From e28911721538fa0c2439e92320bad13e3200866f Mon Sep 17 00:00:00 2001
From: Brandon Williams <135203+mbrandonw@users.noreply.github.com>
Date: Wed, 18 Dec 2024 19:27:50 -1000
Subject: [PATCH] Implement the Perceptible macro conformance manually (#256)

* Manually implement Perceptible conformance.

* wip

* fix
---
 Sources/SwiftNavigation/UIBinding.swift | 24 ++++++++++++++++++++----
 1 file changed, 20 insertions(+), 4 deletions(-)

diff --git a/Sources/SwiftNavigation/UIBinding.swift b/Sources/SwiftNavigation/UIBinding.swift
index 2489e881e..f9e72d398 100644
--- a/Sources/SwiftNavigation/UIBinding.swift
+++ b/Sources/SwiftNavigation/UIBinding.swift
@@ -560,11 +560,27 @@ private final class _UIBindingWeakRoot<Root: AnyObject, Value>: _UIBinding, @unc
   }
 }
 
-@Perceptible
-private final class _UIBindingWrapper<Value> {
-  var value: Value
+private final class _UIBindingWrapper<Value>: Perceptible, Observable {
+  var _value: Value
+  var value: Value {
+    get {
+      _$perceptionRegistrar.access(self, keyPath: \.value)
+      return _value
+    }
+    set {
+      _$perceptionRegistrar.withMutation(of: self, keyPath: \.value) {
+        _value = newValue
+      }
+    }
+    _modify {
+      _$perceptionRegistrar.willSet(self, keyPath: \.value)
+      defer { _$perceptionRegistrar.didSet(self, keyPath: \.value) }
+      yield &_value
+    }
+  }
+  let _$perceptionRegistrar = PerceptionRegistrar()
   init(_ value: Value) {
-    self.value = value
+    self._value = value
   }
 }