show nav bar when user taps the status bar

apple/OmnivoreKit/Sources/Views/Article/WebAppViewCoordinator.swift

@@ -16,6 +16,12 @@ final class WebAppViewCoordinator: NSObject {
   override init() {
     super.init()
   }
+
+  var navBarVisibilityRatio: Double = 1.0 {
+    didSet {
+      updateNavBarVisibilityRatio(navBarVisibilityRatio)
+    }
+  }
 }
 
 extension WebAppViewCoordinator: WKScriptMessageHandler {
@@ -51,13 +57,13 @@ extension WebAppViewCoordinator: UIScrollViewDelegate {
 
     if yOffset <= 0 {
       isNavBarHidden = false
-      updateNavBarVisibilityRatio(1)
+      navBarVisibilityRatio = 1
       return
     }
 
     if yOffset < navBarHeight {
       let isScrollingUp = yOffsetAtStartOfDrag ?? 0 > yOffset
-      updateNavBarVisibilityRatio(isScrollingUp ? 1 : 1 - (yOffset / navBarHeight))
+      navBarVisibilityRatio = isScrollingUp ? 1 : 1 - (yOffset / navBarHeight)
       return
     }
 
@@ -67,17 +73,26 @@ extension WebAppViewCoordinator: UIScrollViewDelegate {
       let translation = yOffset - yOffsetAtStartOfDrag
       let ratio = translation < navBarHeight ? 1 - (translation / navBarHeight) : 0
       isNavBarHidden = ratio == 0
-      updateNavBarVisibilityRatio(ratio)
+      navBarVisibilityRatio = ratio
     }
   }
 
   func scrollViewDidEndDragging(_ scrollView: UIScrollView, willDecelerate decelerate: Bool) {
     if decelerate, scrollView.contentOffset.y < (yOffsetAtStartOfDrag ?? 0) {
-      updateNavBarVisibilityRatio(1)
+      navBarVisibilityRatio = 1
       isNavBarHidden = false
     }
     yOffsetAtStartOfDrag = nil
   }
+
+  func scrollViewShouldScrollToTop(_: UIScrollView) -> Bool {
+    if navBarVisibilityRatio == 1 {
+      return true
+    } else {
+      navBarVisibilityRatio = 1
+      return false
+    }
+  }
 }
 
 struct WebViewConfig {