如何解决UICollectionView内部的UICollectionView具有动态高度
我正在尝试创建与App Store类似的布局。我有一个垂直的集合视图,在其中的每一行是另一个水平的集合视图。
我正在尝试使用动态高度,以便该单元格可以根据内部内容增加其高度。但是,这永远行不通,仅当我使用sizeForItemAt函数显式设置它时,它才起作用。我还希望能够控制宽度
我看过很多以前的问题,例如:UICollectionView,full width cells,allow autolayout dynamic height?,但是没有答案对我有用。
我对自己做错了真的很困惑。
import UIKit
class HomeViewController: UICollectionViewController {
public override func viewDidLoad() {
super.viewDidLoad()
let collectionViewLayout = UICollectionViewFlowLayout()
collectionViewLayout.scrollDirection = .vertical
collectionViewLayout.estimatedItemSize = UICollectionViewFlowLayout.automaticSize
collectionView.collectionViewLayout = collectionViewLayout
collectionView.translatesAutoresizingMaskIntoConstraints = false
collectionView?.register(HorizontalCollectionView.self,forCellWithReuseIdentifier: HorizontalCollectionView.reuseIdentifier)
}
public override func collectionView(_ collectionView: UICollectionView,numberOfItemsInSection section: Int) -> Int {
return 1
}
public override func numberOfSections(in collectionView: UICollectionView) -> Int {
return 4
}
public override func collectionView(_ collectionView: UICollectionView,cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
if let cell = collectionView.dequeueReusableCell(withReuseIdentifier: HorizontalCollectionView.reuseIdentifier,for: indexPath) as? HorizontalCollectionView {
return cell
}
return UICollectionViewCell()
}
}
HorizontalCollectionView.swift
import UIKit
class HorizontalCollectionView: UICollectionViewCell,UICollectionViewDataSource,UICollectionViewDelegate,UICollectionViewDelegateFlowLayout {
static let reuseIdentifier = "HorizontalCollectionView"
var cellSpancolumns: CGFloat?
override init(frame: CGRect) {
super.init(frame: frame)
collectionView.register(UICollectionViewCell.self,forCellWithReuseIdentifier: "cell")
collectionView.delegate = self
collectionView.dataSource = self
addSubview(collectionView)
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented - Storyboards are not used.")
}
lazy var collectionView: UICollectionView = {
let layout = UICollectionViewFlowLayout()
layout.scrollDirection = .horizontal
layout.estimatedItemSize = UICollectionViewFlowLayout.automaticSize
let collectionView = UICollectionView(frame: bounds,collectionViewLayout: layout)
collectionView.translatesAutoresizingMaskIntoConstraints = false
collectionView.showsHorizontalScrollIndicator = false
return collectionView
}()
func collectionView(_ collectionView: UICollectionView,numberOfItemsInSection section: Int) -> Int {
return 3
}
func numberOfSections(in collectionView: UICollectionView) -> Int {
return 1
}
func collectionView(_ collectionView: UICollectionView,cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell",for: indexPath)
if (indexPath as NSIndexPath).section == 0 {
cell.backgroundColor = UIColor.blue
} else {
cell.backgroundColor = UIColor.red
}
return cell
}
}
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