Remove IGListSectionType

Summary: Removing the `IGListSectionType` protocol and adding default implementations into `IGListSectionController`. - `numberOfItems` returns 1 - `cellForItemAtIndex:` asserts (have to return a cell) - `didUpdateToObject:` no-ops - `didSelectItemAtIndex:` no-ops Fixes #168 Reviewed By: jessesquires Differential Revision: D4909585 fbshipit-source-id: 8816702504e3fc0683868914ff4dd20e4af7c166
Instagram · Apr 19, 2017 · 3102852 · 3102852
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -100,6 +100,8 @@ This release closes the [3.0.0 milestone](https://github.com/Instagram/IGListKit
 
 - Fix a crash when inserting or deleting from the same index within the same batch-update application. [Ryan Nystrom](https://github.com/rnystrom) [(#616)](https://github.com/Instagram/IGListKit/pull/616)
 
+- `IGListSectionType` protocol was removed and its methods were absorted into the `IGListSectionController` base class with default implementations. [Ryan Nystrom](https://github.com/rnystrom) (tbd)
+
 2.1.0
 -----
 

diff --git a/Examples/Examples-iOS/IGListKitExamples/SectionControllers/DemoSectionController.swift b/Examples/Examples-iOS/IGListKitExamples/SectionControllers/DemoSectionController.swift
@@ -47,29 +47,25 @@ extension DemoItem: IGListDiffable {
 
 }
 
-final class DemoSectionController: IGListSectionController, IGListSectionType {
+final class DemoSectionController: IGListSectionController {
 
     private var object: DemoItem?
 
-    func numberOfItems() -> Int {
-        return 1
-    }
-
-    func sizeForItem(at index: Int) -> CGSize {
+    override func sizeForItem(at index: Int) -> CGSize {
         return CGSize(width: collectionContext!.containerSize.width, height: 55)
     }
 
-    func cellForItem(at index: Int) -> UICollectionViewCell {
+    override func cellForItem(at index: Int) -> UICollectionViewCell {
         let cell = collectionContext!.dequeueReusableCell(of: LabelCell.self, for: self, at: index) as! LabelCell
         cell.text = object?.name
         return cell
     }
 
-    func didUpdate(to object: Any) {
+    override func didUpdate(to object: Any) {
         self.object = object as? DemoItem
     }
 
-    func didSelectItem(at index: Int) {
+    override func didSelectItem(at index: Int) {
         if let identifier = object?.controllerIdentifier {
             let storyboard = UIStoryboard(name: "Demo", bundle: nil)
             let controller = storyboard.instantiateViewController(withIdentifier: identifier)

diff --git a/Examples/Examples-iOS/IGListKitExamples/SectionControllers/DisplaySectionController.swift b/Examples/Examples-iOS/IGListKitExamples/SectionControllers/DisplaySectionController.swift
@@ -15,33 +15,29 @@
 import UIKit
 import IGListKit
 
-final class DisplaySectionController: IGListSectionController, IGListSectionType, IGListDisplayDelegate {
+final class DisplaySectionController: IGListSectionController, IGListDisplayDelegate {
 
     override init() {
         super.init()
         displayDelegate = self
         inset = UIEdgeInsets(top: 0, left: 0, bottom: 30, right: 0)
     }
 
-    func numberOfItems() -> Int {
+    override func numberOfItems() -> Int {
         return 4
     }
 
-    func sizeForItem(at index: Int) -> CGSize {
+    override func sizeForItem(at index: Int) -> CGSize {
         return CGSize(width: collectionContext!.containerSize.width, height: 55)
     }
 
-    func cellForItem(at index: Int) -> UICollectionViewCell {
+    override func cellForItem(at index: Int) -> UICollectionViewCell {
         let cell = collectionContext!.dequeueReusableCell(of: LabelCell.self, for: self, at: index) as! LabelCell
         let section = collectionContext!.section(for: self)
         cell.text = "Section \(section), cell \(index)"
         return cell
     }
 
-    func didUpdate(to object: Any) {}
-
-    func didSelectItem(at index: Int) {}
-
     // MARK: IGListDisplayDelegate
 
     func listAdapter(_ listAdapter: IGListAdapter, willDisplay sectionController: IGListSectionController) {

diff --git a/Examples/Examples-iOS/IGListKitExamples/SectionControllers/EmbeddedSectionController.swift b/Examples/Examples-iOS/IGListKitExamples/SectionControllers/EmbeddedSectionController.swift
@@ -15,7 +15,7 @@
 import UIKit
 import IGListKit
 
-final class EmbeddedSectionController: IGListSectionController, IGListSectionType {
+final class EmbeddedSectionController: IGListSectionController {
 
     private var number: Int?
 
@@ -24,27 +24,21 @@ final class EmbeddedSectionController: IGListSectionController, IGListSectionTyp
         self.inset = UIEdgeInsets(top: 0, left: 0, bottom: 0, right: 10)
     }
 
-    func numberOfItems() -> Int {
-        return 1
-    }
-
-    func sizeForItem(at index: Int) -> CGSize {
+    override func sizeForItem(at index: Int) -> CGSize {
         let height = collectionContext?.containerSize.height ?? 0
         return CGSize(width: height, height: height)
     }
 
-    func cellForItem(at index: Int) -> UICollectionViewCell {
+    override func cellForItem(at index: Int) -> UICollectionViewCell {
         let cell = collectionContext!.dequeueReusableCell(of: CenterLabelCell.self, for: self, at: index) as! CenterLabelCell
         let value = number ?? 0
         cell.text = "\(value + 1)"
         cell.backgroundColor = UIColor(red: 237/255.0, green: 73/255.0, blue: 86/255.0, alpha: 1)
         return cell
     }
 
-    func didUpdate(to object: Any) {
+    override func didUpdate(to object: Any) {
         number = object as? Int
     }
 
-    func didSelectItem(at index: Int) {}
-
 }
diff --git a/Examples/Examples-iOS/IGListKitExamples/SectionControllers/ExpandableSectionController.swift b/Examples/Examples-iOS/IGListKitExamples/SectionControllers/ExpandableSectionController.swift
@@ -15,32 +15,28 @@
 import UIKit
 import IGListKit
 
-final class ExpandableSectionController: IGListSectionController, IGListSectionType {
+final class ExpandableSectionController: IGListSectionController {
 
     private var expanded = false
     private var object: String?
 
-    func numberOfItems() -> Int {
-        return 1
-    }
-
-    func sizeForItem(at index: Int) -> CGSize {
+    override func sizeForItem(at index: Int) -> CGSize {
         let width = collectionContext!.containerSize.width
         let height = expanded ? LabelCell.textHeight(object ?? "", width: width) : LabelCell.singleLineHeight
         return CGSize(width: width, height: height)
     }
 
-    func cellForItem(at index: Int) -> UICollectionViewCell {
+    override func cellForItem(at index: Int) -> UICollectionViewCell {
         let cell = collectionContext!.dequeueReusableCell(of: LabelCell.self, for: self, at: index) as! LabelCell
         cell.text = object
         return cell
     }
 
-    func didUpdate(to object: Any) {
+    override func didUpdate(to object: Any) {
         self.object = object as? String
     }
 
-    func didSelectItem(at index: Int) {
+    override func didSelectItem(at index: Int) {
         expanded = !expanded
         UIView.animate(withDuration: 0.5,
                        delay: 0,

diff --git a/Examples/Examples-iOS/IGListKitExamples/SectionControllers/FeedItemSectionController.swift b/Examples/Examples-iOS/IGListKitExamples/SectionControllers/FeedItemSectionController.swift
@@ -14,7 +14,7 @@
 
 import IGListKit
 
-final class FeedItemSectionController: IGListSectionController, IGListSectionType, IGListSupplementaryViewSource {
+final class FeedItemSectionController: IGListSectionController, IGListSupplementaryViewSource {
 
     private var feedItem: FeedItem!
 
@@ -23,28 +23,26 @@ final class FeedItemSectionController: IGListSectionController, IGListSectionTyp
         supplementaryViewSource = self
     }
 
-    // MARK: IGlistSectionType
+    // MARK: IGListSectionController Overrides
 
-    func numberOfItems() -> Int {
+    override func numberOfItems() -> Int {
         return feedItem.comments.count
     }
 
-    func sizeForItem(at index: Int) -> CGSize {
+    override func sizeForItem(at index: Int) -> CGSize {
         return CGSize(width: collectionContext!.containerSize.width, height: 55)
     }
 
-    func cellForItem(at index: Int) -> UICollectionViewCell {
+    override func cellForItem(at index: Int) -> UICollectionViewCell {
         let cell = collectionContext?.dequeueReusableCell(of: LabelCell.self, for: self, at: index) as! LabelCell
         cell.text = feedItem.comments[index]
         return cell
     }
 
-    func didUpdate(to object: Any) {
+    override func didUpdate(to object: Any) {
         feedItem = object as? FeedItem
     }
 
-    func didSelectItem(at index: Int) {}
-
     // MARK: IGListSupplementaryViewSource
 
     func supportedElementKinds() -> [String] {

diff --git a/Examples/Examples-iOS/IGListKitExamples/SectionControllers/GridSectionController.swift b/Examples/Examples-iOS/IGListKitExamples/SectionControllers/GridSectionController.swift
@@ -39,7 +39,7 @@ extension GridItem: IGListDiffable {
 
 }
 
-final class GridSectionController: IGListSectionController, IGListSectionType {
+final class GridSectionController: IGListSectionController {
 
     private var object: GridItem?
 
@@ -49,27 +49,25 @@ final class GridSectionController: IGListSectionController, IGListSectionType {
         self.minimumLineSpacing = 1
     }
 
-    func numberOfItems() -> Int {
+    override func numberOfItems() -> Int {
         return object?.itemCount ?? 0
     }
 
-    func sizeForItem(at index: Int) -> CGSize {
+    override func sizeForItem(at index: Int) -> CGSize {
         let width = collectionContext?.containerSize.width ?? 0
         let itemSize = floor(width / 4)
         return CGSize(width: itemSize, height: itemSize)
     }
 
-    func cellForItem(at index: Int) -> UICollectionViewCell {
+    override func cellForItem(at index: Int) -> UICollectionViewCell {
         let cell = collectionContext!.dequeueReusableCell(of: CenterLabelCell.self, for: self, at: index) as! CenterLabelCell
         cell.text = "\(index + 1)"
         cell.backgroundColor = object?.color
         return cell
     }
 
-    func didUpdate(to object: Any) {
+    override func didUpdate(to object: Any) {
         self.object = object as? GridItem
     }
 
-    func didSelectItem(at index: Int) {}
-
 }
diff --git a/Examples/Examples-iOS/IGListKitExamples/SectionControllers/HorizontalSectionController.swift b/Examples/Examples-iOS/IGListKitExamples/SectionControllers/HorizontalSectionController.swift
@@ -15,7 +15,7 @@
 import UIKit
 import IGListKit
 
-final class HorizontalSectionController: IGListSectionController, IGListSectionType, IGListAdapterDataSource {
+final class HorizontalSectionController: IGListSectionController, IGListAdapterDataSource {
 
     private var number: Int?
 
@@ -27,26 +27,20 @@ final class HorizontalSectionController: IGListSectionController, IGListSectionT
         return adapter
     }()
 
-    func numberOfItems() -> Int {
-        return 1
-    }
-
-    func sizeForItem(at index: Int) -> CGSize {
+    override func sizeForItem(at index: Int) -> CGSize {
         return CGSize(width: collectionContext!.containerSize.width, height: 100)
     }
 
-    func cellForItem(at index: Int) -> UICollectionViewCell {
+    override func cellForItem(at index: Int) -> UICollectionViewCell {
         let cell = collectionContext!.dequeueReusableCell(of: EmbeddedCollectionViewCell.self, for: self, at: index) as! EmbeddedCollectionViewCell
         adapter.collectionView = cell.collectionView
         return cell
     }
 
-    func didUpdate(to object: Any) {
+    override func didUpdate(to object: Any) {
         number = object as? Int
     }
 
-    func didSelectItem(at index: Int) {}
-
     //MARK: IGListAdapterDataSource
 
     func objects(for listAdapter: IGListAdapter) -> [IGListDiffable] {

diff --git a/Examples/Examples-iOS/IGListKitExamples/SectionControllers/LabelSectionController.swift b/Examples/Examples-iOS/IGListKitExamples/SectionControllers/LabelSectionController.swift
@@ -15,28 +15,22 @@
 import UIKit
 import IGListKit
 
-final class LabelSectionController: IGListSectionController, IGListSectionType {
+final class LabelSectionController: IGListSectionController {
 
     private var object: String?
 
-    func numberOfItems() -> Int {
-        return 1
-    }
-
-    func sizeForItem(at index: Int) -> CGSize {
+    override func sizeForItem(at index: Int) -> CGSize {
         return CGSize(width: collectionContext!.containerSize.width, height: 55)
     }
 
-    func cellForItem(at index: Int) -> UICollectionViewCell {
+    override func cellForItem(at index: Int) -> UICollectionViewCell {
         let cell = collectionContext!.dequeueReusableCell(of: LabelCell.self, for: self, at: index) as! LabelCell
         cell.text = object
         return cell
     }
 
-    func didUpdate(to object: Any) {
+    override func didUpdate(to object: Any) {
         self.object = String(describing: object)
     }
 
-    func didSelectItem(at index: Int) {}
-
 }
diff --git a/Examples/Examples-iOS/IGListKitExamples/SectionControllers/ListeningSectionController.swift b/Examples/Examples-iOS/IGListKitExamples/SectionControllers/ListeningSectionController.swift
@@ -14,7 +14,7 @@
 
 import IGListKit
 
-final class ListeningSectionController: IGListSectionController, IGListSectionType, IncrementListener {
+final class ListeningSectionController: IGListSectionController, IncrementListener {
 
     private var value: Int = 0
 
@@ -28,25 +28,18 @@ final class ListeningSectionController: IGListSectionController, IGListSectionTy
         cell.text = "Section: \(section), value: \(value)"
     }
 
-    // MARK: IGListSectionType
+    // MARK: IGListSectionController Overrides
 
-    func numberOfItems() -> Int {
-        return 1
-    }
-
-    func sizeForItem(at index: Int) -> CGSize {
+    override func sizeForItem(at index: Int) -> CGSize {
         return CGSize(width: collectionContext!.containerSize.width, height: 55)
     }
 
-    func cellForItem(at index: Int) -> UICollectionViewCell {
+    override func cellForItem(at index: Int) -> UICollectionViewCell {
         let cell = collectionContext!.dequeueReusableCell(of: LabelCell.self, for: self, at: index) as! LabelCell
         configureCell(cell: cell)
         return cell
     }
 
-    func didUpdate(to object: Any) {}
-    func didSelectItem(at index: Int) {}
-
     // MARK: IncrementListener
 
     func didIncrement(announcer: IncrementAnnouncer, value: Int) {

diff --git a/Examples/Examples-iOS/IGListKitExamples/SectionControllers/PostSectionController.h b/Examples/Examples-iOS/IGListKitExamples/SectionControllers/PostSectionController.h
@@ -14,6 +14,6 @@
 
 #import <IGListKit/IGListKit.h>
 
-@interface PostSectionController : IGListSectionController <IGListSectionType>
+@interface PostSectionController : IGListSectionController
 
 @end
diff --git a/Examples/Examples-iOS/IGListKitExamples/SectionControllers/PostSectionController.m b/Examples/Examples-iOS/IGListKitExamples/SectionControllers/PostSectionController.m
@@ -26,7 +26,7 @@ @implementation PostSectionController {
     Post *_post;
 }
 
-#pragma mark - IGListSectionType
+#pragma mark - IGListSectionController Overrides
 
 - (NSInteger)numberOfItems {
     return cellsBeforeComments + _post.comments.count;
@@ -69,6 +69,4 @@ - (void)didUpdateToObject:(id)object {
     _post = object;
 }
 
-- (void)didSelectItemAtIndex:(NSInteger)index {}
-
 @end