CollectionView在StackView中消失(Swift)

,但由于某些原因,当使用:a.fill分布时,包含collectionView的顶部堆栈消失

stackView.distribution = .fill        (stack containing collectionView disappears)
stackView.distribution = .fillEqually (collectionView appears fine in stackView)

我已经为此挣扎了好几天,你会在我评论过的部分中看到残留物:设置压缩阻力/拥抱优先级,尝试改变固有高度,改变布局。UICollectionViewFlowLayout()的itemSize等…我手里什么都用不了。如果您只需将其粘贴到中并将其与空的UIViewController关联,则此处的代码将运行。顶部的collectionView堆栈包含一个pickerView,下面的堆栈是PageControlView、按钮子堆栈和UIView。它在.fillEqualize分布中运行良好,因此这纯粹是一个布局问题。非常感谢!

// CodeStackVC2
// Test of programmatically generated stack views
// Output: nested stack views
// To make it run:
// 1) Assign the blank storyboard VC as CodeStackVC2
// 2) Move the "Is Inital VC" arrow to the blank storyboard

import UIKit

class CodeStackVC2: UIViewController, UICollectionViewDataSource, UICollectionViewDelegate,UICollectionViewDelegateFlowLayout, UIGestureRecognizerDelegate {

  let fruit = ["Apple", "Orange", "Plum", "Qiwi", "Banana"]
  let veg = ["Lettuce", "Carrot", "Celery", "Onion", "Brocolli"]
  let meat = ["Beef", "Chicken", "Ham", "Lamb"]
  let bread = ["Wheat", "Muffin", "Rye", "Pita"]
  var foods = [[String]]()
  let button = ["bread","fruit","meat","veg"]

  var sView = UIStackView()
  let cellId = "cellId"

  override func viewDidLoad() {
    super.viewDidLoad()
    foods = [fruit, veg, meat, bread]
    setupViews()
  }

  //MARK: Views
  lazy var cView: UICollectionView = {
    let layout = UICollectionViewFlowLayout()
    layout.scrollDirection = .horizontal
    layout.minimumLineSpacing = 0
    layout.sectionInset = UIEdgeInsets(top: 5, left: 5, bottom: 5, right: 5)
    layout.itemSize = CGSize(width: self.view.frame.width, height: 120)
    let cv = UICollectionView(frame: self.view.frame, collectionViewLayout: layout)
     cv.backgroundColor = UIColor.lightGray
    cv.isPagingEnabled = true
    cv.dataSource = self
    cv.delegate = self
    cv.isUserInteractionEnabled = true
    //    var intrinsicContentSize: CGSize {
    //      return CGSize(width: UIViewNoIntrinsicMetric, height: 120)
    //    }
    return cv
  }()

  lazy var pageControl: UIPageControl = {
    let pageC = UIPageControl()
    pageC.numberOfPages = self.foods.count
    pageC.pageIndicatorTintColor = UIColor.darkGray
    pageC.currentPageIndicatorTintColor = UIColor.white
    pageC.backgroundColor = .lightGray
    pageC.addTarget(self, action: #selector(changePage(sender:)), for: UIControlEvents.valueChanged)
//    pageC.setContentHuggingPriority(900, for: .vertical)
//    pageC.setContentCompressionResistancePriority(100, for: .vertical)
    return pageC
  }()

  var readerView: UIView = {
    let rView = UIView()
    rView.backgroundColor = UIColor.brown
//    rView.setContentHuggingPriority(100, for: .vertical)
//    rView.setContentCompressionResistancePriority(900, for: .vertical)
    return rView
  }()


  func makeButton(_ name:String) -> UIButton{
    let newButton = UIButton(type: .system)
    let img = UIImage(named: name)?.withRenderingMode(.alwaysTemplate)
    newButton.setImage(img, for: .normal)
    newButton.contentMode = .scaleAspectFit
    newButton.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(handleButton)))
    newButton.isUserInteractionEnabled = true
    newButton.backgroundColor = .orange
    return newButton
  }
  //Make a 4-item vertical stackView containing
  //cView,pageView,subStackof 4-item horiz buttons, readerView
  func setupViews(){
    cView.register(FoodCell.self, forCellWithReuseIdentifier: cellId)
    //generate an array of buttons
    var buttons = [UIButton]()
    for i in 0...foods.count-1 {
      buttons += [makeButton(button[i])]
    }
    let subStackView = UIStackView(arrangedSubviews: buttons)
    subStackView.axis = .horizontal
    subStackView.distribution = .fillEqually
    subStackView.alignment = .center
    subStackView.spacing = 20
    //set up the stackView
    let stackView = UIStackView(arrangedSubviews: [cView,pageControl,subStackView,readerView])
    stackView.axis = .vertical
    //.fillEqually works, .fill deletes cView, .fillProportionally & .equalSpacing delete cView & readerView
    stackView.distribution = .fillEqually
    stackView.alignment = .fill
    stackView.spacing = 5
    //Add the stackView using AutoLayout
    view.addSubview(stackView)
    stackView.translatesAutoresizingMaskIntoConstraints = false
    stackView.topAnchor.constraint(equalTo: view.topAnchor, constant: 5).isActive = true
    stackView.leadingAnchor.constraint(equalTo: view.leadingAnchor).isActive = true
    stackView.trailingAnchor.constraint(equalTo: view.trailingAnchor).isActive = true
    stackView.bottomAnchor.constraint(equalTo: view.bottomAnchor).isActive = true
  }

  func handleButton() {
    print("button pressed")
  }
  //pageControl page changer
  func changePage(sender: AnyObject) -> () {
    let x = CGFloat(pageControl.currentPage) * cView.frame.size.width
    cView.setContentOffset(CGPoint(x:x, y:0), animated: true)
  }

  //MARK: horizontally scrolling Chapter collectionView
  func scrollViewDidScroll(_ scrollView: UIScrollView) {
    //    let scrollBarLeft = CGFloat(scrollView.contentOffset.x) / CGFloat(book.chap.count + 1)
    //    let scrollBarWidth = CGFloat( menuBar.frame.width) / CGFloat(book.chap.count + 1)
  }

  func scrollViewWillEndDragging(_ scrollView: UIScrollView, withVelocity velocity: CGPoint, targetContentOffset: UnsafeMutablePointer<CGPoint>) {
    let index = targetContentOffset.pointee.x / view.frame.width
    pageControl.currentPage = Int(index) //change PageControl indicator
  }

  func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
    return foods.count
  }

  func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: cellId, for: indexPath) as! FoodCell
    cell.foodType = foods[indexPath.item]
    return cell
  }

  func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
    return CGSize(width: view.frame.width, height: 120)
  }
}

class FoodCell:UICollectionViewCell, UIPickerViewDelegate, UIPickerViewDataSource {

  var foodType: [String]? {
    didSet {
      pickerView.reloadComponent(0)
      pickerView.selectRow(0, inComponent: 0, animated: true)
    }
  }

  lazy var pickerView: UIPickerView = {
    let pView = UIPickerView()
    pView.frame = CGRect(x:0,y:0,width:Int(pView.bounds.width), height:Int(pView.bounds.height))
    pView.delegate = self
    pView.dataSource = self
    pView.backgroundColor = .darkGray
    return pView
  }()

  override init(frame: CGRect) {
    super.init(frame: frame)
    setupViews()
  }

  func setupViews() {
    backgroundColor = .clear
    addSubview(pickerView)
    addConstraintsWithFormat("H:|[v0]|", views: pickerView)
    addConstraintsWithFormat("V:|[v0]|", views: pickerView)
  }
  required init?(coder aDecoder: NSCoder) {
    fatalError("init(coder:) has not been implemented")
  }

  func numberOfComponents(in pickerView: UIPickerView) -> Int {
    return 1
  }

  func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
    if let count = foodType?.count {
      return count
    } else {
      return 0
    }
  }

  func pickerView(_ pickerView: UIPickerView, viewForRow row: Int, forComponent component: Int, reusing view: UIView?) -> UIView {
    let pickerLabel = UILabel()
    pickerLabel.font = UIFont.systemFont(ofSize: 15)
    pickerLabel.textAlignment = .center
    pickerLabel.adjustsFontSizeToFitWidth = true
    if let foodItem = foodType?[row] {
      pickerLabel.text = foodItem
      pickerLabel.textColor = .white
      return pickerLabel
    } else {
      print("chap = nil in viewForRow")
      return UIView()
    }
  }


}