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fbshipit-source-id: c38b897b9e2b87c782e0e01b0145d9189dc7f9d8

Example/IGListKitExamples/ViewControllers/SearchViewController.swift

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+/**
+ Copyright (c) 2016-present, Facebook, Inc. All rights reserved.
+
+ The examples provided by Facebook are for non-commercial testing and evaluation
+ purposes only. Facebook reserves all rights not expressly granted.
+
+ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ FACEBOOK BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+import UIKit
+import IGListKit
+
+class SearchViewController: UIViewController, IGListAdapterDataSource, SearchSectionControllerDelegate {
+
+    lazy var adapter: IGListAdapter = {
+        return IGListAdapter(updater: IGListAdapterUpdater(), viewController: self, workingRangeSize: 0)
+    }()
+    let collectionView = IGListCollectionView(frame: CGRect.zero, collectionViewLayout: UICollectionViewFlowLayout())
+    lazy var words: [String] = {
+        let str = "Humblebrag skateboard tacos viral small batch blue bottle, schlitz fingerstache etsy squid. Listicle tote bag helvetica XOXO literally, meggings cardigan kickstarter roof party deep v selvage scenester venmo truffaut. You probably haven't heard of them fanny pack austin next level 3 wolf moon. Everyday carry offal brunch 8-bit, keytar banjo pinterest leggings hashtag wolf raw denim butcher. Single-origin coffee try-hard echo park neutra, cornhole banh mi meh austin readymade tacos taxidermy pug tattooed. Cold-pressed +1 ethical, four loko cardigan meh forage YOLO health goth sriracha kale chips. Mumblecore cardigan humblebrag, lo-fi typewriter truffaut leggings health goth."
+        var words = [String]()
+        let range = str.startIndex ..< str.endIndex
+        str.enumerateSubstrings(in: range, options: .byWords, { (substring, _, _, _) in
+            words.append(substring!)
+        })
+        return words
+    }()
+    var filterString = ""
+    let searchToken = NSObject()
+
+    override func viewDidLoad() {
+        super.viewDidLoad()
+        view.addSubview(collectionView)
+        adapter.collectionView = collectionView
+        adapter.dataSource = self
+    }
+
+    override func viewDidLayoutSubviews() {
+        super.viewDidLayoutSubviews()
+        collectionView.frame = view.bounds
+    }
+
+    //MARK: IGListAdapterDataSource
+
+    func objects(for listAdapter: IGListAdapter) -> [IGListDiffable] {
+        var items: [IGListDiffable] = [searchToken]
+        for word in words {
+            if filterString == "" || word.lowercased().contains(filterString.lowercased()) {
+                items.append(word as IGListDiffable)
+            }
+        }
+        return items
+    }
+
+    func listAdapter(_ listAdapter: IGListAdapter, sectionControllerFor object: Any) -> IGListSectionController {
+        if let obj = object as? NSObject, obj === searchToken {
+            let sectionController = SearchSectionController()
+            sectionController.delegate = self
+            return sectionController
+        } else {
+            return LabelSectionController()
+        }
+    }
+
+    func emptyView(for listAdapter: IGListAdapter) -> UIView? {
+        return nil
+    }
+
+    //MARK: SearchSectionControllerDelegate
+
+    func searchSectionController(_ sectionController: SearchSectionController, didChangeText text: String) {
+        filterString = text
+        adapter.performUpdates(animated: true, completion: nil)
+    }
+
+}