From 0889a57a680a69d9e38a259d87374e4e5a980bbf Mon Sep 17 00:00:00 2001
From: "pengfei.zhou" <pengfeizhou@foxmail.com>
Date: Tue, 10 Dec 2019 19:54:53 +0800
Subject: [PATCH] feat:async blend sub node of list

---
 Pod/Classes/Shader/DoricListNode.m | 44 ++++++++++++++++++------------
 1 file changed, 26 insertions(+), 18 deletions(-)

diff --git a/Pod/Classes/Shader/DoricListNode.m b/Pod/Classes/Shader/DoricListNode.m
index a5ff7277..668fad3a 100644
--- a/Pod/Classes/Shader/DoricListNode.m
+++ b/Pod/Classes/Shader/DoricListNode.m
@@ -182,29 +182,37 @@ - (NSDictionary *)itemModelAt:(NSUInteger)position {
             NSUInteger pos = position + idx;
             self.itemViewIds[@(pos)] = thisViewId;
         }];
-        return array[0];
+        if (array.count > 0) {
+            return array[0];
+        } else {
+            return nil;
+        }
     }
 }
 
 - (void)blendSubNode:(NSDictionary *)subModel {
-    NSString *viewId = subModel[@"id"];
-    DoricViewNode *viewNode = [self subNodeWithViewId:viewId];
-    if (viewNode) {
-        [viewNode blend:subModel[@"props"]];
-    } else {
-        NSMutableDictionary *model = [[self subModelOf:viewId] mutableCopy];
-        [self recursiveMixin:subModel to:model];
-        [self setSubModel:model in:viewId];
-    }
-    [self.itemViewIds enumerateKeysAndObjectsUsingBlock:^(NSNumber *_Nonnull key, NSString *_Nonnull obj, BOOL *_Nonnull stop) {
-        if ([viewId isEqualToString:obj]) {
-            *stop = YES;
-            NSIndexPath *indexPath = [NSIndexPath indexPathForRow:[key integerValue] inSection:0];
-            [UIView performWithoutAnimation:^{
-                [self.view reloadRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationNone];
-            }];
+    ///Here async blend sub node because the item count need to be applied first.
+    dispatch_async(dispatch_get_main_queue(), ^{
+        NSString *viewId = subModel[@"id"];
+        DoricViewNode *viewNode = [self subNodeWithViewId:viewId];
+        if (viewNode) {
+            [viewNode blend:subModel[@"props"]];
+        } else {
+            NSMutableDictionary *model = [[self subModelOf:viewId] mutableCopy];
+            [self recursiveMixin:subModel to:model];
+            [self setSubModel:model in:viewId];
         }
-    }];
+        [self.itemViewIds enumerateKeysAndObjectsUsingBlock:^(NSNumber *_Nonnull key, NSString *_Nonnull obj, BOOL *_Nonnull stop) {
+            if ([viewId isEqualToString:obj]) {
+                *stop = YES;
+                NSIndexPath *indexPath = [NSIndexPath indexPathForRow:[key integerValue] inSection:0];
+                [UIView performWithoutAnimation:^{
+                    [self.view reloadRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationNone];
+                }];
+            }
+        }];
+    });
+
 }
 
 - (void)callItem:(NSUInteger)position height:(CGFloat)height {