Update README.md

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.swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Workspace
+   version = "1.0">
+   <FileRef
+      location = "self:">
+   </FileRef>
+</Workspace>

Example/Example.xcodeproj/project.pbxproj

@@ -0,0 +1,365 @@
+// !$*UTF8*$!
+{
+	archiveVersion = 1;
+	classes = {
+	};
+	objectVersion = 52;
+	objects = {
+
+/* Begin PBXBuildFile section */
+		22C936D02447221100128DE6 /* AppDelegate.swift in Sources */ = {isa = PBXBuildFile; fileRef = 22C936CF2447221100128DE6 /* AppDelegate.swift */; };
+		22C936D22447221100128DE6 /* SceneDelegate.swift in Sources */ = {isa = PBXBuildFile; fileRef = 22C936D12447221100128DE6 /* SceneDelegate.swift */; };
+		22C936D42447221100128DE6 /* ViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 22C936D32447221100128DE6 /* ViewController.swift */; };
+		22C936D72447221100128DE6 /* Main.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = 22C936D52447221100128DE6 /* Main.storyboard */; };
+		22C936D92447221200128DE6 /* Assets.xcassets in Resources */ = {isa = PBXBuildFile; fileRef = 22C936D82447221200128DE6 /* Assets.xcassets */; };
+		22C936DC2447221200128DE6 /* LaunchScreen.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = 22C936DA2447221200128DE6 /* LaunchScreen.storyboard */; };
+		22C936E52447225600128DE6 /* RoundCode in Frameworks */ = {isa = PBXBuildFile; productRef = 22C936E42447225600128DE6 /* RoundCode */; };
+/* End PBXBuildFile section */
+
+/* Begin PBXFileReference section */
+		22C936CC2447221100128DE6 /* Round Code.app */ = {isa = PBXFileReference; explicitFileType = wrapper.application; includeInIndex = 0; path = "Round Code.app"; sourceTree = BUILT_PRODUCTS_DIR; };
+		22C936CF2447221100128DE6 /* AppDelegate.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AppDelegate.swift; sourceTree = "<group>"; };
+		22C936D12447221100128DE6 /* SceneDelegate.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SceneDelegate.swift; sourceTree = "<group>"; };
+		22C936D32447221100128DE6 /* ViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ViewController.swift; sourceTree = "<group>"; };
+		22C936D62447221100128DE6 /* Base */ = {isa = PBXFileReference; lastKnownFileType = file.storyboard; name = Base; path = Base.lproj/Main.storyboard; sourceTree = "<group>"; };
+		22C936D82447221200128DE6 /* Assets.xcassets */ = {isa = PBXFileReference; lastKnownFileType = folder.assetcatalog; path = Assets.xcassets; sourceTree = "<group>"; };
+		22C936DB2447221200128DE6 /* Base */ = {isa = PBXFileReference; lastKnownFileType = file.storyboard; name = Base; path = Base.lproj/LaunchScreen.storyboard; sourceTree = "<group>"; };
+		22C936DD2447221200128DE6 /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
+/* End PBXFileReference section */
+
+/* Begin PBXFrameworksBuildPhase section */
+		22C936C92447221100128DE6 /* Frameworks */ = {
+			isa = PBXFrameworksBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+				22C936E52447225600128DE6 /* RoundCode in Frameworks */,
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+		};
+/* End PBXFrameworksBuildPhase section */
+
+/* Begin PBXGroup section */
+		22C936C32447221100128DE6 = {
+			isa = PBXGroup;
+			children = (
+				22C936CE2447221100128DE6 /* Example */,
+				22C936CD2447221100128DE6 /* Products */,
+				22C936E32447225600128DE6 /* Frameworks */,
+			);
+			sourceTree = "<group>";
+		};
+		22C936CD2447221100128DE6 /* Products */ = {
+			isa = PBXGroup;
+			children = (
+				22C936CC2447221100128DE6 /* Round Code.app */,
+			);
+			name = Products;
+			sourceTree = "<group>";
+		};
+		22C936CE2447221100128DE6 /* Example */ = {
+			isa = PBXGroup;
+			children = (
+				22C936CF2447221100128DE6 /* AppDelegate.swift */,
+				22C936D12447221100128DE6 /* SceneDelegate.swift */,
+				22C936D32447221100128DE6 /* ViewController.swift */,
+				22C936D52447221100128DE6 /* Main.storyboard */,
+				22C936D82447221200128DE6 /* Assets.xcassets */,
+				22C936DA2447221200128DE6 /* LaunchScreen.storyboard */,
+				22C936DD2447221200128DE6 /* Info.plist */,
+			);
+			path = Example;
+			sourceTree = "<group>";
+		};
+		22C936E32447225600128DE6 /* Frameworks */ = {
+			isa = PBXGroup;
+			children = (
+			);
+			name = Frameworks;
+			sourceTree = "<group>";
+		};
+/* End PBXGroup section */
+
+/* Begin PBXNativeTarget section */
+		22C936CB2447221100128DE6 /* Example */ = {
+			isa = PBXNativeTarget;
+			buildConfigurationList = 22C936E02447221200128DE6 /* Build configuration list for PBXNativeTarget "Example" */;
+			buildPhases = (
+				22C936C82447221100128DE6 /* Sources */,
+				22C936C92447221100128DE6 /* Frameworks */,
+				22C936CA2447221100128DE6 /* Resources */,
+			);
+			buildRules = (
+			);
+			dependencies = (
+			);
+			name = Example;
+			packageProductDependencies = (
+				22C936E42447225600128DE6 /* RoundCode */,
+			);
+			productName = Example;
+			productReference = 22C936CC2447221100128DE6 /* Round Code.app */;
+			productType = "com.apple.product-type.application";
+		};
+/* End PBXNativeTarget section */
+
+/* Begin PBXProject section */
+		22C936C42447221100128DE6 /* Project object */ = {
+			isa = PBXProject;
+			attributes = {
+				LastSwiftUpdateCheck = 1140;
+				LastUpgradeCheck = 1140;
+				ORGANIZATIONNAME = "Haik Aslanyan";
+				TargetAttributes = {
+					22C936CB2447221100128DE6 = {
+						CreatedOnToolsVersion = 11.4;
+					};
+				};
+			};
+			buildConfigurationList = 22C936C72447221100128DE6 /* Build configuration list for PBXProject "Example" */;
+			compatibilityVersion = "Xcode 9.3";
+			developmentRegion = en;
+			hasScannedForEncodings = 0;
+			knownRegions = (
+				en,
+				Base,
+			);
+			mainGroup = 22C936C32447221100128DE6;
+			productRefGroup = 22C936CD2447221100128DE6 /* Products */;
+			projectDirPath = "";
+			projectRoot = "";
+			targets = (
+				22C936CB2447221100128DE6 /* Example */,
+			);
+		};
+/* End PBXProject section */
+
+/* Begin PBXResourcesBuildPhase section */
+		22C936CA2447221100128DE6 /* Resources */ = {
+			isa = PBXResourcesBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+				22C936DC2447221200128DE6 /* LaunchScreen.storyboard in Resources */,
+				22C936D92447221200128DE6 /* Assets.xcassets in Resources */,
+				22C936D72447221100128DE6 /* Main.storyboard in Resources */,
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+		};
+/* End PBXResourcesBuildPhase section */
+
+/* Begin PBXSourcesBuildPhase section */
+		22C936C82447221100128DE6 /* Sources */ = {
+			isa = PBXSourcesBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+				22C936D42447221100128DE6 /* ViewController.swift in Sources */,
+				22C936D02447221100128DE6 /* AppDelegate.swift in Sources */,
+				22C936D22447221100128DE6 /* SceneDelegate.swift in Sources */,
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+		};
+/* End PBXSourcesBuildPhase section */
+
+/* Begin PBXVariantGroup section */
+		22C936D52447221100128DE6 /* Main.storyboard */ = {
+			isa = PBXVariantGroup;
+			children = (
+				22C936D62447221100128DE6 /* Base */,
+			);
+			name = Main.storyboard;
+			sourceTree = "<group>";
+		};
+		22C936DA2447221200128DE6 /* LaunchScreen.storyboard */ = {
+			isa = PBXVariantGroup;
+			children = (
+				22C936DB2447221200128DE6 /* Base */,
+			);
+			name = LaunchScreen.storyboard;
+			sourceTree = "<group>";
+		};
+/* End PBXVariantGroup section */
+
+/* Begin XCBuildConfiguration section */
+		22C936DE2447221200128DE6 /* Debug */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				ALWAYS_SEARCH_USER_PATHS = NO;
+				CLANG_ANALYZER_NONNULL = YES;
+				CLANG_ANALYZER_NUMBER_OBJECT_CONVERSION = YES_AGGRESSIVE;
+				CLANG_CXX_LANGUAGE_STANDARD = "gnu++14";
+				CLANG_CXX_LIBRARY = "libc++";
+				CLANG_ENABLE_MODULES = YES;
+				CLANG_ENABLE_OBJC_ARC = YES;
+				CLANG_ENABLE_OBJC_WEAK = YES;
+				CLANG_WARN_BLOCK_CAPTURE_AUTORELEASING = YES;
+				CLANG_WARN_BOOL_CONVERSION = YES;
+				CLANG_WARN_COMMA = YES;
+				CLANG_WARN_CONSTANT_CONVERSION = YES;
+				CLANG_WARN_DEPRECATED_OBJC_IMPLEMENTATIONS = YES;
+				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
+				CLANG_WARN_DOCUMENTATION_COMMENTS = YES;
+				CLANG_WARN_EMPTY_BODY = YES;
+				CLANG_WARN_ENUM_CONVERSION = YES;
+				CLANG_WARN_INFINITE_RECURSION = YES;
+				CLANG_WARN_INT_CONVERSION = YES;
+				CLANG_WARN_NON_LITERAL_NULL_CONVERSION = YES;
+				CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF = YES;
+				CLANG_WARN_OBJC_LITERAL_CONVERSION = YES;
+				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
+				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
+				CLANG_WARN_STRICT_PROTOTYPES = YES;
+				CLANG_WARN_SUSPICIOUS_MOVE = YES;
+				CLANG_WARN_UNGUARDED_AVAILABILITY = YES_AGGRESSIVE;
+				CLANG_WARN_UNREACHABLE_CODE = YES;
+				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
+				COPY_PHASE_STRIP = NO;
+				DEBUG_INFORMATION_FORMAT = dwarf;
+				ENABLE_STRICT_OBJC_MSGSEND = YES;
+				ENABLE_TESTABILITY = YES;
+				GCC_C_LANGUAGE_STANDARD = gnu11;
+				GCC_DYNAMIC_NO_PIC = NO;
+				GCC_NO_COMMON_BLOCKS = YES;
+				GCC_OPTIMIZATION_LEVEL = 0;
+				GCC_PREPROCESSOR_DEFINITIONS = (
+					"DEBUG=1",
+					"$(inherited)",
+				);
+				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
+				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
+				GCC_WARN_UNDECLARED_SELECTOR = YES;
+				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
+				GCC_WARN_UNUSED_FUNCTION = YES;
+				GCC_WARN_UNUSED_VARIABLE = YES;
+				IPHONEOS_DEPLOYMENT_TARGET = 13.4;
+				MTL_ENABLE_DEBUG_INFO = INCLUDE_SOURCE;
+				MTL_FAST_MATH = YES;
+				ONLY_ACTIVE_ARCH = YES;
+				SDKROOT = iphoneos;
+				SWIFT_ACTIVE_COMPILATION_CONDITIONS = DEBUG;
+				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
+			};
+			name = Debug;
+		};
+		22C936DF2447221200128DE6 /* Release */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				ALWAYS_SEARCH_USER_PATHS = NO;
+				CLANG_ANALYZER_NONNULL = YES;
+				CLANG_ANALYZER_NUMBER_OBJECT_CONVERSION = YES_AGGRESSIVE;
+				CLANG_CXX_LANGUAGE_STANDARD = "gnu++14";
+				CLANG_CXX_LIBRARY = "libc++";
+				CLANG_ENABLE_MODULES = YES;
+				CLANG_ENABLE_OBJC_ARC = YES;
+				CLANG_ENABLE_OBJC_WEAK = YES;
+				CLANG_WARN_BLOCK_CAPTURE_AUTORELEASING = YES;
+				CLANG_WARN_BOOL_CONVERSION = YES;
+				CLANG_WARN_COMMA = YES;
+				CLANG_WARN_CONSTANT_CONVERSION = YES;
+				CLANG_WARN_DEPRECATED_OBJC_IMPLEMENTATIONS = YES;
+				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
+				CLANG_WARN_DOCUMENTATION_COMMENTS = YES;
+				CLANG_WARN_EMPTY_BODY = YES;
+				CLANG_WARN_ENUM_CONVERSION = YES;
+				CLANG_WARN_INFINITE_RECURSION = YES;
+				CLANG_WARN_INT_CONVERSION = YES;
+				CLANG_WARN_NON_LITERAL_NULL_CONVERSION = YES;
+				CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF = YES;
+				CLANG_WARN_OBJC_LITERAL_CONVERSION = YES;
+				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
+				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
+				CLANG_WARN_STRICT_PROTOTYPES = YES;
+				CLANG_WARN_SUSPICIOUS_MOVE = YES;
+				CLANG_WARN_UNGUARDED_AVAILABILITY = YES_AGGRESSIVE;
+				CLANG_WARN_UNREACHABLE_CODE = YES;
+				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
+				COPY_PHASE_STRIP = NO;
+				DEBUG_INFORMATION_FORMAT = "dwarf-with-dsym";
+				ENABLE_NS_ASSERTIONS = NO;
+				ENABLE_STRICT_OBJC_MSGSEND = YES;
+				GCC_C_LANGUAGE_STANDARD = gnu11;
+				GCC_NO_COMMON_BLOCKS = YES;
+				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
+				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
+				GCC_WARN_UNDECLARED_SELECTOR = YES;
+				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
+				GCC_WARN_UNUSED_FUNCTION = YES;
+				GCC_WARN_UNUSED_VARIABLE = YES;
+				IPHONEOS_DEPLOYMENT_TARGET = 13.4;
+				MTL_ENABLE_DEBUG_INFO = NO;
+				MTL_FAST_MATH = YES;
+				SDKROOT = iphoneos;
+				SWIFT_COMPILATION_MODE = wholemodule;
+				SWIFT_OPTIMIZATION_LEVEL = "-O";
+				VALIDATE_PRODUCT = YES;
+			};
+			name = Release;
+		};
+		22C936E12447221200128DE6 /* Debug */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
+				CODE_SIGN_STYLE = Automatic;
+				DEVELOPMENT_TEAM = "";
+				INFOPLIST_FILE = Example/Info.plist;
+				IPHONEOS_DEPLOYMENT_TARGET = 13.0;
+				LD_RUNPATH_SEARCH_PATHS = (
+					"$(inherited)",
+					"@executable_path/Frameworks",
+				);
+				PRODUCT_BUNDLE_IDENTIFIER = com.roundcode.example;
+				PRODUCT_NAME = "Round Code";
+				SWIFT_VERSION = 5.0;
+				TARGETED_DEVICE_FAMILY = "1,2";
+			};
+			name = Debug;
+		};
+		22C936E22447221200128DE6 /* Release */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
+				CODE_SIGN_STYLE = Automatic;
+				DEVELOPMENT_TEAM = "";
+				INFOPLIST_FILE = Example/Info.plist;
+				IPHONEOS_DEPLOYMENT_TARGET = 13.0;
+				LD_RUNPATH_SEARCH_PATHS = (
+					"$(inherited)",
+					"@executable_path/Frameworks",
+				);
+				PRODUCT_BUNDLE_IDENTIFIER = com.roundcode.example;
+				PRODUCT_NAME = "Round Code";
+				SWIFT_VERSION = 5.0;
+				TARGETED_DEVICE_FAMILY = "1,2";
+			};
+			name = Release;
+		};
+/* End XCBuildConfiguration section */
+
+/* Begin XCConfigurationList section */
+		22C936C72447221100128DE6 /* Build configuration list for PBXProject "Example" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				22C936DE2447221200128DE6 /* Debug */,
+				22C936DF2447221200128DE6 /* Release */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
+		22C936E02447221200128DE6 /* Build configuration list for PBXNativeTarget "Example" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				22C936E12447221200128DE6 /* Debug */,
+				22C936E22447221200128DE6 /* Release */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
+/* End XCConfigurationList section */
+
+/* Begin XCSwiftPackageProductDependency section */
+		22C936E42447225600128DE6 /* RoundCode */ = {
+			isa = XCSwiftPackageProductDependency;
+			productName = RoundCode;
+		};
+/* End XCSwiftPackageProductDependency section */
+	};
+	rootObject = 22C936C42447221100128DE6 /* Project object */;
+}

Example/Example/AppDelegate.swift

@@ -0,0 +1,51 @@
+//  MIT License
+
+//  Copyright (c) 2020 Haik Aslanyan
+
+//  Permission is hereby granted, free of charge, to any person obtaining a copy
+//  of this software and associated documentation files (the "Software"), to deal
+//  in the Software without restriction, including without limitation the rights
+//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+//  copies of the Software, and to permit persons to whom the Software is
+//  furnished to do so, subject to the following conditions:
+
+//  The above copyright notice and this permission notice shall be included in all
+//  copies or substantial portions of the Software.
+
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+//  SOFTWARE.
+
+import UIKit
+
+@UIApplicationMain
+class AppDelegate: UIResponder, UIApplicationDelegate {
+
+
+
+  func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
+    // Override point for customization after application launch.
+    return true
+  }
+
+  // MARK: UISceneSession Lifecycle
+
+  func application(_ application: UIApplication, configurationForConnecting connectingSceneSession: UISceneSession, options: UIScene.ConnectionOptions) -> UISceneConfiguration {
+    // Called when a new scene session is being created.
+    // Use this method to select a configuration to create the new scene with.
+    return UISceneConfiguration(name: "Default Configuration", sessionRole: connectingSceneSession.role)
+  }
+
+  func application(_ application: UIApplication, didDiscardSceneSessions sceneSessions: Set<UISceneSession>) {
+    // Called when the user discards a scene session.
+    // If any sessions were discarded while the application was not running, this will be called shortly after application:didFinishLaunchingWithOptions.
+    // Use this method to release any resources that were specific to the discarded scenes, as they will not return.
+  }
+
+
+}
+

Example/Example/Assets.xcassets/AppIcon.appiconset/Contents.json

@@ -0,0 +1,98 @@
+{
+  "images" : [
+    {
+      "idiom" : "iphone",
+      "scale" : "2x",
+      "size" : "20x20"
+    },
+    {
+      "idiom" : "iphone",
+      "scale" : "3x",
+      "size" : "20x20"
+    },
+    {
+      "idiom" : "iphone",
+      "scale" : "2x",
+      "size" : "29x29"
+    },
+    {
+      "idiom" : "iphone",
+      "scale" : "3x",
+      "size" : "29x29"
+    },
+    {
+      "idiom" : "iphone",
+      "scale" : "2x",
+      "size" : "40x40"
+    },
+    {
+      "idiom" : "iphone",
+      "scale" : "3x",
+      "size" : "40x40"
+    },
+    {
+      "idiom" : "iphone",
+      "scale" : "2x",
+      "size" : "60x60"
+    },
+    {
+      "idiom" : "iphone",
+      "scale" : "3x",
+      "size" : "60x60"
+    },
+    {
+      "idiom" : "ipad",
+      "scale" : "1x",
+      "size" : "20x20"
+    },
+    {
+      "idiom" : "ipad",
+      "scale" : "2x",
+      "size" : "20x20"
+    },
+    {
+      "idiom" : "ipad",
+      "scale" : "1x",
+      "size" : "29x29"
+    },
+    {
+      "idiom" : "ipad",
+      "scale" : "2x",
+      "size" : "29x29"
+    },
+    {
+      "idiom" : "ipad",
+      "scale" : "1x",
+      "size" : "40x40"
+    },
+    {
+      "idiom" : "ipad",
+      "scale" : "2x",
+      "size" : "40x40"
+    },
+    {
+      "idiom" : "ipad",
+      "scale" : "1x",
+      "size" : "76x76"
+    },
+    {
+      "idiom" : "ipad",
+      "scale" : "2x",
+      "size" : "76x76"
+    },
+    {
+      "idiom" : "ipad",
+      "scale" : "2x",
+      "size" : "83.5x83.5"
+    },
+    {
+      "idiom" : "ios-marketing",
+      "scale" : "1x",
+      "size" : "1024x1024"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

Example/Example/Assets.xcassets/Contents.json

@@ -0,0 +1,6 @@
+{
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

Example/Example/Base.lproj/LaunchScreen.storyboard

@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="13122.16" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" launchScreen="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="01J-lp-oVM">
+    <dependencies>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="13104.12"/>
+        <capability name="Safe area layout guides" minToolsVersion="9.0"/>
+        <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
+    </dependencies>
+    <scenes>
+        <!--View Controller-->
+        <scene sceneID="EHf-IW-A2E">
+            <objects>
+                <viewController id="01J-lp-oVM" sceneMemberID="viewController">
+                    <view key="view" contentMode="scaleToFill" id="Ze5-6b-2t3">
+                        <rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <color key="backgroundColor" xcode11CocoaTouchSystemColor="systemBackgroundColor" cocoaTouchSystemColor="whiteColor"/>
+                        <viewLayoutGuide key="safeArea" id="6Tk-OE-BBY"/>
+                    </view>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="iYj-Kq-Ea1" userLabel="First Responder" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="53" y="375"/>
+        </scene>
+    </scenes>
+</document>

Example/Example/Base.lproj/Main.storyboard

@@ -0,0 +1,141 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="16096" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="xzF-bb-zO0">
+    <device id="retina6_1" orientation="portrait" appearance="light"/>
+    <dependencies>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="16086"/>
+        <capability name="Safe area layout guides" minToolsVersion="9.0"/>
+        <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
+    </dependencies>
+    <scenes>
+        <!--View Controller-->
+        <scene sceneID="a2g-4i-pyL">
+            <objects>
+                <viewController id="0zP-ee-W0J" customClass="ViewController" customModule="Round_Code" customModuleProvider="target" sceneMemberID="viewController">
+                    <view key="view" contentMode="scaleToFill" id="Rvj-Nv-Ukh">
+                        <rect key="frame" x="0.0" y="0.0" width="414" height="896"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <subviews>
+                            <imageView clipsSubviews="YES" userInteractionEnabled="NO" contentMode="scaleAspectFit" horizontalHuggingPriority="251" verticalHuggingPriority="251" translatesAutoresizingMaskIntoConstraints="NO" id="IDN-sg-2ib">
+                                <rect key="frame" x="20" y="129" width="374" height="374"/>
+                                <constraints>
+                                    <constraint firstAttribute="width" secondItem="IDN-sg-2ib" secondAttribute="height" multiplier="1:1" id="mKx-mn-H2a"/>
+                                </constraints>
+                            </imageView>
+                            <textField opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="left" contentVerticalAlignment="center" borderStyle="roundedRect" placeholder="Message" minimumFontSize="17" clearButtonMode="always" translatesAutoresizingMaskIntoConstraints="NO" id="KyC-Sh-W2M">
+                                <rect key="frame" x="5" y="503" width="404" height="27"/>
+                                <constraints>
+                                    <constraint firstAttribute="height" constant="27" id="BZz-IP-j2V"/>
+                                </constraints>
+                                <fontDescription key="fontDescription" type="system" pointSize="14"/>
+                                <textInputTraits key="textInputTraits" autocorrectionType="no" spellCheckingType="no"/>
+                                <connections>
+                                    <action selector="didType:" destination="0zP-ee-W0J" eventType="editingChanged" id="Efh-0Z-Lqo"/>
+                                    <outlet property="delegate" destination="0zP-ee-W0J" id="ZBB-tX-bvC"/>
+                                </connections>
+                            </textField>
+                            <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="akC-qR-hPk">
+                                <rect key="frame" x="20" y="129" width="374" height="374"/>
+                                <connections>
+                                    <action selector="setImage:" destination="0zP-ee-W0J" eventType="touchUpInside" id="czy-4J-2pc"/>
+                                </connections>
+                            </button>
+                            <segmentedControl opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="left" contentVerticalAlignment="top" segmentControlStyle="plain" selectedSegmentIndex="0" translatesAutoresizingMaskIntoConstraints="NO" id="zZa-y7-66Y">
+                                <rect key="frame" x="20" y="93" width="374" height="32"/>
+                                <segments>
+                                    <segment title="Orange"/>
+                                    <segment title="Red"/>
+                                    <segment title="Green"/>
+                                    <segment title="Brown"/>
+                                    <segment title="Cyan"/>
+                                </segments>
+                                <connections>
+                                    <action selector="setColor:" destination="0zP-ee-W0J" eventType="valueChanged" id="ULi-2Q-VAM"/>
+                                </connections>
+                            </segmentedControl>
+                            <label hidden="YES" opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="" textAlignment="center" lineBreakMode="tailTruncation" numberOfLines="0" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="pan-9N-son">
+                                <rect key="frame" x="0.0" y="88" width="414" height="774"/>
+                                <color key="backgroundColor" systemColor="systemBackgroundColor" cocoaTouchSystemColor="whiteColor"/>
+                                <fontDescription key="fontDescription" type="system" pointSize="32"/>
+                                <nil key="textColor"/>
+                                <nil key="highlightedColor"/>
+                            </label>
+                        </subviews>
+                        <color key="backgroundColor" systemColor="systemBackgroundColor" cocoaTouchSystemColor="whiteColor"/>
+                        <constraints>
+                            <constraint firstItem="aXm-cj-1eD" firstAttribute="trailing" secondItem="zZa-y7-66Y" secondAttribute="trailing" constant="20" id="5cA-OR-hh7"/>
+                            <constraint firstItem="akC-qR-hPk" firstAttribute="width" secondItem="IDN-sg-2ib" secondAttribute="width" id="603-Vl-61F"/>
+                            <constraint firstItem="aXm-cj-1eD" firstAttribute="trailing" secondItem="pan-9N-son" secondAttribute="trailing" id="9oj-QO-fMG"/>
+                            <constraint firstItem="zZa-y7-66Y" firstAttribute="top" secondItem="aXm-cj-1eD" secondAttribute="top" constant="5" id="AoR-LT-Gch"/>
+                            <constraint firstItem="IDN-sg-2ib" firstAttribute="centerX" secondItem="Rvj-Nv-Ukh" secondAttribute="centerX" id="EaP-Hv-Hz2"/>
+                            <constraint firstItem="KyC-Sh-W2M" firstAttribute="leading" secondItem="aXm-cj-1eD" secondAttribute="leading" constant="5" id="Hkf-Qo-pLm"/>
+                            <constraint firstItem="IDN-sg-2ib" firstAttribute="leading" secondItem="aXm-cj-1eD" secondAttribute="leading" constant="20" id="HpO-I0-NCL"/>
+                            <constraint firstItem="akC-qR-hPk" firstAttribute="height" secondItem="IDN-sg-2ib" secondAttribute="height" id="KuT-uW-Bnc"/>
+                            <constraint firstItem="IDN-sg-2ib" firstAttribute="top" secondItem="zZa-y7-66Y" secondAttribute="bottom" constant="5" id="RoW-mq-u55"/>
+                            <constraint firstItem="zZa-y7-66Y" firstAttribute="leading" secondItem="aXm-cj-1eD" secondAttribute="leading" constant="20" id="ZgL-Z2-tgR"/>
+                            <constraint firstItem="IDN-sg-2ib" firstAttribute="trailing" secondItem="aXm-cj-1eD" secondAttribute="trailing" constant="-20" id="ayw-8g-tlm"/>
+                            <constraint firstItem="KyC-Sh-W2M" firstAttribute="centerX" secondItem="Rvj-Nv-Ukh" secondAttribute="centerX" id="moY-9V-bbk"/>
+                            <constraint firstItem="aXm-cj-1eD" firstAttribute="bottom" secondItem="pan-9N-son" secondAttribute="bottom" id="pCj-pu-ong"/>
+                            <constraint firstItem="akC-qR-hPk" firstAttribute="centerY" secondItem="IDN-sg-2ib" secondAttribute="centerY" id="uaL-Io-awN"/>
+                            <constraint firstItem="pan-9N-son" firstAttribute="leading" secondItem="aXm-cj-1eD" secondAttribute="leading" id="wYb-6N-3CK"/>
+                            <constraint firstItem="KyC-Sh-W2M" firstAttribute="top" secondItem="IDN-sg-2ib" secondAttribute="bottom" id="xdH-CM-DTh"/>
+                            <constraint firstItem="pan-9N-son" firstAttribute="top" secondItem="aXm-cj-1eD" secondAttribute="top" id="xxe-7M-C1w"/>
+                            <constraint firstItem="akC-qR-hPk" firstAttribute="centerX" secondItem="IDN-sg-2ib" secondAttribute="centerX" id="yBy-TJ-2Y7"/>
+                        </constraints>
+                        <viewLayoutGuide key="safeArea" id="aXm-cj-1eD"/>
+                    </view>
+                    <navigationItem key="navigationItem" id="XgG-ZM-i9d">
+                        <leftBarButtonItems>
+                            <barButtonItem title="Share" id="so2-d3-VCF">
+                                <connections>
+                                    <action selector="share:" destination="0zP-ee-W0J" id="uNU-bV-PaS"/>
+                                </connections>
+                            </barButtonItem>
+                            <barButtonItem title="Config" id="33c-Ng-bhx">
+                                <connections>
+                                    <action selector="changeConfig:" destination="0zP-ee-W0J" id="izA-qU-8it"/>
+                                </connections>
+                            </barButtonItem>
+                        </leftBarButtonItems>
+                        <rightBarButtonItems>
+                            <barButtonItem title="Camera" id="Ckh-RB-Kad">
+                                <connections>
+                                    <action selector="scan:" destination="0zP-ee-W0J" id="h78-sA-B0C"/>
+                                </connections>
+                            </barButtonItem>
+                            <barButtonItem title="Image" id="rwW-La-cl3">
+                                <connections>
+                                    <action selector="scanImage:" destination="0zP-ee-W0J" id="Cdh-9Q-DD2"/>
+                                </connections>
+                            </barButtonItem>
+                        </rightBarButtonItems>
+                    </navigationItem>
+                    <connections>
+                        <outlet property="imageView" destination="IDN-sg-2ib" id="V1v-sS-seZ"/>
+                        <outlet property="messageLabel" destination="pan-9N-son" id="mQD-Ag-JzI"/>
+                        <outlet property="textField" destination="KyC-Sh-W2M" id="6ZV-gl-0Oq"/>
+                    </connections>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="Fmj-W7-iXK" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="3992.8000000000002" y="1049.3253373313344"/>
+        </scene>
+        <!--Navigation Controller-->
+        <scene sceneID="lJm-py-Mqj">
+            <objects>
+                <navigationController automaticallyAdjustsScrollViewInsets="NO" id="xzF-bb-zO0" sceneMemberID="viewController">
+                    <toolbarItems/>
+                    <navigationBar key="navigationBar" contentMode="scaleToFill" insetsLayoutMarginsFromSafeArea="NO" id="ryo-Z5-nM2">
+                        <rect key="frame" x="0.0" y="44" width="414" height="44"/>
+                        <autoresizingMask key="autoresizingMask"/>
+                    </navigationBar>
+                    <nil name="viewControllers"/>
+                    <connections>
+                        <segue destination="0zP-ee-W0J" kind="relationship" relationship="rootViewController" id="mY9-sh-m1Z"/>
+                    </connections>
+                </navigationController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="ZPe-rv-4ch" userLabel="First Responder" customClass="UIResponder" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="3050" y="1050"/>
+        </scene>
+    </scenes>
+</document>

Example/Example/Info.plist

@@ -0,0 +1,70 @@
+<?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>CFBundleDevelopmentRegion</key>
+	<string>$(DEVELOPMENT_LANGUAGE)</string>
+	<key>CFBundleExecutable</key>
+	<string>$(EXECUTABLE_NAME)</string>
+	<key>CFBundleIdentifier</key>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>$(PRODUCT_NAME)</string>
+	<key>CFBundlePackageType</key>
+	<string>$(PRODUCT_BUNDLE_PACKAGE_TYPE)</string>
+	<key>CFBundleShortVersionString</key>
+	<string>1.0</string>
+	<key>CFBundleVersion</key>
+	<string>1</string>
+	<key>LSRequiresIPhoneOS</key>
+	<true/>
+	<key>NSAppleMusicUsageDescription</key>
+	<string>To scan roundcodes</string>
+	<key>NSPhotoLibraryAddUsageDescription</key>
+	<string>To save RoundCode images</string>
+	<key>NSCameraUsageDescription</key>
+	<string>To scan roundcodes</string>
+	<key>UIApplicationSceneManifest</key>
+	<dict>
+		<key>UIApplicationSupportsMultipleScenes</key>
+		<false/>
+		<key>UISceneConfigurations</key>
+		<dict>
+			<key>UIWindowSceneSessionRoleApplication</key>
+			<array>
+				<dict>
+					<key>UISceneConfigurationName</key>
+					<string>Default Configuration</string>
+					<key>UISceneDelegateClassName</key>
+					<string>$(PRODUCT_MODULE_NAME).SceneDelegate</string>
+					<key>UISceneStoryboardFile</key>
+					<string>Main</string>
+				</dict>
+			</array>
+		</dict>
+	</dict>
+	<key>UILaunchStoryboardName</key>
+	<string>LaunchScreen</string>
+	<key>UIMainStoryboardFile</key>
+	<string>Main</string>
+	<key>UIRequiredDeviceCapabilities</key>
+	<array>
+		<string>armv7</string>
+	</array>
+	<key>UISupportedInterfaceOrientations</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+	</array>
+	<key>UISupportedInterfaceOrientations~ipad</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+		<string>UIInterfaceOrientationPortraitUpsideDown</string>
+		<string>UIInterfaceOrientationLandscapeLeft</string>
+		<string>UIInterfaceOrientationLandscapeRight</string>
+	</array>
+	<key>UIUserInterfaceStyle</key>
+	<string>Light</string>
+</dict>
+</plist>

Example/Example/SceneDelegate.swift

@@ -0,0 +1,67 @@
+//  MIT License
+
+//  Copyright (c) 2020 Haik Aslanyan
+
+//  Permission is hereby granted, free of charge, to any person obtaining a copy
+//  of this software and associated documentation files (the "Software"), to deal
+//  in the Software without restriction, including without limitation the rights
+//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+//  copies of the Software, and to permit persons to whom the Software is
+//  furnished to do so, subject to the following conditions:
+
+//  The above copyright notice and this permission notice shall be included in all
+//  copies or substantial portions of the Software.
+
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+//  SOFTWARE.
+
+import UIKit
+
+class SceneDelegate: UIResponder, UIWindowSceneDelegate {
+
+  var window: UIWindow?
+
+
+  func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
+    // Use this method to optionally configure and attach the UIWindow `window` to the provided UIWindowScene `scene`.
+    // If using a storyboard, the `window` property will automatically be initialized and attached to the scene.
+    // This delegate does not imply the connecting scene or session are new (see `application:configurationForConnectingSceneSession` instead).
+    guard let _ = (scene as? UIWindowScene) else { return }
+  }
+
+  func sceneDidDisconnect(_ scene: UIScene) {
+    // Called as the scene is being released by the system.
+    // This occurs shortly after the scene enters the background, or when its session is discarded.
+    // Release any resources associated with this scene that can be re-created the next time the scene connects.
+    // The scene may re-connect later, as its session was not neccessarily discarded (see `application:didDiscardSceneSessions` instead).
+  }
+
+  func sceneDidBecomeActive(_ scene: UIScene) {
+    // Called when the scene has moved from an inactive state to an active state.
+    // Use this method to restart any tasks that were paused (or not yet started) when the scene was inactive.
+  }
+
+  func sceneWillResignActive(_ scene: UIScene) {
+    // Called when the scene will move from an active state to an inactive state.
+    // This may occur due to temporary interruptions (ex. an incoming phone call).
+  }
+
+  func sceneWillEnterForeground(_ scene: UIScene) {
+    // Called as the scene transitions from the background to the foreground.
+    // Use this method to undo the changes made on entering the background.
+  }
+
+  func sceneDidEnterBackground(_ scene: UIScene) {
+    // Called as the scene transitions from the foreground to the background.
+    // Use this method to save data, release shared resources, and store enough scene-specific state information
+    // to restore the scene back to its current state.
+  }
+
+
+}
+

Example/Example/ViewController.swift

@@ -0,0 +1,159 @@
+//  MIT License
+
+//  Copyright (c) 2020 Haik Aslanyan
+
+//  Permission is hereby granted, free of charge, to any person obtaining a copy
+//  of this software and associated documentation files (the "Software"), to deal
+//  in the Software without restriction, including without limitation the rights
+//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+//  copies of the Software, and to permit persons to whom the Software is
+//  furnished to do so, subject to the following conditions:
+
+//  The above copyright notice and this permission notice shall be included in all
+//  copies or substantial portions of the Software.
+
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+//  SOFTWARE.
+
+import UIKit
+import RoundCode
+
+class ViewController: UIViewController {
+
+  @IBOutlet weak var imageView: UIImageView!
+  @IBOutlet weak var textField: UITextField!
+  @IBOutlet weak var messageLabel: UILabel!
+  var coder = RCCoder()
+  var image = RCImage(message: "")
+  let colors: [[UIColor]] = [[.orange, .magenta], [.systemPink, .systemTeal], [.systemTeal, .systemGreen], [.orange, .brown], [.purple, .cyan]]
+  var isScanningFromLibrary = false
+}
+
+extension ViewController {
+  
+  @IBAction func changeConfig(_ sender: Any) {
+    textField.text = ""
+    image.message = ""
+    imageView.image = try? coder.encode(image)
+    let vc = UIAlertController(title: "Select Configuration", message: nil, preferredStyle: .actionSheet)
+    let uuidAction = UIAlertAction(title: "UUID", style: .default) { _ in
+      self.coder = RCCoder(configuration: .uuidConfiguration)
+    }
+    let numericAction = UIAlertAction(title: "Numeric", style: .default) { _ in
+      self.coder = RCCoder(configuration: .numericConfiguration)
+    }
+    let shortAction = UIAlertAction(title: "Short", style: .default) { _ in
+      self.coder = RCCoder(configuration: .shortConfiguration)
+    }
+    let defaultAction = UIAlertAction(title: "Default", style: .default) { _ in
+      self.coder = RCCoder(configuration: .defaultConfiguration)
+    }
+    let cancelAction = UIAlertAction(title: "Cancel", style: .cancel)
+    vc.addAction(uuidAction)
+    vc.addAction(numericAction)
+    vc.addAction(shortAction)
+    vc.addAction(defaultAction)
+    vc.addAction(cancelAction)
+    present(vc, animated: true)
+  }
+  
+  
+  @IBAction func scanImage(_ sender: Any) {
+    isScanningFromLibrary = true
+    let vc = UIImagePickerController()
+    vc.sourceType = .photoLibrary
+    vc.allowsEditing = true
+    vc.delegate = self
+    present(vc, animated: true)
+  }
+  
+  
+  @IBAction func scan(_ sender: Any) {
+    let vc = RCCameraViewController()
+    coder.scanningMode  = .lightBackground
+    vc.coder = coder
+    vc.delegate = self
+    present(vc, animated: true)
+  }
+  
+  @IBAction func share(_ sender: Any) {
+    image.size = 1000
+    image.contentInsets = UIEdgeInsets(top: 50, left: 50, bottom: 50, right: 50)
+    let uiImage = try? coder.encode(image)
+    image.size = 300
+    image.contentInsets = UIEdgeInsets(top: 8, left: 8, bottom: 8, right: 8)
+    let vc = UIActivityViewController.init(activityItems: [uiImage!], applicationActivities: nil)
+    present(vc, animated: true)
+  }
+  
+  @IBAction func setImage(_ sender: Any) {
+    let vc = UIImagePickerController()
+    vc.sourceType = .photoLibrary
+    vc.allowsEditing = true
+    vc.delegate = self
+    present(vc, animated: true)
+  }
+  
+  @IBAction func setColor(_ sender: UISegmentedControl) {
+    image.tintColors = colors[sender.selectedSegmentIndex]
+    imageView.image = try? coder.encode(image)
+  }
+  
+  @IBAction func didType(_ sender: UITextField) {
+    image.message = sender.text ?? ""
+    imageView.image = try? coder.encode(image)
+  }
+}
+
+extension ViewController: UITextFieldDelegate {
+  func textFieldShouldReturn(_ textField: UITextField) -> Bool {
+    return textField.resignFirstResponder()
+  }
+  
+  func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
+    let newString = ((textField.text ?? "") as NSString).replacingCharacters(in: range, with: string) as String
+    let status = coder.validate(newString)
+    return status
+  }
+}
+
+extension ViewController: UINavigationControllerDelegate, UIImagePickerControllerDelegate {
+  
+  func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
+    let camImage = info[.editedImage] as! UIImage
+    if isScanningFromLibrary {
+      if let message = try? coder.decode(camImage) {
+        messageLabel.text = message
+        messageLabel.isHidden = false
+        DispatchQueue.main.asyncAfter(deadline: .now() + 3) {
+          self.messageLabel.isHidden = true
+        }
+      }
+    } else {
+      image.attachmentImage = camImage
+      imageView.image = try? coder.encode(image)
+    }
+    isScanningFromLibrary = false
+    picker.dismiss(animated: true)
+  }
+  
+  func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
+    isScanningFromLibrary = false
+    picker.dismiss(animated: true)
+  }
+}
+
+extension ViewController: RCCameraViewControllerDelegate {
+  func cameraViewController(didFinishScanning message: String) {
+    messageLabel.text = message
+    messageLabel.isHidden = false
+    DispatchQueue.main.asyncAfter(deadline: .now() + 3) {
+      self.messageLabel.isHidden = true
+    }
+  }
+}

README.md

@@ -5,10 +5,8 @@
 [![Twitter: @aslanyanhaik](https://img.shields.io/badge/Contact-Twitter-blue.svg?style=flat)](https://twitter.com/aslanyanhaik)
 
 
-
-RoundCode is a Facebook messenger like custom QR code with lots of customization. 
-
-In addition to encoder the RoundCode also includes convenient camera scanner and decoder.
+RoundCode is custom circular QR code with lots of customization. 
+Similar to Facebook messenger and Apple's App Clip Codes the RoundCode includes convenient camera scanner and decoder.
 
 <h3 align="center">
 <img src="appearance.png" alt="Different styles of RoundCode for iOS"/>
@@ -81,14 +79,14 @@ You can also decode a UIImage like this
 
 ```swift
 let coder = RCCoder()
-  do {
-    messageLabel.text = try coder.decode(UIImage(named: code)!)
-  } catch {
-    //handle errors
-  }
+do {
+  messageLabel.text = try coder.decode(UIImage(named: code)!)
+} catch {
+  //handle errors
+}
 ```
 
-### Appearance
+## Appearance
 
 You can change the appearance like this
 
@@ -100,10 +98,14 @@ image.size = 300
 image.gradientType = .linear(angle: CGFloat.pi)
 image.tintColors = [.red, .black]
 ```
+If image is on dark background you should change scanning mode to `darkBackground`
 
-⚠️ When choosing colors or transparent background you should keep in mind that decoder will detect the code on light background with dark colors ⚠️
+```swift
+let coder = RCCoder()
+coder.scanningMode = .darkBackground
+```
 
-### Advanced
+## Advanced coding configuration
 
 You can provide custom coding configuration in order to encode long text by reducing number of characters
 

RoundCode.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name             = 'RoundCode'
-  s.version          = '1.0.0'
+  s.version          = '1.3.0'
   s.summary          = 'Facebook messenger style custom barcode.'
   s.description      = <<-DESC
                      Encode and decode data into custom stylish barcode.

RoundCode.xcworkspace/contents.xcworkspacedata

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Workspace
+   version = "1.0">
+   <FileRef
+      location = "group:">
+   </FileRef>
+   <FileRef
+      location = "group:Example/Example.xcodeproj">
+   </FileRef>
+</Workspace>

RoundCode.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist

@@ -0,0 +1,8 @@
+<?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>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>

Sources/Internal/RCBitCoder.swift

@@ -70,7 +70,6 @@ extension RCBitCoder {
   
   
   func decode(_ bits: [RCBit]) throws -> String {
-    guard bits.contains(.one) else { return "" }
     //starting character to bits
     var startingIndexCharacter = String(repeating: "0", count: configuration.bitesPerSymbol)
     startingIndexCharacter += String(configuration.characters.firstIndex(of: configuration.version.startingCharacter)!, radix: 2)

Sources/Internal/RCConstants.swift

@@ -28,5 +28,6 @@ struct RCConstants {
   static let dotSizeScale: CGFloat = 0.08
   static let dotPatterns: [CGFloat] = [6, 4, 2]
   static let dotPointRange = (Float(1.3)...Float(2.5))
-  static let pixelThreshold = 180
+  static let lightBackgroundRange = UInt8(0)...UInt8(180)
+  static let darkBackgroundRange = UInt8(100)...UInt8(255)
 }

Sources/Internal/RCImageDecoder.swift

@@ -27,41 +27,24 @@ struct RCImageDecoder {
   internal let configuration: RCCoderConfiguration
   internal var size = 720
   internal var bytesPerRow = 720
-  internal var padding = 0
-  private var sectionSize: Int {
-    self.size / 5
-  }
+  internal var pixelThreshold = RCConstants.lightBackgroundRange
 }
 
 extension RCImageDecoder {
   func process(pointer: UnsafeMutablePointer<UInt8>) throws -> [RCBit] {
     let bufferData = UnsafeMutableBufferPointer<UInt8>(start: pointer, count: size * bytesPerRow)
     let data = PixelContainer(rows: bytesPerRow, items: bufferData)
-    var points = [CGPoint]()
-    for side in Side.allCases {
-      switch side {
-        case .left:
-          let point = try scanControlPoint(for: data, region: (padding, (size - sectionSize) / 2), side: side)
-          points.append(point)
-        case .top:
-          let point = try scanControlPoint(for: data, region: ((size - sectionSize) / 2, padding), side: side)
-          points.append(point)
-        case .right:
-          let point = try scanControlPoint(for: data, region: (size - sectionSize - padding, (size - sectionSize) / 2), side: side)
-          points.append(point)
-        case .bottom:
-          let point = try scanControlPoint(for: data, region: ((size - sectionSize) / 2, size - sectionSize - padding), side: side)
-          points.append(point)
-      }
-    }
-    let image = try fixPerspective(pointer, points: points)
-    let bits = decode(image)
+    let points = try scanControlPoints(for: data)
+    let transform = calculateTransform(from: points)
+    let mapper = RCPointMapper(transform: transform, size: size)
+    let locations = mapper.map(points: calculateBitLocations())
+    let bits = locations.map { pixelThreshold.contains(data[Int($0.x), Int($0.y)]) ? RCBit.one : RCBit.zero }
     return bits
   }
   
   func decode(_ image: UIImage) throws -> [RCBit] {
     let pixelData = UnsafeMutableRawPointer.allocate(byteCount: size * size, alignment: MemoryLayout<UInt8>.alignment)
-    let context = generateContext(data: pixelData, size: size, bytesPerRow: self.bytesPerRow)
+    let context = CGContext(data: pixelData, width: size, height: size, bitsPerComponent: 8, bytesPerRow: bytesPerRow, space: CGColorSpaceCreateDeviceGray(), bitmapInfo: CGImageAlphaInfo.none.rawValue)
     context?.draw(image.cgImage!, in: CGRect(origin: .zero, size: CGSize(width: size, height: size)))
     let bits = try process(pointer: pixelData.assumingMemoryBound(to: UInt8.self))
     pixelData.deallocate()
@@ -70,47 +53,66 @@ extension RCImageDecoder {
 }
 
 extension RCImageDecoder {
-  private func scanControlPoint(for data: PixelContainer, region: (x: Int, y: Int), side: Side) throws -> CGPoint {
-    
-    func scan(region: (x: Int, y: Int, size: Int), data: PixelContainer, coordinate: (Int) -> (x: Int, y: Int), comparison: (PixelPattern, (x: Int, y: Int)) -> Bool) -> [PixelPattern] {
-      var lastPattern = PixelPattern(bit: data[region.x, region.y] > RCConstants.pixelThreshold ? RCBit.zero : RCBit.one, x: region.x, y: region.y, count: 0)
-      var pixelPatterns = [lastPattern]
-      var count = 0
-      let maxSize = region.size * region.size
-      while count < maxSize {
-        let coordinate = coordinate(count)
-        let bit = data[coordinate.x, coordinate.y] > RCConstants.pixelThreshold ? RCBit.zero : RCBit.one
-        if comparison(lastPattern, coordinate), lastPattern.bit == bit {
-          lastPattern.count += 1
-          pixelPatterns[pixelPatterns.count - 1] = lastPattern
-        } else {
-          lastPattern = PixelPattern(bit: bit, x: coordinate.x, y: coordinate.y, count: 1)
-          pixelPatterns.append(lastPattern)
-        }
-        count += 1
+  private func scanControlPoints(for data: PixelContainer) throws -> [CGPoint] {
+    var horizontalPatterns = [PixelPattern]()
+    var verticalPatterns = [PixelPattern]()
+    var points = [CGPoint]()
+    for side in Side.allCases {
+      switch side {
+        case .left:
+          horizontalPatterns = scanPixelPattern(for: .horizontal, data: data)
+          points.append(try controlPoint(for: horizontalPatterns, side: side))
+        case .right:
+          points.append(try controlPoint(for: horizontalPatterns, side: side))
+        case .top:
+          verticalPatterns = scanPixelPattern(for: .vertical, data: data)
+          points.append(try controlPoint(for: verticalPatterns, side: side))
+        case .bottom:
+          points.append(try controlPoint(for: verticalPatterns, side: side))
       }
-      return pixelPatterns
     }
-    
-    let pixelPatterns: [PixelPattern]
-    switch side {
-      case .left, .right:
-        pixelPatterns = scan(region: (region.x, region.y, sectionSize), data: data, coordinate: { count in
-          let x = count % sectionSize + region.x
-          let y = count / sectionSize + region.y
-          return (x, y)
-        }, comparison: { (pattern, coordinate) in
-          return pattern.y == coordinate.y
-        })
-      case .top, .bottom:
-        pixelPatterns = scan(region: (region.x, region.y, sectionSize), data: data, coordinate: { count in
-          let x = count / sectionSize + region.x
-          let y = count % sectionSize + region.y
-          return (x, y)
-        }, comparison: { (pattern, coordinate) in
-          return pattern.x == coordinate.x
-        })
+    return points
+  }
+
+  private func scanPixelPattern(for mode: ScanMode, data: PixelContainer) -> [PixelPattern] {
+    var lastPattern = PixelPattern(bit: pixelThreshold.contains((data[0, 0])) ? RCBit.one : RCBit.zero, x: 0, y: 0, count: 0)
+    var pixelPatterns = [lastPattern]
+    var count = 0
+    let maxSize = size * size
+    switch mode {
+      case .horizontal:
+        while count < maxSize {
+          let x = count % size
+          let y = count / size
+          let bit = pixelThreshold.contains(data[x, y]) ? RCBit.one : RCBit.zero
+          if lastPattern.y == y, lastPattern.bit == bit {
+            lastPattern.count += 1
+            pixelPatterns[pixelPatterns.count - 1] = lastPattern
+          } else {
+            lastPattern = PixelPattern(bit: bit, x: x, y: y, count: 1)
+            pixelPatterns.append(lastPattern)
+          }
+          count += 1
+      }
+      case .vertical:
+        while count < maxSize {
+          let x = count / size
+          let y = count % size
+          let bit = pixelThreshold.contains(data[x, y]) ? RCBit.one : RCBit.zero
+          if lastPattern.x == x, lastPattern.bit == bit {
+            lastPattern.count += 1
+            pixelPatterns[pixelPatterns.count - 1] = lastPattern
+          } else {
+            lastPattern = PixelPattern(bit: bit, x: x, y: y, count: 1)
+            pixelPatterns.append(lastPattern)
+          }
+          count += 1
+      }
     }
+    return pixelPatterns
+  }
+  
+  private func controlPoint(for pixelPatterns: [PixelPattern], side: Side) throws -> CGPoint {
     let controlPoints = try pixelPatterns.withUnsafeBufferPointer { (pixelPatternsBuffer) -> [CGPoint] in
       var points = [CGPoint]()
       guard pixelPatternsBuffer.count >= 5 else { throw RCError.decoding }
@@ -162,43 +164,22 @@ extension RCImageDecoder {
       }
     }.first!
   }
-  
-  private func fixPerspective(_ data: UnsafeMutablePointer<UInt8>, points: [CGPoint]) throws -> CGImage {
-    guard let context = generateContext(data: data, size: size, bytesPerRow: bytesPerRow), let cgImage = context.makeImage() else {
-      throw RCError.decoding
-    }
-    let image = UIGraphicsImageRenderer(size: CGSize(width: CGFloat(size), height: CGFloat(size))).image { context in
-      let baseView = UIView(frame: context.format.bounds)
-      let imageView = UIImageView(frame: context.format.bounds)
-      baseView.addSubview(imageView)
-      imageView.image = UIImage(cgImage: cgImage)
-      imageView.layer.anchorPoint = .zero
-      imageView.layer.frame = context.format.bounds
-      let perspective = RCTransformation(points)
-      let destination = RCTransformation([CGPoint(x: context.format.bounds.minX, y: context.format.bounds.midY),
-                                          CGPoint(x: context.format.bounds.midX, y: context.format.bounds.minY),
-                                          CGPoint(x: context.format.bounds.midX, y: context.format.bounds.maxY),
-                                          CGPoint(x: context.format.bounds.maxX, y: context.format.bounds.midY)])
-      let transform = perspective.perspectiveTransform(to: destination)
-      imageView.transform3D = transform
-      baseView.drawHierarchy(in: context.format.bounds, afterScreenUpdates: true)
-    }
-    guard let renderImage = image.cgImage else {
-      throw RCError.decoding
-    }
-    return renderImage
+    
+  private func calculateTransform(from points: [CGPoint]) -> CATransform3D {
+    let perspective = RCTransformation(points)
+    let middleRect = CGRect(origin: .zero, size: CGSize(width: CGFloat(size), height: CGFloat(size)))
+    let destination = RCTransformation([CGPoint(x: middleRect.minX, y: middleRect.midY),
+                                        CGPoint(x: middleRect.midX, y: middleRect.minY),
+                                        CGPoint(x: middleRect.midX, y: middleRect.maxY),
+                                        CGPoint(x: middleRect.maxX, y: middleRect.midY)])
+    return perspective.perspectiveTransform(to: destination)
   }
   
-  private func decode(_ image: CGImage) -> [RCBit] {
-    let pixelData = UnsafeMutableRawPointer.allocate(byteCount: image.width * image.height, alignment: MemoryLayout<UInt8>.alignment)
-    let context = generateContext(data: pixelData, size: image.width, bytesPerRow: image.width)
-    context?.draw(image, in: CGRect(origin: .zero, size: CGSize(width: image.width, height: image.height)))
-    let buffer = UnsafeMutableBufferPointer<UInt8>(start: pixelData.assumingMemoryBound(to: UInt8.self), count: image.width * image.height)
-    let data = PixelContainer(rows: image.height, items: buffer)
-    let size = CGFloat(data.columns)
-    let lineWidth = CGFloat(image.height) * RCConstants.dotSizeScale / 5 //number of lines including spaces
-    let mainRadius = CGFloat(image.height) / 2
-    let startAngle = asin(CGFloat(image.height) * RCConstants.dotSizeScale / mainRadius)
+  private func calculateBitLocations() -> [CGPoint] {
+    let size = CGFloat(self.size)
+    let lineWidth = size * RCConstants.dotSizeScale / 5 //number of lines including spaces
+    let mainRadius = size / 2
+    let startAngle = asin(size * RCConstants.dotSizeScale / mainRadius)
     var points = [CGPoint]()
     let center = CGPoint(x: size / 2, y: size / 2)
     (0...3).forEach { offset in
@@ -214,15 +195,7 @@ extension RCImageDecoder {
         }
       }
     }
-    let bits = points.map { data[Int($0.x), Int($0.y)] > RCConstants.pixelThreshold ? RCBit.zero : RCBit.one }
-    pixelData.deallocate()
-    return bits
-  }
-}
-
-extension RCImageDecoder {
-  private func generateContext(data: UnsafeMutableRawPointer?, size: Int, bytesPerRow: Int) -> CGContext? {
-    return  CGContext(data: data, width: size, height: size, bitsPerComponent: 8, bytesPerRow: bytesPerRow, space: CGColorSpaceCreateDeviceGray(), bitmapInfo: CGImageAlphaInfo.none.rawValue)
+    return points
   }
 }
 
@@ -242,6 +215,11 @@ extension RCImageDecoder {
     case right
   }
   
+  enum ScanMode {
+    case horizontal
+    case vertical
+  }
+  
   final class PixelContainer {
     let rows: Int
     var columns: Int { data.count / rows }

Sources/Internal/RCPointMapper.swift

@@ -0,0 +1,55 @@
+//  MIT License
+
+//  Copyright (c) 2020 Haik Aslanyan
+
+//  Permission is hereby granted, free of charge, to any person obtaining a copy
+//  of this software and associated documentation files (the "Software"), to deal
+//  in the Software without restriction, including without limitation the rights
+//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+//  copies of the Software, and to permit persons to whom the Software is
+//  furnished to do so, subject to the following conditions:
+
+//  The above copyright notice and this permission notice shall be included in all
+//  copies or substantial portions of the Software.
+
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+//  SOFTWARE.
+
+import QuartzCore
+
+struct RCPointMapper {
+  
+  private var transform: CATransform3D
+  private let denominatorX: CGFloat
+  private let denominatorY: CGFloat
+  private let denominatorW: CGFloat
+  private let size: CGFloat
+  
+  init(transform: CATransform3D, size: Int) {
+    let translateDueToDisposition = CATransform3DMakeTranslation(-CGFloat(size) / 2, -CGFloat(size) / 2, 0)
+    self.transform = CATransform3DConcat(transform, translateDueToDisposition)
+    self.size = CGFloat(size)
+    self.denominatorX = transform.m12 * transform.m21 - transform.m11  * transform.m22 + transform.m14 * transform.m22 * transform.m41 - transform.m12 * transform.m24 * transform.m41 - transform.m14 * transform.m21 * transform.m42 + transform.m11 * transform.m24 * transform.m42
+    self.denominatorY = -transform.m12 * transform.m21 + transform.m11 * transform.m22 - transform.m14 * transform.m22 * transform.m41 + transform.m12 * transform.m24 * transform.m41 + transform.m14 * transform.m21 * transform.m42 - transform.m11 * transform.m24 * transform.m42
+    self.denominatorW = transform.m12 * transform.m21 - transform.m11 * transform.m22 + transform.m14 * transform.m22 * transform.m41 - transform.m12 * transform.m24 * transform.m41 - transform.m14 * transform.m21 * transform.m42 + transform.m11 * transform.m24 * transform.m42
+  }
+  
+  func map(points: [CGPoint]) -> [CGPoint] {
+    return points.map { point in
+      let modelPoint =  CGPoint(x: (point.x * 2.0 - size) / 2.0, y: (point.y * 2.0 - size) / 2.0)
+      let x = modelPoint.x
+      let y = modelPoint.y
+      let xp: CGFloat = (transform.m22 * transform.m41 - transform.m21 * transform.m42 - transform.m22 * x + transform.m24 * transform.m42 * x + transform.m21 * y - transform.m24 * transform.m41 * y) / denominatorX
+      let yp: CGFloat = (-transform.m11 * transform.m42 + transform.m12 * (transform.m41 - x) + transform.m14 * transform.m42 * x + transform.m11 * y - transform.m14 * transform.m41 * y) / denominatorY
+      let wp: CGFloat = (transform.m12 * transform.m21 - transform.m11 * transform.m22 + transform.m14 * transform.m22 * x - transform.m12 * transform.m24 * x - transform.m14 * transform.m21 * y + transform.m11 * transform.m24 * y) / denominatorW
+      let actualPoint = CGPoint(x: xp / wp, y: yp / wp)
+      let isOutOfBounds = !(0...size).contains(actualPoint.x) || !(0...size).contains(actualPoint.y)
+      return isOutOfBounds ? .zero : actualPoint
+    }
+  }
+}

Sources/Public/RCCameraViewController.swift

@@ -23,7 +23,7 @@
 import UIKit
 import AVFoundation
 
-public final class RCCameraViewController: UIViewController, UIImagePickerControllerDelegate {
+public final class RCCameraViewController: UIViewController {
   
   //MARK: Public properties
   public weak var delegate: RCCameraViewControllerDelegate?
@@ -42,8 +42,9 @@ public final class RCCameraViewController: UIViewController, UIImagePickerContro
   private var circleLayer = CAShapeLayer()
   private lazy var cameraView: UIView = {
     let cameraView = UIView()
-    cameraView.backgroundColor = .black
+    cameraView.backgroundColor = .clear
     self.view.addSubview(cameraView)
+    cameraView.translatesAutoresizingMaskIntoConstraints = false
     cameraView.leadingAnchor.constraint(equalTo: self.view.leadingAnchor, constant: 0).isActive = true
     cameraView.trailingAnchor.constraint(equalTo: self.view.trailingAnchor, constant: 0).isActive = true
     cameraView.topAnchor.constraint(equalTo: self.view.topAnchor, constant: 0).isActive = true
@@ -112,7 +113,6 @@ public extension RCCameraViewController {
     super.viewDidLayoutSubviews()
     configureMaskLayer()
     videoPreviewLayer?.frame = view.bounds
-    calculateScanArea()
   }
 }
 
@@ -156,12 +156,11 @@ extension RCCameraViewController {
     guard let captureDevice = AVCaptureDevice.default(for: .video) else { return }
     do {
       captureSession.sessionPreset = .hd1280x720
-      calculateScanArea()
       let input = try AVCaptureDeviceInput(device: captureDevice)
       input.device.activeVideoMaxFrameDuration = CMTimeMake(value: 1, timescale: 30)
       captureSession.addInput(input)
       let videoOutput = AVCaptureVideoDataOutput()
-      videoOutput.setSampleBufferDelegate(self, queue: .main)
+      videoOutput.setSampleBufferDelegate(self, queue: DispatchQueue.global(qos: .userInteractive))
       videoOutput.videoSettings = [kCVPixelBufferPixelFormatTypeKey as String: NSNumber(value: kCVPixelFormatType_420YpCbCr8BiPlanarFullRange)]
       captureSession.addOutput(videoOutput)
     } catch {
@@ -169,12 +168,6 @@ extension RCCameraViewController {
     }
   }
   
-  private func calculateScanArea() {
-    let actualWidth = view.frame.height / 16 * 9
-    let sideArea = (actualWidth - view.frame.width * 0.9) / 2
-    coder.imageDecoder.padding = Int(sideArea / actualWidth * 720)
-  }
-  
   private func configureVideoPreview(orientation: AVCaptureVideoOrientation = .portrait) {
     videoPreviewLayer?.removeFromSuperlayer()
     videoPreviewLayer = AVCaptureVideoPreviewLayer(session: captureSession)
@@ -204,8 +197,10 @@ extension RCCameraViewController: AVCaptureVideoDataOutputSampleBufferDelegate {
     coder.imageDecoder.bytesPerRow = bytesPerRow
     if let message = try? coder.decode(buffer: lumaCopy.assumingMemoryBound(to: UInt8.self)) {
       captureSession.stopRunning()
-      delegate?.cameraViewController(didFinishScanning: message)
-      dismiss(animated: true)
+      DispatchQueue.main.async {[weak self] in
+        self?.delegate?.cameraViewController(didFinishScanning: message)
+        self?.dismiss(animated: true)
+      }
     }
     lumaCopy.deallocate()
     CVPixelBufferUnlockBaseAddress(pixelBuffer, .readOnly)

Sources/Public/RCCoder.swift

@@ -25,6 +25,11 @@ import UIKit
 public final class RCCoder {
   
   public let configuration: RCCoderConfiguration
+  public var scanningMode = ScanningMode.lightBackground {
+    didSet {
+      imageDecoder.pixelThreshold = scanningMode == .lightBackground ? RCConstants.lightBackgroundRange : RCConstants.darkBackgroundRange
+    }
+  }
   internal lazy var imageDecoder = RCImageDecoder(configuration: self.configuration)
   internal lazy var imageEncoder = RCImageEncoder(configuration: self.configuration)
   internal lazy var bitCoder = RCBitCoder(configuration: self.configuration)
@@ -44,7 +49,6 @@ public extension RCCoder {
   func decode(_ image: UIImage) throws -> String {
     guard image.size.width == image.size.height else { throw RCError.wrongImageSize }
     imageDecoder.size = image.cgImage!.height
-    imageDecoder.padding = 0
     imageDecoder.bytesPerRow = image.cgImage!.height
     let bits = try imageDecoder.decode(image)
     let message = try bitCoder.decode(bits)
@@ -56,6 +60,13 @@ public extension RCCoder {
   }
 }
 
+public extension RCCoder {
+  enum ScanningMode {
+    case lightBackground
+    case darkBackground
+  }
+}
+
 extension RCCoder {
   
   func decode(buffer: UnsafeMutablePointer<UInt8>) throws -> String {
@@ -64,3 +75,4 @@ extension RCCoder {
     return message
   }
 }
+

Sources/Public/RCCoderConfiguration.swift

@@ -24,13 +24,12 @@ import Foundation
 
 public struct RCCoderConfiguration {
   
-  public let version: Version
+  public let version = Version.v1
   public let maxMessageCount: Int
   public let bitesPerSymbol: Int
   public let characters: [Character]
   
-  public init(version: Version = .v1, characters: String) {
-    self.version = version
+  public init(characters: String) {
     var charactersArray = characters.map({$0})
     charactersArray.append(version.startingCharacter)
     charactersArray.append(contentsOf: version.emptyCharacters)