issue-650: Fixed issue where NavigationBar.backButton would incorrectly be laid…

issue-650: Fixed issue where NavigationBar.backButton would incorrectly be laid out when caching view controllers.

CHANGELOG.md

@@ -3,6 +3,7 @@
 * [pr-979](https://github.com/CosmicMind/Material/pull/979): Added `visibilityOff` icon and updated `TextField` to utilize it.
 * [issue-982](https://github.com/CosmicMind/Material/issues/982): Updated Icon let declarations to var declarations to allow custom icon sets. 
 * [issue-980](https://github.com/CosmicMind/Material/issues/980): Added `@objc` to extension properties in Material+UIView.
+* [issue-650](https://github.com/CosmicMind/Material/issues/650): Fixed issue where `NavigationBar.backButton` would incorrectly be laid out when caching view controllers.
 
 ## 2.12.16
 

Sources/iOS/NavigationController.swift

@@ -173,6 +173,14 @@ extension NavigationController: UINavigationBarDelegate {
         return true
     }
     
+    public func navigationBar(_ navigationBar: UINavigationBar, didPop item: UINavigationItem) {
+        if let index = item.leftViews.index(of: item.backButton) {
+            item.leftViews.remove(at: index)
+        }
+        
+        item.backButton.removeTarget(self, action: #selector(handle(backButton:)), for: .touchUpInside)
+    }
+    
     /// Handler for the backbutton.
     @objc
     internal func handle(backButton: UIButton) {