iOS: add enable gallery

doric-iOS/Pod/Classes/Shader/DoricSliderLayout.h

@@ -25,5 +25,6 @@
 @property(nonatomic, assign) CGFloat galleryItemWidth;
 @property(nonatomic, assign) CGFloat galleryMinScale;
 @property(nonatomic, assign) CGFloat galleryMinAlpha;
+@property(nonatomic, assign) BOOL enableGallery;
 @end
 

doric-iOS/Pod/Classes/Shader/DoricSliderLayout.m

@@ -24,6 +24,7 @@
 @implementation DoricSliderLayout
 
 - (NSArray<UICollectionViewLayoutAttributes *> *)layoutAttributesForElementsInRect:(CGRect)rect {
+    if (self.enableGallery) {
         NSArray *attributes = [super layoutAttributesForElementsInRect:rect];
         CGRect visitRect = {self.collectionView.contentOffset, self.collectionView.bounds.size};
         NSMutableArray *attributesCopy = [NSMutableArray array];
@@ -50,6 +51,9 @@ @implementation DoricSliderLayout
             attribute.transform3D = scaleTransform;
         }
         return attributesCopy;
+    } else {
+        return [super layoutAttributesForElementsInRect:rect];
+    }
 }
 
 - (BOOL)shouldInvalidateLayoutForBoundsChange:(CGRect)newBounds {

doric-iOS/Pod/Classes/Shader/DoricSliderNode.m

@@ -131,6 +131,7 @@ - (void)blendView:(UICollectionView *)view forPropName:(NSString *)name propValu
                 layout.galleryItemWidth = self.galleryItemWidth;
                 layout.galleryMinScale = self.galleryMinScale;
                 layout.galleryMinAlpha = self.galleryMinAlpha;
+                layout.enableGallery = YES;
             }
             
         } else if ([prop isKindOfClass:NSString.class]) {