Add shadow opacity and don't animate view opacity in transition

src/views/StackView/StackViewCard.js

@@ -60,9 +60,8 @@ const styles = StyleSheet.create({
   main: {
     ...StyleSheet.absoluteFillObject,
     backgroundColor: '#E9E9EF',
-    shadowColor: 'black',
-    shadowOffset: { width: 0, height: 0 },
-    shadowOpacity: 0.2,
+    shadowColor: '#000',
+    shadowOffset: { width: -4, height: 0 },
     shadowRadius: 5,
   },
   transparent: {

src/views/StackView/StackViewStyleInterpolator.js

@@ -47,11 +47,6 @@ function forHorizontal(props) {
 
   const { first, last } = interpolate;
   const index = scene.index;
-  const opacity = position.interpolate({
-    inputRange: [first, first + 0.01, index, last - 0.01, last],
-    outputRange: [0, 1, 1, 0.85, 0],
-    extrapolate: 'clamp',
-  });
 
   const width = layout.initWidth;
   const translateX = position.interpolate({
@@ -63,9 +58,15 @@ function forHorizontal(props) {
   });
   const translateY = 0;
 
+  const shadowOpacity = position.interpolate({
+    inputRange: [first, index, last],
+    outputRange: [0.01, 0.2, 0.01],
+    extrapolate: 'clamp',
+  });
+
   return {
-    opacity,
     transform: [{ translateX }, { translateY }],
+    shadowOpacity,
   };
 }
 
@@ -84,12 +85,6 @@ function forVertical(props) {
 
   const { first, last } = interpolate;
   const index = scene.index;
-  const opacity = position.interpolate({
-    inputRange: [first, first + 0.01, index, last - 0.01, last],
-    outputRange: [0, 1, 1, 0.85, 0],
-    extrapolate: 'clamp',
-  });
-
   const height = layout.initHeight;
   const translateY = position.interpolate({
     inputRange: [first, index, last],
@@ -99,7 +94,6 @@ function forVertical(props) {
   const translateX = 0;
 
   return {
-    opacity,
     transform: [{ translateX }, { translateY }],
   };
 }

src/views/StackView/StackViewTransitionConfigs.js

@@ -25,7 +25,7 @@ const SlideFromRightIOS = {
   transitionSpec: IOSTransitionSpec,
   screenInterpolator: StyleInterpolator.forHorizontal,
   containerStyle: {
-    backgroundColor: '#000',
+    backgroundColor: '#eee',
   },
 };
 
@@ -34,7 +34,7 @@ const ModalSlideFromBottomIOS = {
   transitionSpec: IOSTransitionSpec,
   screenInterpolator: StyleInterpolator.forVertical,
   containerStyle: {
-    backgroundColor: '#000',
+    backgroundColor: '#eee',
   },
 };