.font = UIFont.systemFont(ofSize: 16)
label.translatesAutoresizingMaskIntoConstraints = false
return label
}()
let appsCollectionView: UICollectionView = {
let layout = UICollectionViewFlowLayout()
layout.scrollDirection = .horizontal
let collectionView = UICollectionView(frame: .zero, collectionViewLayout: layout)
collectionView.translatesAutoresizingMaskIntoConstraints = false
collectionView.backgroundColor = .white
return collectionView
}()
let dividerLineView: UIView = {
let view = UIView()
view.backgroundColor = UIColor(white: 0.4, alpha: 0.4)
view.translatesAutoresizingMaskIntoConstraints = false
return view
}()
func setupViews() {
addSubview(appsCollectionView)
addSubview(dividerLineView)
addSubview(nameLabel)
appsCollectionView.dataSource = self
appsCollectionView.delegate = self
appsCollectionView.register(AppCell.self, forCellWithReuseIdentifier: cellId)
addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "H:|-14-[v0]|", options: NSLayoutFormatOptions(), metrics: nil, views: ["v0": nameLabel]))
addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "H:|-14-[v0]|", options: NSLayoutFormatOptions(), metrics: nil, views: ["v0": dividerLineView]))
addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "H:|[v0]|", options: NSLayoutFormatOptions(), metrics: nil, views: ["v0": appsCollectionView]))
addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "V:|[nameLabel(30)][v0][v1(0.5)]|", options: NSLayoutFormatOptions(), metrics: nil, views: ["v0": appsCollectionView, "v1": dividerLineView, "nameLabel": nameLabel]))
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return 10
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: cellId, for: indexPath) as! AppCell
cell.imageView.backgroundColor = UIColor(hue: CGFloat(indexPath.item) / 20.0, saturation: 0.8, brightness: 0.9, alpha: 1)
return cell
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
return CGSize(width: 100, height: frame.height - 32)
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAt section: Int) -> UIEdgeInsets {
return UIEdgeInsetsMake(0, 14, 0, 14)
}
}
AppCell.swift
import UIKit
class AppCell: UICollectionViewCell {
override init(frame: CGRect) {
super.init(frame: frame)
setupViews()
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
let imageView: UIImageView = {
let iv = UIImageView()
iv.contentMode = .scaleAspectFill
iv.layer.cornerRadius = 16
iv.layer.masksToBounds = true
return iv
}()
func setupViews() {
addSubview(imageView)
imageView.frame = CGRect(x: 0, y: 0, width: frame.width, height: frame.width)
}
}
【问题讨论】：
-
你能分享一个截图来解释你的问题吗？
-
您能分享一下您为此编写的代码或为 UICollectionViewCell 设置的约束吗？所以我们可以解决它。
-
谢谢，屏幕记录和代码已添加。
-
还要取消选中启用分页，否则带有水平滚动的 UICollectionview 会表现得粘滞，并且不会停留在滚动完成的位置。
标签： ios swift uicollectionview uicollectionviewcell horizontallist