Set subtitle fontSize and fontFamily

lib/android/app/src/main/java/com/reactnativenavigation/presentation/OptionsPresenter.java

         if (options.title.component.hasValue()) topBar.setTitleComponent(options.title.component.get(), options.title.alignment);
         if (options.title.color.hasValue()) topBar.setTitleTextColor(options.title.color.get());
         if (options.title.fontSize.hasValue()) topBar.setTitleFontSize(options.title.fontSize.get());
+        topBar.setTitleTypeface(options.title.fontFamily);
 
         if (options.subtitle.text.hasValue()) topBar.setSubtitle(options.subtitle.text.get());
         if (options.subtitle.color.hasValue()) topBar.setSubtitleColor(options.subtitle.color.get());
-        if (options.subtitle.fontFamily != null) topBar.setSubtitleFontFamily(options.subtitle.fontFamily);
-        if (options.subtitle.fontSize.hasValue()) topBar.setTitleFontSize(options.subtitle.fontSize.get());
+        if (options.subtitle.fontSize.hasValue()) topBar.setSubtitleFontSize(options.subtitle.fontSize.get());
+        topBar.setSubtitleFontFamily(options.subtitle.fontFamily);
 
         topBar.setBackgroundColor(options.background.color);
         topBar.setBackgroundComponent(options.background.component);
         if (options.testId.hasValue()) topBar.setTestId(options.testId.get());
 
-        topBar.setTitleTypeface(options.title.fontFamily);
         if (options.visible.isFalse()) {
             if (options.animate.isTrueOrUndefined()) {
                 topBar.hideAnimate(animationOptions.pop.topBar);

lib/android/app/src/main/java/com/reactnativenavigation/utils/ViewUtils.java

     }
 
     public static <T> List<T> findChildrenByClass(ViewGroup root, Class clazz) {
+        return findChildrenByClass(root, clazz, child -> true);
+    }
+
+    public static <T> List<T> findChildrenByClass(ViewGroup root, Class clazz, Matcher<T> matcher) {
         List<T> ret = new ArrayList<>();
         for (int i = 0; i < root.getChildCount(); i++) {
-            View view = root.getChildAt(i);
-            if (clazz.isAssignableFrom(view.getClass())) {
-                ret.add((T) view);
+            View child = root.getChildAt(i);
+            if (clazz.isAssignableFrom(child.getClass()) && matcher.match((T) child)) {
+                ret.add((T) child);
             }
         }
         return ret;
     }
+
+    public interface Matcher<T> {
+        boolean match(T child);
+    }
 }

lib/android/app/src/main/java/com/reactnativenavigation/views/titlebar/TitleBar.java

         if (titleTextView != null) titleTextView.setTypeface(typeface);
     }
 
+    public void setSubtitleTypeface(Typeface typeface) {
+        TextView subtitleTextView = findSubtitleTextView();
+        if (subtitleTextView != null) subtitleTextView.setTypeface(typeface);
+    }
+
+    public void setSubtitleFontSize(float size) {
+        TextView subtitleTextView = findSubtitleTextView();
+        if (subtitleTextView != null) subtitleTextView.setTextSize(size);
+    }
+
     @Nullable
     public TextView findTitleTextView() {
-        List<TextView> children = ViewUtils.findChildrenByClass(this, TextView.class);
+        List<TextView> children = ViewUtils.findChildrenByClass(this, TextView.class, textView -> textView.getText().equals(getTitle()));
+        return children.isEmpty() ? null : children.get(0);
+    }
+
+    @Nullable
+    public TextView findSubtitleTextView() {
+        List<TextView> children = ViewUtils.findChildrenByClass(this, TextView.class, textView -> textView.getText().equals(getSubtitle()));
         return children.isEmpty() ? null : children.get(0);
     }
 

lib/android/app/src/main/java/com/reactnativenavigation/views/topbar/TopBar.java

     }
 
     public void setSubtitleFontFamily(Typeface fontFamily) {
+        titleBar.setSubtitleTypeface(fontFamily);
+    }
 
+    public void setSubtitleFontSize(float size) {
+        titleBar.setSubtitleFontSize(size);
     }
 
     public void setTestId(String testId) {