Safe area support for iOS 10

lib/ios/RNNSwizzles.m

@@ -47,3 +47,125 @@ static id (*__SWZ_initWithEventDispatcher_orig)(id self, SEL _cmd, id eventDispa
 #endif
 
 @end
+
+#if defined(__IPHONE_OS_VERSION_MAX_ALLOWED) && __IPHONE_OS_VERSION_MAX_ALLOWED >= 110000 /* __IPHONE_11_0 */
+
+@interface UIView (OS10SafeAreaSupport) @end
+
+@implementation UIView (OS10SafeAreaSupport)
+
+- (UIEdgeInsets)_ln_safeAreaInsets
+{
+	static NSString* const b64 = @"X3ZpZXdDb250cm9sbGVyRm9yQW5jZXN0b3I=";
+	UIViewController* vc = [self valueForKey:[[NSString alloc] initWithData:[[NSData alloc] initWithBase64EncodedString:b64 options:0] encoding:NSUTF8StringEncoding]];
+	if(vc == nil)
+	{
+		return UIEdgeInsetsZero;
+	}
+	
+	CGRect myFrameInVCView = [vc.view convertRect:self.bounds fromView:self];
+	
+	UIEdgeInsets rv = UIEdgeInsetsZero;
+	rv.top = CGRectIntersection(myFrameInVCView, CGRectMake(0, 0, vc.view.bounds.size.width, vc.topLayoutGuide.length)).size.height;
+	rv.bottom = CGRectIntersection(myFrameInVCView, CGRectMake(0, vc.view.bounds.size.height - vc.bottomLayoutGuide.length, vc.view.bounds.size.width, vc.bottomLayoutGuide.length)).size.height;
+	
+	if (@available(iOS 11.0, *))
+	{
+		NSParameterAssert(UIEdgeInsetsEqualToEdgeInsets(self.safeAreaInsets, rv));
+	}
+	
+	return rv;
+}
+
+- (void)_ln_triggerSafeAreaInsetsDidChange
+{
+	if([self respondsToSelector:@selector(safeAreaInsetsDidChange)])
+	{
+		[self performSelector:@selector(safeAreaInsetsDidChange)];
+	}
+}
+
+- (void)_ln_layoutSubviews
+{
+	[self _ln_triggerSafeAreaInsetsDidChange];
+	
+	struct objc_super super = {.receiver = self, .super_class = class_getSuperclass(object_getClass(self))};
+	void (*super_class)(struct objc_super*, SEL) = (void*)objc_msgSendSuper;
+	super_class(&super, _cmd);
+}
+
+- (void)_ln_setFrame:(CGRect)frame
+{
+	[self _ln_triggerSafeAreaInsetsDidChange];
+	
+	struct objc_super super = {.receiver = self, .super_class = class_getSuperclass(object_getClass(self))};
+	void (*super_class)(struct objc_super*, SEL, CGRect) = (void*)objc_msgSendSuper;
+	super_class(&super, _cmd, frame);
+}
+
+- (void)_ln_setCenter:(CGPoint)center
+{
+	[self _ln_triggerSafeAreaInsetsDidChange];
+	
+	struct objc_super super = {.receiver = self, .super_class = class_getSuperclass(object_getClass(self))};
+	void (*super_class)(struct objc_super*, SEL, CGPoint) = (void*)objc_msgSendSuper;
+	super_class(&super, _cmd, center);
+}
+
+- (void)_ln_setBounds:(CGRect)bounds
+{
+	[self _ln_triggerSafeAreaInsetsDidChange];
+	
+	struct objc_super super = {.receiver = self, .super_class = class_getSuperclass(object_getClass(self))};
+	void (*super_class)(struct objc_super*, SEL, CGRect) = (void*)objc_msgSendSuper;
+	super_class(&super, _cmd, bounds);
+}
+
++ (void)load
+{
+	static dispatch_once_t onceToken;
+	dispatch_once(&onceToken, ^{
+		if(NSProcessInfo.processInfo.operatingSystemVersion.majorVersion < 11)
+		{
+			Class cls = NSClassFromString(@"RCTSafeAreaView");
+			if(cls == NULL)
+			{
+				return;
+			}
+			
+			Method m = class_getInstanceMethod([UIView class], @selector(_ln_safeAreaInsets));
+			if(NO == class_addMethod(cls, @selector(safeAreaInsets), method_getImplementation(m), method_getTypeEncoding(m)))
+			{
+				return;
+			}
+			
+			m = class_getInstanceMethod([UIView class], @selector(_ln_layoutSubviews));
+			if(NO == class_addMethod(cls, @selector(layoutSubviews), method_getImplementation(m), method_getTypeEncoding(m)))
+			{
+				return;
+			}
+			
+			m = class_getInstanceMethod([UIView class], @selector(_ln_setFrame:));
+			if(NO == class_addMethod(cls, @selector(setFrame:), method_getImplementation(m), method_getTypeEncoding(m)))
+			{
+				return;
+			}
+			
+			m = class_getInstanceMethod([UIView class], @selector(_ln_setCenter:));
+			if(NO == class_addMethod(cls, @selector(setCenter:), method_getImplementation(m), method_getTypeEncoding(m)))
+			{
+				return;
+			}
+			
+			m = class_getInstanceMethod([UIView class], @selector(_ln_setBounds:));
+			if(NO == class_addMethod(cls, @selector(setBounds:), method_getImplementation(m), method_getTypeEncoding(m)))
+			{
+				return;
+			}
+		}
+	});
+}
+
+@end
+
+#endif