Add projects

Examples/Calculator/.gitignore

@@ -0,0 +1,68 @@
+# Xcode
+#
+# gitignore contributors: remember to update Global/Xcode.gitignore, Objective-C.gitignore & Swift.gitignore
+
+## Build generated
+build/
+DerivedData/
+
+## Various settings
+*.pbxuser
+!default.pbxuser
+*.mode1v3
+!default.mode1v3
+*.mode2v3
+!default.mode2v3
+*.perspectivev3
+!default.perspectivev3
+xcuserdata/
+
+## Other
+*.moved-aside
+*.xccheckout
+*.xcscmblueprint
+
+## Obj-C/Swift specific
+*.hmap
+*.ipa
+*.dSYM.zip
+*.dSYM
+
+## Playgrounds
+timeline.xctimeline
+playground.xcworkspace
+
+# Swift Package Manager
+#
+# Add this line if you want to avoid checking in source code from Swift Package Manager dependencies.
+# Packages/
+# Package.pins
+# Package.resolved
+.build/
+
+# CocoaPods
+#
+# We recommend against adding the Pods directory to your .gitignore. However
+# you should judge for yourself, the pros and cons are mentioned at:
+# https://guides.cocoapods.org/using/using-cocoapods.html#should-i-check-the-pods-directory-into-source-control
+#
+# Pods/
+
+# Carthage
+#
+# Add this line if you want to avoid checking in source code from Carthage dependencies.
+# Carthage/Checkouts
+
+Carthage/Build
+
+# fastlane
+#
+# It is recommended to not store the screenshots in the git repo. Instead, use fastlane to re-generate the
+# screenshots whenever they are needed.
+# For more information about the recommended setup visit:
+# https://docs.fastlane.tools/best-practices/source-control/#source-control
+
+fastlane/report.xml
+fastlane/Preview.html
+fastlane/screenshots/**/*.png
+fastlane/test_output

Examples/Calculator/Calculator/Calculator.xcodeproj/project.pbxproj

@@ -0,0 +1,349 @@
+// !$*UTF8*$!
+{
+	archiveVersion = 1;
+	classes = {
+	};
+	objectVersion = 50;
+	objects = {
+
+/* Begin PBXBuildFile section */
+		FB5DD72922A8D8D000642035 /* AppDelegate.swift in Sources */ = {isa = PBXBuildFile; fileRef = FB5DD72822A8D8D000642035 /* AppDelegate.swift */; };
+		FB5DD72B22A8D8D000642035 /* SceneDelegate.swift in Sources */ = {isa = PBXBuildFile; fileRef = FB5DD72A22A8D8D000642035 /* SceneDelegate.swift */; };
+		FB5DD72D22A8D8D000642035 /* Calculator.swift in Sources */ = {isa = PBXBuildFile; fileRef = FB5DD72C22A8D8D000642035 /* Calculator.swift */; };
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+		FB5DD73522A8D8D100642035 /* LaunchScreen.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = FB5DD73322A8D8D100642035 /* LaunchScreen.storyboard */; };
+		FB5DD73D22A8D9C800642035 /* CalculatorBrain.swift in Sources */ = {isa = PBXBuildFile; fileRef = FB5DD73C22A8D9C800642035 /* CalculatorBrain.swift */; };
+/* End PBXBuildFile section */
+
+/* Begin PBXFileReference section */
+		FB5DD72522A8D8D000642035 /* Calculator.app */ = {isa = PBXFileReference; explicitFileType = wrapper.application; includeInIndex = 0; path = Calculator.app; sourceTree = BUILT_PRODUCTS_DIR; };
+		FB5DD72822A8D8D000642035 /* AppDelegate.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AppDelegate.swift; sourceTree = "<group>"; };
+		FB5DD72A22A8D8D000642035 /* SceneDelegate.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SceneDelegate.swift; sourceTree = "<group>"; };
+		FB5DD72C22A8D8D000642035 /* Calculator.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Calculator.swift; sourceTree = "<group>"; };
+		FB5DD72E22A8D8D100642035 /* Assets.xcassets */ = {isa = PBXFileReference; lastKnownFileType = folder.assetcatalog; path = Assets.xcassets; sourceTree = "<group>"; };
+		FB5DD73122A8D8D100642035 /* Preview Assets.xcassets */ = {isa = PBXFileReference; lastKnownFileType = folder.assetcatalog; path = "Preview Assets.xcassets"; sourceTree = "<group>"; };
+		FB5DD73422A8D8D100642035 /* Base */ = {isa = PBXFileReference; lastKnownFileType = file.storyboard; name = Base; path = Base.lproj/LaunchScreen.storyboard; sourceTree = "<group>"; };
+		FB5DD73622A8D8D100642035 /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
+		FB5DD73C22A8D9C800642035 /* CalculatorBrain.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = CalculatorBrain.swift; sourceTree = "<group>"; };
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+		FB5DD72222A8D8D000642035 /* Frameworks */ = {
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+			files = (
+			);
+			runOnlyForDeploymentPostprocessing = 0;
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+/* End PBXFrameworksBuildPhase section */
+
+/* Begin PBXGroup section */
+		FB5DD71C22A8D8D000642035 = {
+			isa = PBXGroup;
+			children = (
+				FB5DD72722A8D8D000642035 /* Calculator */,
+				FB5DD72622A8D8D000642035 /* Products */,
+			);
+			sourceTree = "<group>";
+		};
+		FB5DD72622A8D8D000642035 /* Products */ = {
+			isa = PBXGroup;
+			children = (
+				FB5DD72522A8D8D000642035 /* Calculator.app */,
+			);
+			name = Products;
+			sourceTree = "<group>";
+		};
+		FB5DD72722A8D8D000642035 /* Calculator */ = {
+			isa = PBXGroup;
+			children = (
+				FB5DD72822A8D8D000642035 /* AppDelegate.swift */,
+				FB5DD72A22A8D8D000642035 /* SceneDelegate.swift */,
+				FB5DD72C22A8D8D000642035 /* Calculator.swift */,
+				FB5DD73C22A8D9C800642035 /* CalculatorBrain.swift */,
+				FB5DD72E22A8D8D100642035 /* Assets.xcassets */,
+				FB5DD73322A8D8D100642035 /* LaunchScreen.storyboard */,
+				FB5DD73622A8D8D100642035 /* Info.plist */,
+				FB5DD73022A8D8D100642035 /* Preview Content */,
+			);
+			path = Calculator;
+			sourceTree = "<group>";
+		};
+		FB5DD73022A8D8D100642035 /* Preview Content */ = {
+			isa = PBXGroup;
+			children = (
+				FB5DD73122A8D8D100642035 /* Preview Assets.xcassets */,
+			);
+			path = "Preview Content";
+			sourceTree = "<group>";
+		};
+/* End PBXGroup section */
+
+/* Begin PBXNativeTarget section */
+		FB5DD72422A8D8D000642035 /* Calculator */ = {
+			isa = PBXNativeTarget;
+			buildConfigurationList = FB5DD73922A8D8D100642035 /* Build configuration list for PBXNativeTarget "Calculator" */;
+			buildPhases = (
+				FB5DD72122A8D8D000642035 /* Sources */,
+				FB5DD72222A8D8D000642035 /* Frameworks */,
+				FB5DD72322A8D8D000642035 /* Resources */,
+			);
+			buildRules = (
+			);
+			dependencies = (
+			);
+			name = Calculator;
+			productName = Calculator;
+			productReference = FB5DD72522A8D8D000642035 /* Calculator.app */;
+			productType = "com.apple.product-type.application";
+		};
+/* End PBXNativeTarget section */
+
+/* Begin PBXProject section */
+		FB5DD71D22A8D8D000642035 /* Project object */ = {
+			isa = PBXProject;
+			attributes = {
+				LastSwiftUpdateCheck = 1100;
+				LastUpgradeCheck = 1100;
+				ORGANIZATIONNAME = NSHotchner;
+				TargetAttributes = {
+					FB5DD72422A8D8D000642035 = {
+						CreatedOnToolsVersion = 11.0;
+					};
+				};
+			};
+			buildConfigurationList = FB5DD72022A8D8D000642035 /* Build configuration list for PBXProject "Calculator" */;
+			compatibilityVersion = "Xcode 9.3";
+			developmentRegion = en;
+			hasScannedForEncodings = 0;
+			knownRegions = (
+				en,
+				Base,
+			);
+			mainGroup = FB5DD71C22A8D8D000642035;
+			productRefGroup = FB5DD72622A8D8D000642035 /* Products */;
+			projectDirPath = "";
+			projectRoot = "";
+			targets = (
+				FB5DD72422A8D8D000642035 /* Calculator */,
+			);
+		};
+/* End PBXProject section */
+
+/* Begin PBXResourcesBuildPhase section */
+		FB5DD72322A8D8D000642035 /* Resources */ = {
+			isa = PBXResourcesBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+				FB5DD73522A8D8D100642035 /* LaunchScreen.storyboard in Resources */,
+				FB5DD73222A8D8D100642035 /* Preview Assets.xcassets in Resources */,
+				FB5DD72F22A8D8D100642035 /* Assets.xcassets in Resources */,
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+		};
+/* End PBXResourcesBuildPhase section */
+
+/* Begin PBXSourcesBuildPhase section */
+		FB5DD72122A8D8D000642035 /* Sources */ = {
+			isa = PBXSourcesBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+				FB5DD72922A8D8D000642035 /* AppDelegate.swift in Sources */,
+				FB5DD72B22A8D8D000642035 /* SceneDelegate.swift in Sources */,
+				FB5DD73D22A8D9C800642035 /* CalculatorBrain.swift in Sources */,
+				FB5DD72D22A8D8D000642035 /* Calculator.swift in Sources */,
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+		};
+/* End PBXSourcesBuildPhase section */
+
+/* Begin PBXVariantGroup section */
+		FB5DD73322A8D8D100642035 /* LaunchScreen.storyboard */ = {
+			isa = PBXVariantGroup;
+			children = (
+				FB5DD73422A8D8D100642035 /* Base */,
+			);
+			name = LaunchScreen.storyboard;
+			sourceTree = "<group>";
+		};
+/* End PBXVariantGroup section */
+
+/* Begin XCBuildConfiguration section */
+		FB5DD73722A8D8D100642035 /* 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 = 13.0;
+				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;
+		};
+		FB5DD73822A8D8D100642035 /* 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 = 13.0;
+				MTL_ENABLE_DEBUG_INFO = NO;
+				MTL_FAST_MATH = YES;
+				SDKROOT = iphoneos;
+				SWIFT_COMPILATION_MODE = wholemodule;
+				SWIFT_OPTIMIZATION_LEVEL = "-O";
+				VALIDATE_PRODUCT = YES;
+			};
+			name = Release;
+		};
+		FB5DD73A22A8D8D100642035 /* Debug */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
+				CODE_SIGN_STYLE = Automatic;
+				DEVELOPMENT_ASSET_PATHS = "Calculator/Preview\\ Content";
+				ENABLE_PREVIEWS = YES;
+				INFOPLIST_FILE = Calculator/Info.plist;
+				LD_RUNPATH_SEARCH_PATHS = (
+					"$(inherited)",
+					"@executable_path/Frameworks",
+				);
+				PRODUCT_BUNDLE_IDENTIFIER = hotchner.tk.Calculator;
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				SWIFT_VERSION = 5.0;
+				TARGETED_DEVICE_FAMILY = "1,2";
+			};
+			name = Debug;
+		};
+		FB5DD73B22A8D8D100642035 /* Release */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
+				CODE_SIGN_STYLE = Automatic;
+				DEVELOPMENT_ASSET_PATHS = "Calculator/Preview\\ Content";
+				ENABLE_PREVIEWS = YES;
+				INFOPLIST_FILE = Calculator/Info.plist;
+				LD_RUNPATH_SEARCH_PATHS = (
+					"$(inherited)",
+					"@executable_path/Frameworks",
+				);
+				PRODUCT_BUNDLE_IDENTIFIER = hotchner.tk.Calculator;
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				SWIFT_VERSION = 5.0;
+				TARGETED_DEVICE_FAMILY = "1,2";
+			};
+			name = Release;
+		};
+/* End XCBuildConfiguration section */
+
+/* Begin XCConfigurationList section */
+		FB5DD72022A8D8D000642035 /* Build configuration list for PBXProject "Calculator" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				FB5DD73722A8D8D100642035 /* Debug */,
+				FB5DD73822A8D8D100642035 /* Release */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
+		FB5DD73922A8D8D100642035 /* Build configuration list for PBXNativeTarget "Calculator" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				FB5DD73A22A8D8D100642035 /* Debug */,
+				FB5DD73B22A8D8D100642035 /* Release */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
+/* End XCConfigurationList section */
+	};
+	rootObject = FB5DD71D22A8D8D000642035 /* Project object */;
+}

Examples/Calculator/Calculator/Calculator.xcodeproj/project.xcworkspace/contents.xcworkspacedata

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

Examples/Calculator/Calculator/Calculator.xcodeproj/project.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>

Examples/Calculator/Calculator/Calculator/AppDelegate.swift

@@ -0,0 +1,41 @@
+//
+//  AppDelegate.swift
+//  Calculator
+//
+//  Created by 马红奇 on 2019/6/6.
+//  Copyright © 2019 NSHotchner. All rights reserved.
+//
+
+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
+  }
+
+  func applicationWillTerminate(_ application: UIApplication) {
+    // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
+  }
+
+  // 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.
+  }
+
+
+}
+

Examples/Calculator/Calculator/Calculator/Assets.xcassets/AppIcon.appiconset/Contents.json

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

Examples/Calculator/Calculator/Calculator/Assets.xcassets/Contents.json

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

Examples/Calculator/Calculator/Calculator/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>

Examples/Calculator/Calculator/Calculator/Calculator.swift

@@ -0,0 +1,96 @@
+//
+//  Calculator.swift
+//  Calculator
+//
+//  Created by 马红奇 on 2019/6/6.
+//  Copyright © 2019 NSHotchner. All rights reserved.
+//
+
+import SwiftUI
+
+struct Calculator: View {
+  @State private var userIsInTheMiddleOfTyping = false
+  @State private var display = "0"
+  @State private var brain = CalculatorBrain()
+
+  let data = [["+", "−", "÷", "×"],
+              ["π", "7", "8", "9"],
+              ["√", "4", "5", "6"],
+              ["cos", "1", "2", "3"],
+              ["±", ".", "0", "="]]
+  
+  var body: some View {
+    let margin: CGFloat = 10
+    return VStack(alignment: .center) {
+      HStack {
+        Spacer()
+        
+        Text(display)
+          .foregroundColor(Color(red: 231 / 255.0, green: 76 / 255.0, blue: 60 / 255.0))
+          .font(.largeTitle)
+          .frame(height: 50)
+        }
+        .padding(margin)
+      
+      VStack(alignment: .center, spacing: margin) {
+        ForEach(data.identified(by: \.description)) { items in
+          HStack(alignment: .center, spacing: margin) {
+            ForEach(items.identified(by: \.description)) { item in
+              Text(item)
+                .font(.title)
+                .bold()
+                .color(Color.blue)
+                .frame(minWidth: 0, maxWidth: .infinity, minHeight: 0, maxHeight: .infinity)
+                .background(Color(red: 234 / 255.0, green: 240 / 255.0, blue: 241 / 255.0))
+                .tapAction {
+                  self.touchAction(item)
+              }
+            }
+          }
+        }
+        }
+        .padding(EdgeInsets(top: 0, leading: margin, bottom: 0, trailing: margin))
+      }
+      .frame(minWidth: 0, maxWidth: .infinity, minHeight: 0, maxHeight: .infinity)
+  }
+  
+  private func touchAction(_ symbol: String) {
+    if Int(symbol) != nil || symbol == "." {
+      touchDigit(symbol)
+    } else {
+      performOperation(symbol)
+    }
+  }
+  
+  private func touchDigit(_ digit: String) {
+    print(#function)
+    if userIsInTheMiddleOfTyping {
+      display += digit
+    } else {
+      display = digit
+      userIsInTheMiddleOfTyping = true
+    }
+  }
+  
+  private func performOperation(_ symbol: String) {
+    print(#function)
+    if userIsInTheMiddleOfTyping {
+      brain.setOperand(Double(display)!)
+      userIsInTheMiddleOfTyping = false
+    }
+    
+    brain.performOperation(symbol)
+    
+    if let result = brain.result {
+      display = String(result)
+    }
+  }
+}
+
+#if DEBUG
+struct Calculator_Previews : PreviewProvider {
+  static var previews: some View {
+    Calculator()
+  }
+}
+#endif

Examples/Calculator/Calculator/Calculator/CalculatorBrain.swift

@@ -0,0 +1,96 @@
+//
+//  CalculatorBrain.swift
+//  Calculator
+//
+//  Created by 马红奇 on 2019/6/6.
+//  Copyright © 2019 NSHotchner. All rights reserved.
+//  from class
+
+import Foundation
+
+struct CalculatorBrain {
+  
+  // optional on initialization = not set
+  private var accumulator: Double?
+  
+  // private enum specifying operation types
+  // with an associated value
+  private enum Operation {
+    case constant(Double)
+    case unary((Double) -> Double)
+    case binary((Double,Double) -> Double)
+    case equals
+  }
+  
+  // private extensible dictionary of operations with closures
+  private var operations: Dictionary<String,Operation> = [
+    "π" : Operation.constant(Double.pi),
+    "e" : Operation.constant(M_E),
+    "√" : Operation.unary(sqrt),
+    "cos" : Operation.unary(cos),
+    "±" : Operation.unary({ -$0 }),
+    "×" : Operation.binary({ $0 * $1 }),
+    "÷" : Operation.binary({ $0 / $1 }),
+    "+" : Operation.binary({ $0 + $1 }),
+    "−" : Operation.binary({ $0 - $1 }),
+    "=" : Operation.equals
+  ]
+  
+  mutating func performOperation(_ symbol: String) {
+    if let operation = operations[symbol] {
+      switch operation {
+      case .constant(let value):
+        accumulator = value
+      case .unary(let f):
+        if accumulator != nil {
+          accumulator = f(accumulator!)
+        }
+      case .binary(let f):
+        if accumulator != nil {
+          pendingBinaryOperation = PendingBinaryOperation(function: f, firstOperand: accumulator!)
+          accumulator = nil
+        }
+      case .equals:
+        performPendingBinaryOperation()
+      }
+    } else {
+      print("wrong operation symbol")
+    }
+  }
+  
+  // Private mutating func for performing pending binary operations
+  mutating func performPendingBinaryOperation() {
+    if pendingBinaryOperation != nil && accumulator != nil {
+      accumulator = pendingBinaryOperation!.perform(with: accumulator!)
+      pendingBinaryOperation = nil
+    }
+  }
+  
+  // Private optional Pending Binary Operation
+  private var pendingBinaryOperation: PendingBinaryOperation?
+  
+  // embedded private struct to support binary operations
+  // with a constant function and pending first operand
+  // doesn't need mutating since its just returning a value
+  private struct PendingBinaryOperation {
+    let function: (Double, Double) -> Double
+    let firstOperand: Double
+    
+    func perform(with secondOperand: Double) -> Double {
+      return function(firstOperand, secondOperand)
+    }
+  }
+  
+  // mark method as mutating in order to assign to property
+  mutating func setOperand(_ operand: Double) {
+    accumulator = operand
+  }
+  
+  // return an optional since the accumulator can be not set
+  var result: Double? {
+    get {
+      return accumulator
+    }
+  }
+  
+}

Examples/Calculator/Calculator/Calculator/Info.plist

@@ -0,0 +1,62 @@
+<?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>$(PRODUCT_BUNDLE_PACKAGE_TYPE)</string>
+	<key>CFBundleShortVersionString</key>
+	<string>1.0</string>
+	<key>CFBundleVersion</key>
+	<string>1</string>
+	<key>LSRequiresIPhoneOS</key>
+	<true/>
+	<key>UIApplicationSceneManifest</key>
+	<dict>
+		<key>UIApplicationSupportsMultipleScenes</key>
+		<false/>
+		<key>UISceneConfigurations</key>
+		<dict>
+			<key>UIWindowSceneSessionRoleApplication</key>
+			<array>
+				<dict>
+					<key>UILaunchStoryboardName</key>
+					<string>LaunchScreen</string>
+					<key>UISceneConfigurationName</key>
+					<string>Default Configuration</string>
+					<key>UISceneDelegateClassName</key>
+					<string>$(PRODUCT_MODULE_NAME).SceneDelegate</string>
+				</dict>
+			</array>
+		</dict>
+	</dict>
+	<key>UILaunchStoryboardName</key>
+	<string>LaunchScreen</string>
+	<key>UIRequiredDeviceCapabilities</key>
+	<array>
+		<string>armv7</string>
+	</array>
+	<key>UISupportedInterfaceOrientations</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+		<string>UIInterfaceOrientationLandscapeLeft</string>
+		<string>UIInterfaceOrientationLandscapeRight</string>
+	</array>
+	<key>UISupportedInterfaceOrientations~ipad</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+		<string>UIInterfaceOrientationPortraitUpsideDown</string>
+		<string>UIInterfaceOrientationLandscapeLeft</string>
+		<string>UIInterfaceOrientationLandscapeRight</string>
+	</array>
+</dict>
+</plist>

Examples/Calculator/Calculator/Calculator/Preview Content/Preview Assets.xcassets/Contents.json

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

Examples/Calculator/Calculator/Calculator/SceneDelegate.swift

@@ -0,0 +1,59 @@
+//
+//  SceneDelegate.swift
+//  Calculator
+//
+//  Created by 马红奇 on 2019/6/6.
+//  Copyright © 2019 NSHotchner. All rights reserved.
+//
+
+import UIKit
+import SwiftUI
+
+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).
+
+    // Use a UIHostingController as window root view controller
+    let window = UIWindow(frame: UIScreen.main.bounds)
+    window.rootViewController = UIHostingController(rootView: Calculator())
+    self.window = window
+    window.makeKeyAndVisible()
+  }
+
+  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.
+  }
+
+
+}
+

Examples/Calculator/LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2019 hotchner
+
+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.

Examples/Calculator/README.md

@@ -0,0 +1,11 @@
+# SwiftUICalculator
+
+SwiftUI 实现的计算器
+
+<img width="25%" height="25%" src="screenShots/1.png"/> <img width="50%" height="50%" src="screenShots/2.png"/>
+
+## Requirements
+
+* Xcode 11 Beta
+* Swift 5.1
+* iOS 13.0