Fix sizing of root node in ASViewController for modal presentation and root view controller

AsyncDisplayKit/ASViewController.mm

@@ -88,19 +88,7 @@
   [super viewWillLayoutSubviews];
   [_node measureWithSizeRange:[self nodeConstrainedSize]];
   
-  if (!AS_AT_LEAST_IOS9) {
-    [self _legacyHandleViewDidLayoutSubviews];
-  }
-}
-
-- (void)_legacyHandleViewDidLayoutSubviews
-{
-  // In modal presentation the view does not automatic resize in iOS7 and iOS8. As workaround we adjust the frame of the
-  // view manually
-  if (self.presentingViewController != nil) {
-    CGSize maxConstrainedSize = [self nodeConstrainedSize].max;
-    _node.frame = (CGRect){.origin = CGPointZero, .size = maxConstrainedSize};
-  }
+  [self _legacyHandleViewDidLayoutSubviewsIfNecessary];
 }
 
 - (void)viewDidLayoutSubviews
@@ -197,13 +185,27 @@ ASVisibilityDepthImplementation;
   }
 }
 
+- (ASInterfaceState)interfaceState
+{
+  return _node.interfaceState;
+}
+
+#pragma mark - Legacy Layout Handling
+
+- (BOOL)_shouldLayoutTheLegacyWay
+{
+  BOOL isModal = (self.presentingViewController != nil && self.presentedViewController == nil);
+  BOOL isRootViewController = self.view.window.rootViewController == self;
+  return isModal || isRootViewController;
+}
+
 - (ASSizeRange)_legacyConstrainedSize
 {
   // In modal presentation the view does not have the right bounds in iOS7 and iOS8. As workaround using the superviews
   // view bounds
   UIView *view = self.view;
   CGSize viewSize = view.bounds.size;
-  if (self.presentingViewController != nil) {
+  if ([self _shouldLayoutTheLegacyWay]) {
     UIView *superview = view.superview;
     if (superview != nil) {
       viewSize = superview.bounds.size;
@@ -212,9 +214,18 @@ ASVisibilityDepthImplementation;
   return ASSizeRangeMake(viewSize, viewSize);
 }
 
-- (ASInterfaceState)interfaceState
+- (void)_legacyHandleViewDidLayoutSubviewsIfNecessary
 {
-  return _node.interfaceState;
+  if (AS_AT_LEAST_IOS9) {
+    return;
+  }
+  
+  // In modal presentation or as root viw controller the view does not automatic resize in iOS7 and iOS8.
+  // As workaround we adjust the frame of the view manually
+  if ([self _shouldLayoutTheLegacyWay]) {
+    CGSize maxConstrainedSize = [self nodeConstrainedSize].max;
+    _node.frame = (CGRect){.origin = CGPointZero, .size = maxConstrainedSize};
+  }
 }
 
 #pragma mark - ASEnvironmentTraitCollection