From 78385359e1309a16f7b8f2e61689ed1088e8ebea Mon Sep 17 00:00:00 2001
From: Shadowfacts <me@shadowfacts.net>
Date: Sat, 4 Jan 2020 14:35:23 -0500
Subject: [PATCH] Fix jump when sheet first starts moving

---
 Sources/SheetController/SheetContainerViewController.swift | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Sources/SheetController/SheetContainerViewController.swift b/Sources/SheetController/SheetContainerViewController.swift
index 88509b0..5423a03 100644
--- a/Sources/SheetController/SheetContainerViewController.swift
+++ b/Sources/SheetController/SheetContainerViewController.swift
@@ -154,6 +154,10 @@ open class SheetContainerViewController: UIViewController {
             if scrollViewIsMovingSheet {
                 if initialScrollViewContentOffset == nil {
                     initialScrollViewContentOffset = scrollView.contentOffset
+                    
+                    // if the sheet begins moving part way through the gesture, we need to ignore any translation
+                    // that's already taken place, otherwise the sheet will jump when it starts moving
+                    recognizer.setTranslation(.zero, in: scrollView)
                 }
                 scrollView.setContentOffset(initialScrollViewContentOffset!, animated: false)