From 5b25d6ab6136b6d11cba84c3445b6754f4edd5fc Mon Sep 17 00:00:00 2001
From: Denys Telezhkin <strangervir@gmail.com>
Date: Fri, 14 May 2021 15:25:06 +0300
Subject: [PATCH] Fix build issue for Xcode 12.4

---
 CHANGELOG.md                                  |  4 ++++
 .../DTCollectionViewDataSource.swift          | 22 +++++++++++++++++++
 2 files changed, 26 insertions(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index fd29a2d..9bc5848 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,10 @@ All notable changes to this project will be documented in this file.
 
 # Next
 
+### Fixed
+
+* Build issue for Xcode 12.4, now compatible with both Xcode 12.5 and 12.4 and lower
+
 ## [7.1.1](https://github.com/DenTelezhkin/DTCollectionViewManager/releases/tag/7.1.1)
 
 Note: This is backwards-compatibility release, it only fixes build issue with Xcode 12.5. For future development please consider migrating to DTCollectionViewManager 8.
diff --git a/Sources/DTCollectionViewManager/DTCollectionViewDataSource.swift b/Sources/DTCollectionViewManager/DTCollectionViewDataSource.swift
index e16f3e6..84c3cec 100644
--- a/Sources/DTCollectionViewManager/DTCollectionViewDataSource.swift
+++ b/Sources/DTCollectionViewManager/DTCollectionViewDataSource.swift
@@ -106,6 +106,27 @@ open class DTCollectionViewDataSource: DTCollectionViewDelegateWrapper, UICollec
                                                                   to: destination)
     }
     
+    #if swift(<5.4)
+    /// Implementation of `UICollectionViewDataSource` protocol.
+    @available(tvOS 10.2, *)
+    open func indexTitles(for collectionView: UICollectionView) -> [String]? {
+        if let reaction = unmappedReactions.first(where: { $0.methodSignature == EventMethodSignature.indexTitlesForCollectionView.rawValue }) {
+            return reaction.performWithArguments((0, 0, 0)) as? [String]
+        }
+        return (delegate as? UICollectionViewDataSource)?.indexTitles?(for: collectionView)
+    }
+    
+    /// Implementation of `UICollectionViewDataSource` protocol.
+    @available(tvOS 10.2, *)
+    open func collectionView(_ collectionView: UICollectionView, indexPathForIndexTitle title: String, at index: Int) -> IndexPath {
+        if let indexPath = performNonCellReaction(.indexPathForIndexTitleAtIndex, argumentOne: title, argumentTwo: index) as? IndexPath {
+            return indexPath
+        }
+        return (delegate as? UICollectionViewDataSource)?.collectionView?(collectionView,
+                                                                          indexPathForIndexTitle: title,
+                                                                          at: index) ?? IndexPath(item: 0, section: 0)
+    }
+    #else
     @available(iOS 14.0, tvOS 10.2, *)
     /// Implementation of `UICollectionViewDataSource` protocol.
     open func indexTitles(for collectionView: UICollectionView) -> [String]? {
@@ -125,4 +146,5 @@ open class DTCollectionViewDataSource: DTCollectionViewDelegateWrapper, UICollec
                                                                           indexPathForIndexTitle: title,
                                                                           at: index) ?? IndexPath(item: 0, section: 0)
     }
+    #endif
 }