Constrain bottom anchor to keyboard frame height

modules/keyboard-avoiding-view/ios/KeyboardAvoidingView.swift

@@ -14,6 +14,9 @@ class KeyboardAvoidingView: ExpoView, UIGestureRecognizerDelegate {
     return panGestureRecognizer
   }()
   private var isScrollViewPanning = false
+  private lazy var containerBottomAnchorConstraint: NSLayoutConstraint = {
+    return container.bottomAnchor.constraint(equalTo: bottomAnchor)
+  }()
 
   required init(appContext: AppContext? = nil) {
     super.init(appContext: appContext)
@@ -36,7 +39,7 @@ class KeyboardAvoidingView: ExpoView, UIGestureRecognizerDelegate {
       container.heightAnchor.constraint(equalTo: heightAnchor),
       container.leadingAnchor.constraint(equalTo: leadingAnchor),
       container.trailingAnchor.constraint(equalTo: trailingAnchor),
-      container.bottomAnchor.constraint(equalTo: keyboardLayoutGuide.topAnchor),
+      containerBottomAnchorConstraint,
     ])
 
     NotificationCenter.default.addObserver(
@@ -72,7 +75,6 @@ class KeyboardAvoidingView: ExpoView, UIGestureRecognizerDelegate {
   }
 
   @objc private func keyboardWillShow(_ notification: Notification) {
-    keyboardLayoutGuide.followsUndockedKeyboard = true
     updateInsets(notification)
   }
 
@@ -100,6 +102,8 @@ class KeyboardAvoidingView: ExpoView, UIGestureRecognizerDelegate {
 
     UIView.animate(withDuration: animationDuration, delay: 0.0, options: animationOptions) {
       self.scrollView?.setInsetsFromKeyboardHeight(keyboardHeight)
+      self.containerBottomAnchorConstraint.constant = -keyboardHeight
+      self.layoutIfNeeded()
     }
   }
 
@@ -108,7 +112,6 @@ class KeyboardAvoidingView: ExpoView, UIGestureRecognizerDelegate {
       measurer.removeObserver(self, forKeyPath: "center")
       measurerHasObserver = false
     }
-    keyboardLayoutGuide.followsUndockedKeyboard = false
     updateInsets(notification, closing: true)
   }
 
@@ -123,6 +126,8 @@ class KeyboardAvoidingView: ExpoView, UIGestureRecognizerDelegate {
         return
       }
       self.scrollView?.setInsetsFromKeyboardHeight(measurer.frame.height)
+      self.containerBottomAnchorConstraint.constant = -keyboardHeight
+      self.layoutIfNeeded()
     }
   }