diff --git a/Sources/OpenSwiftUI/Integration/Render/UIKit/UIViewPlatformViewDefinition.swift b/Sources/OpenSwiftUI/Integration/Render/UIKit/UIViewPlatformViewDefinition.swift
index ed994d3e..4dd84a15 100644
--- a/Sources/OpenSwiftUI/Integration/Render/UIKit/UIViewPlatformViewDefinition.swift
+++ b/Sources/OpenSwiftUI/Integration/Render/UIKit/UIViewPlatformViewDefinition.swift
@@ -52,17 +52,18 @@ final class UIViewPlatformViewDefinition: PlatformViewDefinition, @unchecked Sen
         if kind != .platformView && kind != .platformGroup {
             view.autoresizesSubviews = false
             if !kind.isContainer {
-                // view._setFocusInteractionEnabled = false
+                view._setFocusInteractionEnabled(false)
             }
         }
         view.layer.anchorPoint = .zero
         switch kind {
         case .color, .image, .shape:
-                // view.layer.setAllowsEdgeAntialiasing = true
+            view.layer.setAllowsEdgeAntialiasing(true)
             break
         case .geometry, .projection, .affine3D, .mask, .platformEffect:
-            // view.layer.setAllowsGroupOpacity = false
-            // view.layer.setAllowsGroupBlending = false
+            let layer = view.layer
+            layer.setAllowsGroupOpacity(false)
+            layer.setAllowsGroupBlending(false)
             break
         default:
             break
diff --git a/Sources/OpenSwiftUI_SPI/Shims/AppKit/AppKit_Private.h b/Sources/OpenSwiftUI_SPI/Shims/AppKit/AppKit_Private.h
index f43f279a..5e83db1f 100644
--- a/Sources/OpenSwiftUI_SPI/Shims/AppKit/AppKit_Private.h
+++ b/Sources/OpenSwiftUI_SPI/Shims/AppKit/AppKit_Private.h
@@ -16,9 +16,9 @@
 OPENSWIFTUI_ASSUME_NONNULL_BEGIN
 
 @interface NSApplication (OpenSwiftUI_SPI)
-- (void)startedTest:(nullable NSString *)name;
-- (void)finishedTest:(nullable NSString *)name;
-- (void)failedTest:(nullable NSString *)name withFailure:(nullable NSError*)failure;
+- (void)startedTest_openswiftui_safe_wrapper:(nullable NSString *)name OPENSWIFTUI_SWIFT_NAME(startedTest(_:));
+- (void)finishedTest_openswiftui_safe_wrapper:(nullable NSString *)name OPENSWIFTUI_SWIFT_NAME(finishedTest(_:));
+- (void)failedTest_openswiftui_safe_wrapper:(nullable NSString *)name withFailure:(nullable NSError*)failure OPENSWIFTUI_SWIFT_NAME(failedTest(_:withFailure:));
 @end
 
 OPENSWIFTUI_ASSUME_NONNULL_END
diff --git a/Sources/OpenSwiftUI_SPI/Shims/AppKit/AppKit_Private.m b/Sources/OpenSwiftUI_SPI/Shims/AppKit/AppKit_Private.m
index 84e89901..df9ed293 100644
--- a/Sources/OpenSwiftUI_SPI/Shims/AppKit/AppKit_Private.m
+++ b/Sources/OpenSwiftUI_SPI/Shims/AppKit/AppKit_Private.m
@@ -5,4 +5,28 @@
 //  Status: WIP
 
 #import "AppKit_Private.h"
+#import "../OpenSwiftUIShims.h"
+
+#if __has_include(<AppKit/AppKit.h>)
+
+#import <objc/runtime.h>
+
+@implementation NSApplication (OpenSwiftUI_SPI)
+- (void)startedTest_openswiftui_safe_wrapper:(NSString *)name {
+    OPENSWIFTUI_SAFE_WRAPPER_IMP(void, @"startedTest:", , NSString *);
+    func(self, selector, name);
+}
+
+- (void)finishedTest_openswiftui_safe_wrapper:(NSString *)name {
+    OPENSWIFTUI_SAFE_WRAPPER_IMP(void, @"finishedTest:", , NSString *);
+    func(self, selector, name);
+}
+
+- (void)failedTest_openswiftui_safe_wrapper:(NSString *)name withFailure:(NSError *)failure {
+    OPENSWIFTUI_SAFE_WRAPPER_IMP(void, @"failedTest:withFailure:", , NSString *, NSError *);
+    func(self, selector, name, failure);
+}
+@end
+
+#endif /* AppKit.h */
 
diff --git a/Sources/OpenSwiftUI_SPI/Shims/CoreAnimation/CoreAnimation_Private.h b/Sources/OpenSwiftUI_SPI/Shims/CoreAnimation/CoreAnimation_Private.h
index d8bc54fc..1b7c7027 100644
--- a/Sources/OpenSwiftUI_SPI/Shims/CoreAnimation/CoreAnimation_Private.h
+++ b/Sources/OpenSwiftUI_SPI/Shims/CoreAnimation/CoreAnimation_Private.h
@@ -14,7 +14,11 @@
 OPENSWIFTUI_ASSUME_NONNULL_BEGIN
 
 @interface CALayer (OpenSwiftUI_SPI)
-@property (nonatomic, assign, readonly) BOOL openSwiftUI_hasBeenCommitted OPENSWIFTUI_SWIFT_NAME(hasBeenCommitted);
+@property (nonatomic, assign, readonly) BOOL hasBeenCommitted_openswiftui_safe_wrapper OPENSWIFTUI_SWIFT_NAME(hasBeenCommitted);
+- (void)setAllowsEdgeAntialiasing_openswiftui_safe_wrapper:(BOOL)allows OPENSWIFTUI_SWIFT_NAME(setAllowsEdgeAntialiasing(_:));
+- (void)setAllowsGroupOpacity_openswiftui_safe_wrapper:(BOOL)allows OPENSWIFTUI_SWIFT_NAME(setAllowsGroupOpacity(_:));
+- (void)setAllowsGroupBlending_openswiftui_safe_wrapper:(BOOL)allows OPENSWIFTUI_SWIFT_NAME(setAllowsGroupBlending(_:));
+
 @property (nonatomic, assign) uint64_t openSwiftUI_viewTestProperties;
 @end
 
diff --git a/Sources/OpenSwiftUI_SPI/Shims/CoreAnimation/CoreAnimation_Private.m b/Sources/OpenSwiftUI_SPI/Shims/CoreAnimation/CoreAnimation_Private.m
index d3ca1284..c81a74fa 100644
--- a/Sources/OpenSwiftUI_SPI/Shims/CoreAnimation/CoreAnimation_Private.m
+++ b/Sources/OpenSwiftUI_SPI/Shims/CoreAnimation/CoreAnimation_Private.m
@@ -6,52 +6,39 @@
 
 #if __has_include(<QuartzCore/CoreAnimation.h>)
 
+#import "../OpenSwiftUIShims.h"
 #import <objc/runtime.h>
 
 @implementation CALayer (OpenSwiftUI_SPI)
 
-- (BOOL)openSwiftUI_hasBeenCommitted {
-    typedef BOOL (*Func)(CALayer *, SEL);
-    SEL selector = NSSelectorFromString(@"hasBeenCommitted");
-    Func func = nil;
-    if ([self respondsToSelector:selector]) {
-        IMP impl = class_getMethodImplementation([self class], selector);
-        func = (Func)impl;
-    }
-    if (func == nil) {
-        return NO;
-    }
+- (BOOL)hasBeenCommitted_openswiftui_safe_wrapper {
+    OPENSWIFTUI_SAFE_WRAPPER_IMP(BOOL, @"hasBeenCommitted", NO);
     return func(self, selector);
 }
 
-- (uint64_t)openSwiftUI_viewTestProperties {
-    typedef uint64_t (*Func)(CALayer *, SEL);
-    SEL selector = NSSelectorFromString(@"swiftUI_viewTestProperties");
-    Func func = nil;
-    if ([self respondsToSelector:selector]) {
-        IMP impl = class_getMethodImplementation([self class], selector);
-        func = (Func)impl;
-    }
-    if (func == nil) {
-        return 0;
-    }
-    return func(self, selector);
+- (void)setAllowsEdgeAntialiasing_openswiftui_safe_wrapper:(BOOL)allows {
+    OPENSWIFTUI_SAFE_WRAPPER_IMP(void, @"setAllowsEdgeAntialiasing:", , BOOL);
+    func(self, selector, allows);
+}
+
+- (void)setAllowsGroupOpacity_openswiftui_safe_wrapper:(BOOL)allows {
+    OPENSWIFTUI_SAFE_WRAPPER_IMP(void, @"setAllowsGroupOpacity:", , BOOL);
+    func(self, selector, allows);
 }
 
-- (void)setOpenSwiftUI_viewTestProperties:(uint64_t)viewTestProperties {
-    typedef void (*Func)(CALayer *, SEL, uint64_t);
-    SEL selector = NSSelectorFromString(@"setSwiftUI_viewTestProperties:");
-    Func func = nil;
-    if ([self respondsToSelector:selector]) {
-        IMP impl = class_getMethodImplementation([self class], selector);
-        func = (Func)impl;
-    }
-    if (func == nil) {
-        return;
-    }
-    return func(self, selector, viewTestProperties);
+- (void)setAllowsGroupBlending_openswiftui_safe_wrapper:(BOOL)allows {
+    OPENSWIFTUI_SAFE_WRAPPER_IMP(void, @"setAllowsGroupBlending:", , BOOL);
+    func(self, selector, allows);
 }
 
+- (uint64_t)openSwiftUI_viewTestProperties {
+    NSNumber *properties = [self valueForKey:@"_viewTestProperties"];
+    return properties.integerValue;
+}
+
+- (void)setOpenSwiftUI_viewTestProperties:(uint64_t)properties {
+    [self setValue:[NSNumber numberWithUnsignedLongLong:properties] forKey:@"_viewTestProperties"];
+}
 @end
 
 #endif /* CoreAnimation.h */
diff --git a/Sources/OpenSwiftUI_SPI/Shims/OpenSwiftUIShims.h b/Sources/OpenSwiftUI_SPI/Shims/OpenSwiftUIShims.h
new file mode 100644
index 00000000..f587ccb4
--- /dev/null
+++ b/Sources/OpenSwiftUI_SPI/Shims/OpenSwiftUIShims.h
@@ -0,0 +1,42 @@
+//
+//  OpenSwiftUIShims.h
+//  OpenSwiftUI_SPI
+//
+
+#ifndef OpenSwiftUIShims_h
+#define OpenSwiftUIShims_h
+
+#include "OpenSwiftUIBase.h"
+
+#if OPENSWIFTUI_TARGET_OS_DARWIN
+
+#include <os/log.h>
+
+OPENSWIFTUI_ASSUME_NONNULL_BEGIN
+
+OPENSWIFTUI_EXPORT
+os_log_t openSwiftUIShimsLog(void);
+
+#define OPENSWIFTUI_SHIMS_LOG_ERROR(fmt, ...) os_log_error(openSwiftUIShimsLog(), fmt, ##__VA_ARGS__)
+
+#define OPENSWIFTUI_SAFE_WRAPPER_IMP(ReturnType, SelectorName, DefaultReturnValue, ...) \
+    typedef ReturnType (*Func)(id, SEL, ##__VA_ARGS__); \
+    SEL selector = NSSelectorFromString(SelectorName); \
+    Func func = nil; \
+    if ([self respondsToSelector:selector]) { \
+        IMP impl = class_getMethodImplementation([self class], selector); \
+        func = (Func)impl; \
+    } else { \
+        OPENSWIFTUI_SHIMS_LOG_ERROR("%@ can't respond to selector %@", NSStringFromClass([self class]), NSStringFromSelector(selector)); \
+    } \
+    if (func == nil) { \
+        OPENSWIFTUI_SHIMS_LOG_ERROR("%@ can't get method implementation for selector %@", NSStringFromClass([self class]), NSStringFromSelector(selector)); \
+        return DefaultReturnValue; \
+    }
+
+
+OPENSWIFTUI_ASSUME_NONNULL_END
+
+#endif /* OPENSWIFTUI_TARGET_OS_DARWIN */
+
+#endif /* OpenSwiftUIShims_h */
diff --git a/Sources/OpenSwiftUI_SPI/Shims/OpenSwiftUIShims.m b/Sources/OpenSwiftUI_SPI/Shims/OpenSwiftUIShims.m
new file mode 100644
index 00000000..ff5a8958
--- /dev/null
+++ b/Sources/OpenSwiftUI_SPI/Shims/OpenSwiftUIShims.m
@@ -0,0 +1,19 @@
+//
+//  OpenSwiftUIShims.m
+//  OpenSwiftUI_SPI
+//
+
+#import "OpenSwiftUIShims.h"
+
+#if OPENSWIFTUI_TARGET_OS_DARWIN
+
+os_log_t openSwiftUIShimsLog(void) {
+    static dispatch_once_t onceToken;
+    static os_log_t log = NULL;
+    dispatch_once(&onceToken, ^{
+        log = os_log_create("org.OpenSwiftUIProject.OpenSwiftUI", "Shims");
+    });
+    return log;
+}
+
+#endif /* OPENSWIFTUI_TARGET_OS_DARWIN */
diff --git a/Sources/OpenSwiftUI_SPI/Shims/UIKit/UIKit_Private.h b/Sources/OpenSwiftUI_SPI/Shims/UIKit/UIKit_Private.h
index 9bac465e..c2794e7d 100644
--- a/Sources/OpenSwiftUI_SPI/Shims/UIKit/UIKit_Private.h
+++ b/Sources/OpenSwiftUI_SPI/Shims/UIKit/UIKit_Private.h
@@ -17,20 +17,21 @@ OPENSWIFTUI_ASSUME_NONNULL_BEGIN
 
 @interface UIApplication (OpenSwiftUI_SPI)
 // Test API
-- (void)startedTest:(nullable NSString *)name;
-- (void)finishedTest:(nullable NSString *)name;
-- (void)failedTest:(nullable NSString *)name withFailure:(nullable NSError*)failure;
-- (nullable NSString *)_launchTestName;
+- (void)startedTest_openswiftui_safe_wrapper:(nullable NSString *)name OPENSWIFTUI_SWIFT_NAME(startedTest(_:));
+- (void)finishedTest_openswiftui_safe_wrapper:(nullable NSString *)name OPENSWIFTUI_SWIFT_NAME(finishedTest(_:));
+- (void)failedTest_openswiftui_safe_wrapper:(nullable NSString *)name withFailure:(nullable NSError*)failure OPENSWIFTUI_SWIFT_NAME(failedTest(_:withFailure:));
+- (nullable NSString *)_launchTestName_openswiftui_safe_wrapper OPENSWIFTUI_SWIFT_NAME(_launchTestName());
 
 - (void)_performBlockAfterCATransactionCommits_openswiftui_safe_wrapper:(void (^)(void))block OPENSWIFTUI_SWIFT_NAME(_performBlockAfterCATransactionCommits(_:));
 @end
 
 @interface UIView (OpenSwiftUI_SPI)
-- (BOOL)_shouldAnimatePropertyWithKey:(NSString *)key;
+- (BOOL)_shouldAnimatePropertyWithKey_openswiftui_safe_wrapper:(NSString *)key OPENSWIFTUI_SWIFT_NAME(_shouldAnimateProperty(withKey:));
+- (void)_setFocusInteractionEnabled_openswiftui_safe_wrapper:(BOOL)enabled OPENSWIFTUI_SWIFT_NAME(_setFocusInteractionEnabled(_:));
 @end
 
 @interface UIViewController (OpenSwiftUI_SPI)
-@property (nonatomic, readonly) BOOL _canShowWhileLocked;
+@property (nonatomic, readonly) BOOL _canShowWhileLocked_openswiftui_safe_wrapper OPENSWIFTUI_SWIFT_NAME(_canShowWhileLocked);
 @end
 
 OPENSWIFTUI_EXPORT
diff --git a/Sources/OpenSwiftUI_SPI/Shims/UIKit/UIKit_Private.m b/Sources/OpenSwiftUI_SPI/Shims/UIKit/UIKit_Private.m
index 08a8869c..0624d3b1 100644
--- a/Sources/OpenSwiftUI_SPI/Shims/UIKit/UIKit_Private.m
+++ b/Sources/OpenSwiftUI_SPI/Shims/UIKit/UIKit_Private.m
@@ -5,6 +5,7 @@
 //  Status: WIP
 
 #import "UIKit_Private.h"
+#import "../OpenSwiftUIShims.h"
 
 #if __has_include(<UIKit/UIKit.h>)
 
@@ -12,16 +13,47 @@
 
 @implementation UIApplication (OpenSwiftUI_SPI)
 - (void)_performBlockAfterCATransactionCommits_openswiftui_safe_wrapper:(void (^)(void))block {
-    typedef void (*Func)(UIApplication *, SEL, void (^)(void));
-    SEL selector = NSSelectorFromString(@"_performBlockAfterCATransactionCommits:");
-    Func func = nil;
-    if ([self respondsToSelector:selector]) {
-        IMP impl = class_getMethodImplementation([self class], selector);
-        func = (Func)impl;
-    }
-    if (func != nil) {
-        func(self, selector, block);
-    }
+    OPENSWIFTUI_SAFE_WRAPPER_IMP(void, @"_performBlockAfterCATransactionCommits:", block(),void (^)(void));
+    func(self, selector, block);
+}
+
+- (void)startedTest_openswiftui_safe_wrapper:(NSString *)name {
+    OPENSWIFTUI_SAFE_WRAPPER_IMP(void, @"startedTest:", , NSString *);
+    func(self, selector, name);
+}
+
+- (void)finishedTest_openswiftui_safe_wrapper:(NSString *)name {
+    OPENSWIFTUI_SAFE_WRAPPER_IMP(void, @"finishedTest:", , NSString *);
+    func(self, selector, name);
+}
+
+- (void)failedTest_openswiftui_safe_wrapper:(NSString *)name withFailure:(NSError *)failure {
+    OPENSWIFTUI_SAFE_WRAPPER_IMP(void, @"failedTest:withFailure:", , NSString *, NSError *);
+    func(self, selector, name, failure);
+}
+
+- (NSString *)_launchTestName_openswiftui_safe_wrapper {
+    OPENSWIFTUI_SAFE_WRAPPER_IMP(NSString *, @"_launchTestName", nil);
+    return func(self, selector);
+}
+@end
+
+@implementation UIView (OpenSwiftUI_SPI)
+- (BOOL)_shouldAnimatePropertyWithKey_openswiftui_safe_wrapper:(NSString *)key {
+    OPENSWIFTUI_SAFE_WRAPPER_IMP(BOOL, @"_shouldAnimatePropertyWithKey:", NO, NSString *);
+    return func(self, selector, key);
+}
+
+- (void)_setFocusInteractionEnabled_openswiftui_safe_wrapper:(BOOL)enabled {
+    OPENSWIFTUI_SAFE_WRAPPER_IMP(void, @"_setFocusInteractionEnabled:", , BOOL);
+    func(self, selector, enabled);
+}
+@end
+
+@implementation UIViewController (OpenSwiftUI_SPI)
+- (BOOL)_canShowWhileLocked_openswiftui_safe_wrapper {
+    OPENSWIFTUI_SAFE_WRAPPER_IMP(BOOL, @"_canShowWhileLocked", NO);
+    return func(self, selector);
 }
 @end
 
diff --git a/Tests/OpenSwiftUI_SPITests/Shims/AppKitPrivateTests.swift b/Tests/OpenSwiftUI_SPITests/Shims/AppKitPrivateTests.swift
new file mode 100644
index 00000000..c6bfdc58
--- /dev/null
+++ b/Tests/OpenSwiftUI_SPITests/Shims/AppKitPrivateTests.swift
@@ -0,0 +1,20 @@
+//
+//  AppKitPrivateTests.swift
+//  OpenSwiftUI_SPITests
+
+import OpenSwiftUI_SPI
+import Testing
+
+#if canImport(AppKit)
+@MainActor
+struct AppKitPrivateTests {
+    @Test
+    func application() {
+        let app = NSApplication.shared
+        let name = "ATest"
+        app.startedTest(name)
+        app.finishedTest(name)
+        app.failedTest(name, withFailure: nil)
+    }
+}
+#endif
diff --git a/Tests/OpenSwiftUI_SPITests/Shims/CoreAnimationPrivateTests.swift b/Tests/OpenSwiftUI_SPITests/Shims/CoreAnimationPrivateTests.swift
new file mode 100644
index 00000000..beda59a1
--- /dev/null
+++ b/Tests/OpenSwiftUI_SPITests/Shims/CoreAnimationPrivateTests.swift
@@ -0,0 +1,23 @@
+//
+//  CoreAnimationPrivateTests.swift
+//  OpenSwiftUI_SPITests
+
+import OpenSwiftUI_SPI
+import Testing
+
+#if canImport(QuartzCore)
+@MainActor
+struct CoreAnimationPrivateTests {
+    @Test
+    func layer() {
+        let layer = CALayer()
+        #expect(layer.hasBeenCommitted == false)
+        layer.setAllowsEdgeAntialiasing(true)
+        layer.setAllowsGroupOpacity(true)
+        layer.setAllowsGroupBlending(true)
+        
+        layer.openSwiftUI_viewTestProperties = 42
+        #expect(layer.openSwiftUI_viewTestProperties == 42)
+    }
+}
+#endif
diff --git a/Tests/OpenSwiftUI_SPITests/Shims/UIKitPrivateTests.swift b/Tests/OpenSwiftUI_SPITests/Shims/UIKitPrivateTests.swift
new file mode 100644
index 00000000..a33a123a
--- /dev/null
+++ b/Tests/OpenSwiftUI_SPITests/Shims/UIKitPrivateTests.swift
@@ -0,0 +1,36 @@
+//
+//  UIKitPrivateTests.swift
+//  OpenSwiftUI_SPITests
+
+import OpenSwiftUI_SPI
+import Testing
+
+#if canImport(UIKit)
+@MainActor
+struct UIKitPrivateTests {
+    @Test
+    func application() {
+        let app = UIApplication.shared
+        let name = "ATest"
+        app.startedTest(name)
+        app.finishedTest(name)
+        app.failedTest(name, withFailure: nil)
+        #expect(app._launchTestName() == nil)
+    }
+
+    @Test
+    func view() {
+        let view = UIView()
+        #expect(view._shouldAnimateProperty(withKey: "frame") == false)
+        #expect(view._shouldAnimateProperty(withKey: "alpha") == false)
+
+        view._setFocusInteractionEnabled(true)
+    }
+
+    @Test
+    func viewController() {
+        let controller = UIViewController()
+        #expect(controller._canShowWhileLocked == true)
+    }
+}
+#endif