#74: Workaround for ScreenSaverDefaults not updated in Sonoma

ScreenSaverDefaults are not updated in macOS Sonoma when changed in System Preferences because an old instance of legacyScreenSaver with older values is still running in background and re-used when activating the screen saver again instead closing of legacyScreenSaver and starting an new instance with new values from ScreenSaverDefaults.
Adding a notification handler to com.apple.screensaver.willstop with exit(0) will now quit this old background instance when the screensaver is stoped used instead of keeping it running and reuing it later.

AnimatedGif.xcodeproj/project.pbxproj

@@ -3,7 +3,7 @@
 	archiveVersion = 1;
 	classes = {
 	};
-	objectVersion = 46;
+	objectVersion = 54;
 	objects = {
 
 /* Begin PBXBuildFile section */
@@ -139,12 +139,12 @@
 		CC24BA8C1BF124350045BDC7 /* Project object */ = {
 			isa = PBXProject;
 			attributes = {
-				LastUpgradeCheck = 1250;
+				BuildIndependentTargetsInParallel = YES;
+				LastUpgradeCheck = 1530;
 				ORGANIZATIONNAME = "Marco Köhler";
 				TargetAttributes = {
 					CC24BA941BF124350045BDC7 = {
 						CreatedOnToolsVersion = 6.2;
-						DevelopmentTeam = SQ837JJYGQ;
 					};
 				};
 			};
@@ -265,9 +265,11 @@
 				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
 				CODE_SIGN_IDENTITY = "Apple Development: [email protected] (RHZ2NT4CZR)";
 				COPY_PHASE_STRIP = NO;
+				DEAD_CODE_STRIPPING = YES;
 				ENABLE_HARDENED_RUNTIME = YES;
 				ENABLE_STRICT_OBJC_MSGSEND = YES;
 				ENABLE_TESTABILITY = YES;
+				ENABLE_USER_SCRIPT_SANDBOXING = YES;
 				GCC_C_LANGUAGE_STANDARD = gnu99;
 				GCC_DYNAMIC_NO_PIC = NO;
 				GCC_NO_COMMON_BLOCKS = YES;
@@ -321,10 +323,12 @@
 				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
 				CODE_SIGN_IDENTITY = "Apple Development: [email protected] (RHZ2NT4CZR)";
 				COPY_PHASE_STRIP = NO;
+				DEAD_CODE_STRIPPING = YES;
 				DEBUG_INFORMATION_FORMAT = "dwarf-with-dsym";
 				ENABLE_HARDENED_RUNTIME = YES;
 				ENABLE_NS_ASSERTIONS = NO;
 				ENABLE_STRICT_OBJC_MSGSEND = YES;
+				ENABLE_USER_SCRIPT_SANDBOXING = YES;
 				GCC_C_LANGUAGE_STANDARD = gnu99;
 				GCC_NO_COMMON_BLOCKS = YES;
 				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
@@ -342,9 +346,14 @@
 		CC24BAA11BF124350045BDC7 /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				"CODE_SIGN_IDENTITY[sdk=macosx*]" = "-";
 				COMBINE_HIDPI_IMAGES = YES;
+				DEAD_CODE_STRIPPING = YES;
+				"DEVELOPMENT_TEAM[sdk=macosx*]" = SQ837JJYGQ;
 				INFOPLIST_FILE = AnimatedGif/Info.plist;
 				INSTALL_PATH = "$(HOME)/Library/Screen Savers";
+				MACOSX_DEPLOYMENT_TARGET = 11.0;
+				MARKETING_VERSION = 1.5.5;
 				PRODUCT_BUNDLE_IDENTIFIER = "noname.$(PRODUCT_NAME:rfc1034identifier)";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SDKROOT = macosx;
@@ -355,9 +364,14 @@
 		CC24BAA21BF124350045BDC7 /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				"CODE_SIGN_IDENTITY[sdk=macosx*]" = "-";
 				COMBINE_HIDPI_IMAGES = YES;
+				DEAD_CODE_STRIPPING = YES;
+				"DEVELOPMENT_TEAM[sdk=macosx*]" = SQ837JJYGQ;
 				INFOPLIST_FILE = AnimatedGif/Info.plist;
 				INSTALL_PATH = "$(HOME)/Library/Screen Savers";
+				MACOSX_DEPLOYMENT_TARGET = 11.0;
+				MARKETING_VERSION = 1.5.5;
 				ONLY_ACTIVE_ARCH = NO;
 				PRODUCT_BUNDLE_IDENTIFIER = "noname.$(PRODUCT_NAME:rfc1034identifier)";
 				PRODUCT_NAME = "$(TARGET_NAME)";

AnimatedGif.xcodeproj/xcuserdata/koehmarc.xcuserdatad/xcschemes/AnimatedGif.xcscheme

@@ -1,10 +1,11 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "1250"
+   LastUpgradeVersion = "1530"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"
-      buildImplicitDependencies = "YES">
+      buildImplicitDependencies = "YES"
+      buildArchitectures = "All">
       <BuildActionEntries>
          <BuildActionEntry
             buildForTesting = "YES"

AnimatedGif/AnimatedGifView.m

@@ -22,6 +22,16 @@ - (instancetype)initWithFrame:(NSRect)frame isPreview:(BOOL)isPreview
     arrayLock = [[NSLock alloc] init];
     self = [super initWithFrame:frame isPreview:isPreview];
 
+    // workaround for Sonoma
+    if ([self isPreview] == FALSE)
+    {
+        [[NSDistributedNotificationCenter defaultCenter]
+           addObserver:self
+           selector:@selector(sonomaQuitWorkaround)
+           name:@"com.apple.screensaver.willstop"
+           object:nil];
+    }
+
     // initialize screensaver defaults with an default value
     ScreenSaverDefaults *defaults = [ScreenSaverDefaults defaultsForModuleWithName:[[NSBundle bundleForClass: [self class]] bundleIdentifier]];
     [defaults registerDefaults:[NSDictionary dictionaryWithObjectsAndKeys:
@@ -81,6 +91,14 @@ - (instancetype)initWithFrame:(NSRect)frame isPreview:(BOOL)isPreview
     return self;
 }
 
+- (void) sonomaQuitWorkaround
+{
+    // workaround for Sonoma:
+    // quit legacyScreenSaver when screensaver is stoped instead of keeping instance running in background as it is the case in Sonoma
+    // problem with this running background legacyScreenSaver is that it keeps using old vales of ScreenSaverDefaults and ignores new options the user has done in the meantime.
+    exit(0);
+}
+
 - (NSOpenGLView *)createViewGL
 {
     NSOpenGLPixelFormatAttribute attribs[] = {

AnimatedGif/Info.plist

@@ -15,7 +15,7 @@
 	<key>CFBundlePackageType</key>
 	<string>BNDL</string>
 	<key>CFBundleShortVersionString</key>
-	<string>1.5.4</string>
+	<string>$(MARKETING_VERSION)</string>
 	<key>CFBundleSignature</key>
 	<string>com.waitsnake.animatedgif</string>
 	<key>CFBundleVersion</key>