Initial commit

Examples/Example-iOS/MountainsViewController.swift

@@ -0,0 +1,84 @@
+import UIKit
+import DiffableDataSources
+
+final class MountainsViewController: UIViewController {
+    enum Section {
+        case main
+    }
+
+    struct Mountain: Hashable {
+        var name: String
+
+        func contains(_ filter: String) -> Bool {
+            guard !filter.isEmpty else {
+                return true
+            }
+
+            let lowercasedFilter = filter.lowercased()
+            return name.lowercased().contains(lowercasedFilter)
+        }
+    }
+
+    @IBOutlet private var searchBar: UISearchBar!
+    @IBOutlet private var collectionView: UICollectionView!
+
+    private lazy var dataSource = CollectionViewDiffableDataSource<Section, Mountain>(collectionView: collectionView) { collectionView, indexPath, mountain in
+        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: LabelCell.name, for: indexPath) as! LabelCell
+        cell.label.text = mountain.name
+        return cell
+    }
+
+    private let allMountains: [Mountain] = mountainsRawData.components(separatedBy: .newlines).map { line in
+        let name = line.components(separatedBy: ",")[0]
+        return Mountain(name: name)
+    }
+
+    override func viewDidLoad() {
+        super.viewDidLoad()
+
+        title = "Mountains Search"
+
+        searchBar.delegate = self
+        collectionView.delegate = self
+        collectionView.register(UINib(nibName: LabelCell.name, bundle: .main), forCellWithReuseIdentifier: LabelCell.name)
+
+        search(filter: "")
+    }
+
+    func search(filter: String) {
+        let mountains = allMountains.lazy
+            .filter { $0.contains(filter) }
+            .sorted { $0.name < $1.name }
+
+        let snapshot = DiffableDataSourceSnapshot<Section, Mountain>()
+        snapshot.appendSections([.main])
+        snapshot.appendItems(mountains)
+        dataSource.apply(snapshot)
+    }
+}
+
+extension MountainsViewController: UISearchBarDelegate {
+    func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
+        search(filter: searchText)
+    }
+}
+
+extension MountainsViewController: UICollectionViewDelegateFlowLayout {
+    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumInteritemSpacingForSectionAt section: Int) -> CGFloat {
+        return 10
+    }
+
+    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAt section: Int) -> CGFloat {
+        return 10
+    }
+
+    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAt section: Int) -> UIEdgeInsets {
+        return UIEdgeInsets(top: 10, left: 10, bottom: 10, right: 10)
+    }
+
+    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
+        let column = 2
+        let width = (collectionView.bounds.width - 10 * CGFloat(column + 1)) / CGFloat(column)
+        return CGSize(width: width, height: 32)
+    }
+}