From 567242b2ab07c5351589b5595c041341660d9fa1 Mon Sep 17 00:00:00 2001
From: Kacper Kafara <kacperkafara@gmail.com>
Date: Tue, 10 Dec 2024 13:04:15 +0100
Subject: [PATCH] Restore behaviour of StackAnimationNone - PoC (there is still
 some header animation)

---
 ios/RNSScreenStackAnimator.mm | 74 ++++++++++++++++++++++++++---------
 1 file changed, 56 insertions(+), 18 deletions(-)

diff --git a/ios/RNSScreenStackAnimator.mm b/ios/RNSScreenStackAnimator.mm
index 65a99f284..2a7f8c9b3 100644
--- a/ios/RNSScreenStackAnimator.mm
+++ b/ios/RNSScreenStackAnimator.mm
@@ -59,7 +59,7 @@ - (NSTimeInterval)transitionDuration:(id<UIViewControllerContextTransitioning>)t
   }
 
   if (screen != nil && screen.stackAnimation == RNSScreenStackAnimationNone) {
-    return 0;
+    return 0.0;
   }
 
   if (screen != nil && screen.transitionDuration != nil && [screen.transitionDuration floatValue] >= 0) {
@@ -489,6 +489,34 @@ - (void)animateWithNoAnimation:(id<UIViewControllerContextTransitioning>)transit
   }
 }
 
+- (void)animateNoneWithTransitionContext:(id<UIViewControllerContextTransitioning>)transitionContext
+                                    toVC:(UIViewController *)toViewController
+                                  fromVC:(UIViewController *)fromViewController
+{
+  if (_operation == UINavigationControllerOperationPush) {
+    [[transitionContext containerView] addSubview:toViewController.view];
+    [UIView animateWithDuration:[self transitionDuration:transitionContext]
+        animations:^{
+          toViewController.view.alpha = 1.0;
+        }
+        completion:^(BOOL finished) {
+          toViewController.view.alpha = 1.0;
+          [transitionContext completeTransition:![transitionContext transitionWasCancelled]];
+        }];
+  } else if (_operation == UINavigationControllerOperationPop) {
+    [[transitionContext containerView] insertSubview:toViewController.view belowSubview:fromViewController.view];
+
+    [UIView animateWithDuration:[self transitionDuration:transitionContext]
+        animations:^{
+          fromViewController.view.alpha = 0.0;
+        }
+        completion:^(BOOL finished) {
+          fromViewController.view.alpha = 1.0;
+          [transitionContext completeTransition:![transitionContext transitionWasCancelled]];
+        }];
+  }
+}
+
 #pragma mark - Public API
 
 - (nullable id<UITimingCurveProvider>)timingParamsForAnimationCompletion
@@ -509,24 +537,34 @@ - (void)animateTransitionWithStackAnimation:(RNSScreenStackAnimation)animation
                                        toVC:(UIViewController *)toVC
                                      fromVC:(UIViewController *)fromVC
 {
-  if (animation == RNSScreenStackAnimationSimplePush) {
-    [self animateSimplePushWithShadowEnabled:shadowEnabled transitionContext:transitionContext toVC:toVC fromVC:fromVC];
-    return;
-  } else if (animation == RNSScreenStackAnimationSlideFromLeft) {
-    [self animateSlideFromLeftWithTransitionContext:transitionContext toVC:toVC fromVC:fromVC];
-    return;
-  } else if (animation == RNSScreenStackAnimationFade || animation == RNSScreenStackAnimationNone) {
-    [self animateFadeWithTransitionContext:transitionContext toVC:toVC fromVC:fromVC];
-    return;
-  } else if (animation == RNSScreenStackAnimationSlideFromBottom) {
-    [self animateSlideFromBottomWithTransitionContext:transitionContext toVC:toVC fromVC:fromVC];
-    return;
-  } else if (animation == RNSScreenStackAnimationFadeFromBottom) {
-    [self animateFadeFromBottomWithTransitionContext:transitionContext toVC:toVC fromVC:fromVC];
-    return;
+  switch (animation) {
+    case RNSScreenStackAnimationSimplePush:
+      [self animateSimplePushWithShadowEnabled:shadowEnabled
+                             transitionContext:transitionContext
+                                          toVC:toVC
+                                        fromVC:fromVC];
+      return;
+    case RNSScreenStackAnimationSlideFromLeft:
+      [self animateSlideFromLeftWithTransitionContext:transitionContext toVC:toVC fromVC:fromVC];
+      return;
+    case RNSScreenStackAnimationFade:
+      [self animateFadeWithTransitionContext:transitionContext toVC:toVC fromVC:fromVC];
+      return;
+    case RNSScreenStackAnimationSlideFromBottom:
+      [self animateSlideFromBottomWithTransitionContext:transitionContext toVC:toVC fromVC:fromVC];
+      return;
+    case RNSScreenStackAnimationFadeFromBottom:
+      [self animateFadeFromBottomWithTransitionContext:transitionContext toVC:toVC fromVC:fromVC];
+      return;
+    case RNSScreenStackAnimationNone:
+      [self animateNoneWithTransitionContext:transitionContext toVC:toVC fromVC:fromVC];
+    default:
+      // simple_push is the default custom animation
+      [self animateSimplePushWithShadowEnabled:shadowEnabled
+                             transitionContext:transitionContext
+                                          toVC:toVC
+                                        fromVC:fromVC];
   }
-  // simple_push is the default custom animation
-  [self animateSimplePushWithShadowEnabled:shadowEnabled transitionContext:transitionContext toVC:toVC fromVC:fromVC];
 }
 
 + (UISpringTimingParameters *)defaultSpringTimingParametersApprox