From 06f38e0b538095e1aa3f648a8feec9e4da2d7311 Mon Sep 17 00:00:00 2001
From: Julian Finkler <julian@mintware.de>
Date: Mon, 16 Dec 2019 20:59:07 +0100
Subject: [PATCH] Fix for Issue #61

While the iOS device is rotating the bounds of the previewView will be recalculated
and the scanRect will be reinitialized

Changes in the WorkspaceSettings are necessary to run the example app
---
 .../xcshareddata/WorkspaceSettings.xcsettings | 10 +++++
 ios/Classes/BarcodeScannerViewController.m    | 44 ++++++++++++-------
 2 files changed, 39 insertions(+), 15 deletions(-)
 create mode 100644 example/ios/Runner.xcworkspace/xcshareddata/WorkspaceSettings.xcsettings

diff --git a/example/ios/Runner.xcworkspace/xcshareddata/WorkspaceSettings.xcsettings b/example/ios/Runner.xcworkspace/xcshareddata/WorkspaceSettings.xcsettings
new file mode 100644
index 0000000..6b30c74
--- /dev/null
+++ b/example/ios/Runner.xcworkspace/xcshareddata/WorkspaceSettings.xcsettings
@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>BuildSystemType</key>
+	<string>Original</string>
+	<key>PreviewsEnabled</key>
+	<false/>
+</dict>
+</plist>
diff --git a/ios/Classes/BarcodeScannerViewController.m b/ios/Classes/BarcodeScannerViewController.m
index da44ca0..0366f0d 100644
--- a/ios/Classes/BarcodeScannerViewController.m
+++ b/ios/Classes/BarcodeScannerViewController.m
@@ -10,6 +10,34 @@
 @implementation BarcodeScannerViewController {
 }
 
+- (void)viewWillTransitionToSize:(CGSize)size withTransitionCoordinator:(id<UIViewControllerTransitionCoordinator>)coordinator
+{
+    CGRect bounds = [UIScreen mainScreen].bounds;
+    CGRect reversedBounds = CGRectMake(bounds.origin.x, bounds.origin.y, bounds.size.height, bounds.size.width);
+    self.previewView.bounds = reversedBounds;
+    self.previewView.frame = reversedBounds;
+    [self.scanRect removeFromSuperview];
+    [self setupScanRect:reversedBounds];
+    [super viewWillTransitionToSize:size withTransitionCoordinator:coordinator];
+}
+
+- (void)setupScanRect:(CGRect)bounds {
+    self.scanRect = [[ScannerOverlay alloc] initWithFrame:bounds];
+    self.scanRect.translatesAutoresizingMaskIntoConstraints = NO;
+    self.scanRect.backgroundColor = UIColor.clearColor;
+    [self.view addSubview:_scanRect];
+    [self.view addConstraints:[NSLayoutConstraint
+                               constraintsWithVisualFormat:@"V:[scanRect]"
+                               options:NSLayoutFormatAlignAllBottom
+                               metrics:nil
+                               views:@{@"scanRect": _scanRect}]];
+    [self.view addConstraints:[NSLayoutConstraint
+                               constraintsWithVisualFormat:@"H:[scanRect]"
+                               options:NSLayoutFormatAlignAllBottom
+                               metrics:nil
+                               views:@{@"scanRect": _scanRect}]];
+    [_scanRect startAnimating];
+}
 
 - (void)viewDidLoad {
     [super viewDidLoad];
@@ -26,21 +54,7 @@
                                 options:NSLayoutFormatAlignAllBottom
                                 metrics:nil
                                   views:@{@"previewView": _previewView}]];
-  self.scanRect = [[ScannerOverlay alloc] initWithFrame:self.view.bounds];
-  self.scanRect.translatesAutoresizingMaskIntoConstraints = NO;
-  self.scanRect.backgroundColor = UIColor.clearColor;
-  [self.view addSubview:_scanRect];
-  [self.view addConstraints:[NSLayoutConstraint
-                             constraintsWithVisualFormat:@"V:[scanRect]"
-                             options:NSLayoutFormatAlignAllBottom
-                             metrics:nil
-                             views:@{@"scanRect": _scanRect}]];
-  [self.view addConstraints:[NSLayoutConstraint
-                             constraintsWithVisualFormat:@"H:[scanRect]"
-                             options:NSLayoutFormatAlignAllBottom
-                             metrics:nil
-                             views:@{@"scanRect": _scanRect}]];
-  [_scanRect startAnimating];
+    [self setupScanRect:self.view.bounds];
     self.scanner = [[MTBBarcodeScanner alloc] initWithPreviewView:_previewView];
     self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemCancel target:self action:@selector(cancel)];
   [self updateFlashButton];