Add isScrollEnabled property to list Behavior (#543)

- Adds a new `isScrollEnabled` property to List's `Behavior` to disable
scroll view scrolling if needed

CHANGELOG.md

@@ -4,6 +4,8 @@
 
 ### Added
 
+- Added new `isScrollEnabled` property to `Behavior` to disable scrolling on a list if needed.
+
 ### Removed
 
 - Revert: Fixed an issue where animations would occur when dequeuing / reusing cells. A layout is now forced without animation before presentation.

ListableUI/Sources/Behavior.swift

@@ -13,6 +13,9 @@ import UIKit
 /// when the list content underflows the available space in the list view.
 public struct Behavior : Equatable
 {
+    /// Whether the list scroll view should be enabled.
+    public var isScrollEnabled: Bool
+
     /// How the keyboard should be dismissed (if at all) based on scrolling of the list view.
     public var keyboardDismissMode : UIScrollView.KeyboardDismissMode
 
@@ -48,6 +51,7 @@ public struct Behavior : Equatable
 
     /// Creates a new `Behavior` based on the provided parameters.
     public init(
+        isScrollEnabled: Bool = true,
         keyboardDismissMode : UIScrollView.KeyboardDismissMode = .interactive,
         keyboardAdjustmentMode : KeyboardAdjustmentMode = .adjustsWhenVisible,
         scrollsToTop : ScrollsToTop = .enabled,
@@ -59,6 +63,7 @@ public struct Behavior : Equatable
         decelerationRate : DecelerationRate = .normal,
         verticalLayoutGravity : VerticalLayoutGravity = .top
     ) {
+        self.isScrollEnabled = isScrollEnabled
         self.keyboardDismissMode = keyboardDismissMode
         self.keyboardAdjustmentMode = keyboardAdjustmentMode
 

ListableUI/Sources/Layout/ListLayout/ListLayoutScrollViewProperties.swift

@@ -48,6 +48,10 @@ public struct ListLayoutScrollViewProperties : Equatable
         /// because some UIScrollView properties, even when set to the same value, can affect or stop scrolling if it
         /// is in progress. Hard to tell which across iOS versions, so just always be defensive.
 
+        if view.isScrollEnabled != behavior.isScrollEnabled {
+            view.isScrollEnabled = behavior.isScrollEnabled
+        }
+
         let isPagingEnabled = self.isPagingEnabled || behavior.isPagingEnabled
 
         if view.isPagingEnabled != isPagingEnabled {