From 25dbc3dba419d595a250c60e3aff84d4518532fa Mon Sep 17 00:00:00 2001
From: Anton Schukin <anton.schukin@corp.badoo.com>
Date: Sat, 9 Nov 2019 13:05:24 +0000
Subject: [PATCH] Fixed an issue with wrong scroll indicator insets on iOS 13

---
 .../ChatController/BaseChatViewController.swift    |  7 ++++---
 Chatto/Source/Utils.swift                          | 14 ++++++++++++++
 2 files changed, 18 insertions(+), 3 deletions(-)

diff --git a/Chatto/Source/ChatController/BaseChatViewController.swift b/Chatto/Source/ChatController/BaseChatViewController.swift
index 58cc46523..86db8d729 100644
--- a/Chatto/Source/ChatController/BaseChatViewController.swift
+++ b/Chatto/Source/ChatController/BaseChatViewController.swift
@@ -167,7 +167,8 @@ open class BaseChatViewController: UIViewController, UICollectionViewDataSource,
         collectionView.dataSource = self
         collectionView.delegate = self
         collectionView.chatto_setContentInsetAdjustment(enabled: false, in: self)
-
+        collectionView.chatto_setAutomaticallyAdjustsScrollIndicatorInsets(false)
+        
         self.accessoryViewRevealer = AccessoryViewRevealer(collectionView: collectionView)
         self.collectionView = collectionView
 
@@ -344,12 +345,12 @@ open class BaseChatViewController: UIViewController, UICollectionViewDataSource,
             return currentInsets
         }()
 
-        collectionView.scrollIndicatorInsets = {
+        collectionView.chatto_setVerticalScrollIndicatorInsets({
             var currentInsets = collectionView.scrollIndicatorInsets
             currentInsets.bottom = self.layoutConfiguration.scrollIndicatorInsets.bottom + inputHeightWithKeyboard
             currentInsets.top = self.topLayoutGuide.length + self.layoutConfiguration.scrollIndicatorInsets.top
             return currentInsets
-        }()
+        }())
 
         guard shouldUpdateContentOffset else { return }
 
diff --git a/Chatto/Source/Utils.swift b/Chatto/Source/Utils.swift
index c29126728..032364dbe 100644
--- a/Chatto/Source/Utils.swift
+++ b/Chatto/Source/Utils.swift
@@ -44,4 +44,18 @@ extension UIScrollView {
             viewController.automaticallyAdjustsScrollViewInsets = enabled
         #endif
     }
+
+    func chatto_setAutomaticallyAdjustsScrollIndicatorInsets(_ adjusts: Bool) {
+        if #available(iOS 13.0, *) {
+            self.automaticallyAdjustsScrollIndicatorInsets = adjusts
+        }
+    }
+
+    func chatto_setVerticalScrollIndicatorInsets(_ insets: UIEdgeInsets) {
+        if #available(iOS 11.1, *) {
+            self.verticalScrollIndicatorInsets = insets
+        } else {
+            self.scrollIndicatorInsets = insets
+        }
+    }
 }