fixed custom top bar alignment

ios/RCCCustomTitleView.m

@@ -29,9 +29,10 @@
         
         if ([alignment isEqualToString:@"fill"]) {
             self.frame = frame;
-            self.subView.frame = self.frame;
+            subView.sizeFlexibility = RCTRootViewSizeFlexibilityNone;
         } else {
             self.subView.delegate = self;
+            subView.sizeFlexibility = RCTRootViewSizeFlexibilityWidthAndHeight;
         }
         
         [self addSubview:subView];
@@ -40,6 +41,17 @@
     return self;
 }
 
+- (void)layoutSubviews {
+    [super layoutSubviews];
+    if ([self.alignment isEqualToString:@"fill"]) {
+        [self.subView setFrame:self.bounds];
+    }
+}
+
+- (NSString *)alignment {
+    return _alignment ? _alignment : @"center";
+}
+
 - (void)rootViewDidChangeIntrinsicSize:(RCTRootView *)rootView {
     if ([self.alignment isEqualToString:@"center"]) {
         [self setFrame:CGRectMake(0, 0, rootView.intrinsicContentSize.width, rootView.intrinsicContentSize.height)];

ios/RCCViewController.m

@@ -642,12 +642,11 @@ const NSInteger TRANSPARENT_NAVBAR_TAG = 78264803;
       
       NSDictionary *initialProps = self.navigatorStyle[@"navBarCustomViewInitialProps"];
       RCTRootView *reactView = [[RCTRootView alloc] initWithBridge:bridge moduleName:navBarCustomView initialProperties:initialProps];
-      reactView.sizeFlexibility = RCTRootViewSizeFlexibilityWidthAndHeight;
-        
+
       RCCCustomTitleView *titleView = [[RCCCustomTitleView alloc] initWithFrame:self.navigationController.navigationBar.bounds
                                                                         subView:reactView
                                                                       alignment:self.navigatorStyle[@"navBarComponentAlignment"]];
-      
+
       self.navigationItem.titleView = titleView;
       self.navigationItem.titleView.backgroundColor = [UIColor clearColor];
       self.navigationItem.titleView.clipsToBounds = YES;