From 5640655b9a3b4ac07220741a1b58c6516cf31aaa Mon Sep 17 00:00:00 2001
From: Garry West <garry.west@solarvista.com>
Date: Fri, 12 Feb 2021 12:02:32 +0000
Subject: [PATCH] Fixing ios front camera crash issue.
 https://github.com/Redth/ZXing.Net.Mobile/issues/978

---
 ZXing.Net.Mobile/iOS/ZXingScannerView.ios.cs | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/ZXing.Net.Mobile/iOS/ZXingScannerView.ios.cs b/ZXing.Net.Mobile/iOS/ZXingScannerView.ios.cs
index 406cd0b4c..2d0fcd729 100644
--- a/ZXing.Net.Mobile/iOS/ZXingScannerView.ios.cs
+++ b/ZXing.Net.Mobile/iOS/ZXingScannerView.ios.cs
@@ -562,13 +562,15 @@ public void StopScanning()
 			// Revert camera settings to original
 			if (captureDevice != null && captureDevice.LockForConfiguration(out var err))
 			{
-				captureDevice.FocusMode = captureDeviceOriginalConfig.FocusMode;
 				captureDevice.ExposureMode = captureDeviceOriginalConfig.ExposureMode;
 				captureDevice.WhiteBalanceMode = captureDeviceOriginalConfig.WhiteBalanceMode;
 
 				if (UIDevice.CurrentDevice.CheckSystemVersion(7, 0) && captureDevice.AutoFocusRangeRestrictionSupported)
 					captureDevice.AutoFocusRangeRestriction = captureDeviceOriginalConfig.AutoFocusRangeRestriction;
 
+				if (captureDevice.IsFocusModeSupported(captureDeviceOriginalConfig.FocusMode))
+					captureDevice.FocusMode = captureDeviceOriginalConfig.FocusMode;
+
 				if (captureDevice.FocusPointOfInterestSupported)
 					captureDevice.FocusPointOfInterest = captureDeviceOriginalConfig.FocusPointOfInterest;