Use self-sizing collection view cells in the example

Example/FlexLayoutSample/UI/Examples/CollectionViewExample/CollectionViewExampleView.swift

@@ -18,7 +18,6 @@ class CollectionViewExampleView: UIView {
 
     fileprivate let collectionView: UICollectionView
     fileprivate let flowLayout = UICollectionViewFlowLayout()
-    fileprivate let cellTemplate = HouseCell()
 
     fileprivate var houses: [House] = []
 
@@ -29,6 +28,7 @@ class CollectionViewExampleView: UIView {
 
         flowLayout.minimumLineSpacing = 8
         flowLayout.minimumInteritemSpacing = 0
+        flowLayout.estimatedItemSize = UICollectionViewFlowLayout.automaticSize
 
         if #available(iOS 11.0, *) {
             flowLayout.sectionInsetReference = .fromSafeArea
@@ -71,9 +71,9 @@ extension CollectionViewExampleView: UICollectionViewDelegateFlowLayout, UIColle
         cell.configure(house: houses[indexPath.row])
         return cell
     }
-    
+
     func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
-        cellTemplate.configure(house: houses[indexPath.row])
-        return cellTemplate.sizeThatFits(CGSize(width: collectionView.bounds.width, height: .greatestFiniteMagnitude))
+        // The height is only an estimate. HouseCell computes its actual height in preferredLayoutAttributesFitting(_:).
+        return CGSize(width: collectionView.bounds.width, height: 120)
     }
 }

Example/FlexLayoutSample/UI/Examples/CollectionViewExample/HouseCell.swift

@@ -78,11 +78,16 @@ class HouseCell: UICollectionViewCell {
         layout()
     }
 
+    override func preferredLayoutAttributesFitting(_ layoutAttributes: UICollectionViewLayoutAttributes) -> UICollectionViewLayoutAttributes {
+        let size = sizeThatFits(layoutAttributes.size)
+        layoutAttributes.size = size
+        return layoutAttributes
+    }
+
     override func sizeThatFits(_ size: CGSize) -> CGSize {
-        contentView.pin.width(size.width)
-        layout()
-        return contentView.frame.size
+        return contentView.flex.sizeThatFits(size: CGSize(width: size.width, height: .nan))
     }
+
     private func layout() {
         contentView.flex.layout(mode: .adjustHeight)
     }

Example/FlexLayoutSample/UI/Examples/TableViewExample/TableViewExampleView.swift

@@ -17,7 +17,6 @@ import UIKit
 class TableViewExampleView: UIView {
 
     fileprivate let tableView = UITableView()
-    fileprivate let methodCellTemplate = MethodCell()
 
     fileprivate var methods: [Method] = []
 

Example/FlexLayoutSample/UI/Menu/MenuViewController.swift

@@ -84,10 +84,6 @@ class MenuViewController: BaseViewController {
         mainView.delegate = self
     }
 
-//    override func viewDidAppear(_ animated: Bool) {
-//        super.viewDidAppear(true)
-//        didSelect(pageType: .collectionView)
-//    }
 }
 
 // MARK: MenuViewDelegate