[PlaygroundSupport] Migrated the PlaygroundSupport framework and its tests to Swift 4.2.

This is for <rdar://problem/45676453>.

Author: cwakamo

PlaygroundSupport/PlaygroundSupport.xcodeproj/project.pbxproj

@@ -832,6 +832,24 @@
 						CreatedOnToolsVersion = 8.0;
 						ProvisioningStyle = Automatic;
 					};
+					A8318F8F1CF603630015809A = {
+						LastSwiftMigration = 1010;
+					};
+					A8318FA21CF6036E0015809A = {
+						LastSwiftMigration = 1010;
+					};
+					A8318FB41CF603790015809A = {
+						LastSwiftMigration = 1010;
+					};
+					A8318FF51CF607C00015809A = {
+						LastSwiftMigration = 1010;
+					};
+					A83190031CF607C50015809A = {
+						LastSwiftMigration = 1010;
+					};
+					A83190111CF607C70015809A = {
+						LastSwiftMigration = 1010;
+					};
 					A8FBD6A21C74FEE6005B5982 = {
 						CreatedOnToolsVersion = 7.3;
 					};
@@ -1517,6 +1535,7 @@
 				SDKROOT = macosx;
 				STRIP_SWIFT_SYMBOLS = NO;
 				SWIFT_INSTALL_OBJC_HEADER = NO;
+				SWIFT_VERSION = 4.2;
 			};
 			name = Debug;
 		};
@@ -1538,6 +1557,7 @@
 				SDKROOT = macosx;
 				STRIP_SWIFT_SYMBOLS = NO;
 				SWIFT_INSTALL_OBJC_HEADER = NO;
+				SWIFT_VERSION = 4.2;
 			};
 			name = Release;
 		};
@@ -1584,6 +1604,7 @@
 				STRIP_SWIFT_SYMBOLS = NO;
 				SUPPORTED_PLATFORMS = "iphonesimulator iphoneos";
 				SWIFT_INSTALL_OBJC_HEADER = NO;
+				SWIFT_VERSION = 4.2;
 				VALID_ARCHS = x86_64;
 				WRAPPER_EXTENSION = framework;
 			};
@@ -1626,6 +1647,7 @@
 				STRIP_SWIFT_SYMBOLS = NO;
 				SUPPORTED_PLATFORMS = "iphonesimulator iphoneos";
 				SWIFT_INSTALL_OBJC_HEADER = NO;
+				SWIFT_VERSION = 4.2;
 				VALIDATE_PRODUCT = YES;
 				VALID_ARCHS = x86_64;
 				WRAPPER_EXTENSION = framework;
@@ -1675,6 +1697,7 @@
 				STRIP_SWIFT_SYMBOLS = NO;
 				SUPPORTED_PLATFORMS = "appletvsimulator appletvos";
 				SWIFT_INSTALL_OBJC_HEADER = NO;
+				SWIFT_VERSION = 4.2;
 				VALID_ARCHS = x86_64;
 				WRAPPER_EXTENSION = framework;
 			};
@@ -1717,6 +1740,7 @@
 				STRIP_SWIFT_SYMBOLS = NO;
 				SUPPORTED_PLATFORMS = "appletvsimulator appletvos";
 				SWIFT_INSTALL_OBJC_HEADER = NO;
+				SWIFT_VERSION = 4.2;
 				VALIDATE_PRODUCT = YES;
 				VALID_ARCHS = x86_64;
 				WRAPPER_EXTENSION = framework;
@@ -1777,6 +1801,7 @@
 				PRODUCT_BUNDLE_IDENTIFIER = "com.apple.dt.Xcode.PlaygroundSupportTests-OSX";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SDKROOT = macosx;
+				SWIFT_VERSION = 4.2;
 			};
 			name = Debug;
 		};
@@ -1815,6 +1840,7 @@
 				PRODUCT_BUNDLE_IDENTIFIER = "com.apple.dt.Xcode.PlaygroundSupportTests-OSX";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SDKROOT = macosx;
+				SWIFT_VERSION = 4.2;
 			};
 			name = Release;
 		};
@@ -1856,6 +1882,7 @@
 				PRODUCT_BUNDLE_IDENTIFIER = "com.apple.dt.Xcode.PlaygroundSupportTests-iOS";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SDKROOT = iphoneos;
+				SWIFT_VERSION = 4.2;
 			};
 			name = Debug;
 		};
@@ -1892,6 +1919,7 @@
 				PRODUCT_BUNDLE_IDENTIFIER = "com.apple.dt.Xcode.PlaygroundSupportTests-iOS";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SDKROOT = iphoneos;
+				SWIFT_VERSION = 4.2;
 				VALIDATE_PRODUCT = YES;
 			};
 			name = Release;
@@ -1933,6 +1961,7 @@
 				PRODUCT_BUNDLE_IDENTIFIER = "com.apple.dt.Xcode.PlaygroundSupportTests-tvOS";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SDKROOT = appletvos;
+				SWIFT_VERSION = 4.2;
 			};
 			name = Debug;
 		};
@@ -1968,6 +1997,7 @@
 				PRODUCT_BUNDLE_IDENTIFIER = "com.apple.dt.Xcode.PlaygroundSupportTests-tvOS";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SDKROOT = appletvos;
+				SWIFT_VERSION = 4.2;
 				VALIDATE_PRODUCT = YES;
 			};
 			name = Release;

PlaygroundSupport/PlaygroundSupportTests/LiveViewTests.swift

@@ -25,6 +25,9 @@ fileprivate typealias ViewType = UIView
 fileprivate typealias ViewControllerType = UIViewController
 #endif
 
+// This is intentionally redefined here in the tests, as this string cannot change as it has clients which refer to it by the string value rather than by symbol.
+fileprivate let playgroundPageLiveViewDidChangeNotification = Notification.Name(rawValue: "PlaygroundPageLiveViewDidChangeNotification")
+
 class LiveViewTests: XCTestCase {
 
     override func setUp() {
@@ -41,7 +44,7 @@ class LiveViewTests: XCTestCase {
         let view = ViewType()
 
         // Test setting to a view
-        expectation(forNotification: "PlaygroundPageLiveViewDidChangeNotification", object: PlaygroundPage.current) { (notification) in
+        expectation(forNotification: playgroundPageLiveViewDidChangeNotification, object: PlaygroundPage.current) { (notification) in
             guard let userInfoView = notification.userInfo?["PlaygroundPageLiveView"] as? ViewType else { return false }
             guard notification.userInfo?["PlaygroundPageLiveViewController"] == nil else { return false }
             XCTAssertEqual(userInfoView, view)
@@ -51,7 +54,7 @@ class LiveViewTests: XCTestCase {
         waitForExpectations(timeout: 0.1, handler: nil)
 
         // Test setting back to nil
-        expectation(forNotification: "PlaygroundPageLiveViewDidChangeNotification", object: PlaygroundPage.current) { (notification) in
+        expectation(forNotification: playgroundPageLiveViewDidChangeNotification, object: PlaygroundPage.current) { (notification) in
             guard notification.userInfo?["PlaygroundPageLiveView"] == nil else { return false }
             guard notification.userInfo?["PlaygroundPageLiveViewController"] == nil else { return false }
             return true
@@ -64,7 +67,7 @@ class LiveViewTests: XCTestCase {
         let viewController = ViewControllerType()
 
         // Test setting to a view controller
-        expectation(forNotification: "PlaygroundPageLiveViewDidChangeNotification", object: PlaygroundPage.current) { (notification) in
+        expectation(forNotification: playgroundPageLiveViewDidChangeNotification, object: PlaygroundPage.current) { (notification) in
             guard let userInfoViewController = notification.userInfo?["PlaygroundPageLiveViewController"] as? ViewControllerType else { return false }
             guard notification.userInfo?["PlaygroundPageLiveView"] == nil else { return false }
             XCTAssertEqual(userInfoViewController, viewController)
@@ -74,7 +77,7 @@ class LiveViewTests: XCTestCase {
         waitForExpectations(timeout: 0.1, handler: nil)
 
         // Test setting back to nil
-        expectation(forNotification: "PlaygroundPageLiveViewDidChangeNotification", object: PlaygroundPage.current) { (notification) in
+        expectation(forNotification: playgroundPageLiveViewDidChangeNotification, object: PlaygroundPage.current) { (notification) in
             guard notification.userInfo?["PlaygroundPageLiveView"] == nil else { return false }
             guard notification.userInfo?["PlaygroundPageLiveViewController"] == nil else { return false }
             return true