From 13113c50ed120901b8b1cf1d5a2285fd93af72e1 Mon Sep 17 00:00:00 2001
From: Kyle Matthew Hedden <kyle.hedden@verizonwireless.com>
Date: Fri, 15 Jul 2022 12:24:40 -0400
Subject: [PATCH] behavior transcendence

---
 MVMCoreUI/Atomic/Protocols/TemplateProtocol.swift        | 2 +-
 .../Protocols/PageBehaviorHandlerProtocol.swift          | 9 +++++++--
 MVMCoreUI/Behaviors/Protocols/PageBehaviorProtocol.swift | 7 +++++++
 3 files changed, 15 insertions(+), 3 deletions(-)

diff --git a/MVMCoreUI/Atomic/Protocols/TemplateProtocol.swift b/MVMCoreUI/Atomic/Protocols/TemplateProtocol.swift
index ba1db7fb..144001bc 100644
--- a/MVMCoreUI/Atomic/Protocols/TemplateProtocol.swift
+++ b/MVMCoreUI/Atomic/Protocols/TemplateProtocol.swift
@@ -42,7 +42,7 @@ public extension TemplateProtocol {
         behaviorHandlerModel.traverseAndAddRequiredBehaviors()
         behaviorHandler.createBehaviors(for: behaviorHandlerModel, delegateObject: delegateObject)
         if let viewController = self as? UIViewController {
-            MVMCoreUISession.sharedGlobal()?.applyGlobalBehaviors(to: (viewController))
+            MVMCoreUISession.sharedGlobal()?.applyGlobalBehaviors(to: viewController)
         }
     }
     
diff --git a/MVMCoreUI/Behaviors/Protocols/PageBehaviorHandlerProtocol.swift b/MVMCoreUI/Behaviors/Protocols/PageBehaviorHandlerProtocol.swift
index 79f3364f..971a052b 100644
--- a/MVMCoreUI/Behaviors/Protocols/PageBehaviorHandlerProtocol.swift
+++ b/MVMCoreUI/Behaviors/Protocols/PageBehaviorHandlerProtocol.swift
@@ -14,12 +14,17 @@ public protocol PageBehaviorHandlerProtocol {
 public extension PageBehaviorHandlerProtocol {
     /// Creates the behaviors and sets the variable.
     mutating func createBehaviors(for model: PageBehaviorHandlerModelProtocol, delegateObject: MVMCoreUIDelegateObject?) {
-        guard let behaviorModels = model.behaviors else {
+        
+        behaviors = behaviors?.filter { $0.transcendsPageUpdates }
+        if behaviors?.isEmpty ?? false {
             behaviors = nil
+        }
+        
+        guard let behaviorModels = model.behaviors else {
             return
         }
         
-        var behaviors: [PageBehaviorProtocol] = []
+        var behaviors: [PageBehaviorProtocol] = behaviors ?? []
         
         for behaviorModel in behaviorModels {
             do {
diff --git a/MVMCoreUI/Behaviors/Protocols/PageBehaviorProtocol.swift b/MVMCoreUI/Behaviors/Protocols/PageBehaviorProtocol.swift
index 2e8fbd69..453041c2 100644
--- a/MVMCoreUI/Behaviors/Protocols/PageBehaviorProtocol.swift
+++ b/MVMCoreUI/Behaviors/Protocols/PageBehaviorProtocol.swift
@@ -9,10 +9,17 @@
 
 public protocol PageBehaviorProtocol: ModelHandlerProtocol {
     
+    /// Should the behavior persist regardless of page behavior model updates.
+    var transcendsPageUpdates: Bool { get }
+    
     /// Initializes the behavior with the model
     init(model: PageBehaviorModelProtocol, delegateObject: MVMCoreUIDelegateObject?)
 }
 
+public extension PageBehaviorProtocol {
+    var transcendsPageUpdates: Bool { return false }
+}
+
 /**
     Behavior conforming protocols. Behaviors will conform to one or more of these protocols to receive page lifecycle events that pertain to them.
  */