修改弹幕相关问题 review by阿瑟

@@ -11,7 +11,7 @@
 #import "YH_BarrageMsgCell.h"
 #import "YH_BarrageJoinCell.h"
 #import "UtilsMacros.h"
-
+#import <pthread.h>
 #define kMessageCellID @"MessageCelliden"
 #define kJoinCellID @"JoinCellIden"
 #define MaxMessageCacheCapacity 20
@@ -142,7 +142,8 @@
 
 - (void)newUserJoin:(NSDictionary *)item {
     __weak typeof (self) weakSelf = self;
-    dispatch_sync(dispatch_get_main_queue(), ^{
+    if (pthread_main_np() != 0) {
+        // main thread
         [weakSelf caculateContentInset];
         YH_BarrageMsgModel *newMessage = [[YH_BarrageMsgModel alloc]initWithDictionary:item error:nil];
         YH_BarrageMsgModel *oldMessage = [weakSelf.dataMutableArray lastObject];
@@ -156,10 +157,24 @@
         [weakSelf reloadData];
         CGPoint bottomOffset = CGPointMake(0, weakSelf.contentSize.height - weakSelf.bounds.size.height);
         [weakSelf setContentOffset:bottomOffset animated:YES];
-        
-        
-        
-    });
+    }else {
+        dispatch_sync(dispatch_get_main_queue(), ^{
+            [weakSelf caculateContentInset];
+            YH_BarrageMsgModel *newMessage = [[YH_BarrageMsgModel alloc]initWithDictionary:item error:nil];
+            YH_BarrageMsgModel *oldMessage = [weakSelf.dataMutableArray lastObject];
+            
+            if ([weakSelf.dataMutableArray count] && oldMessage && oldMessage.cmd == newMessage.cmd && oldMessage.cmd == 4) {
+                [weakSelf.dataMutableArray replaceObjectAtIndex:[weakSelf.dataMutableArray count]-1 withObject:newMessage];
+            } else {
+                [weakSelf.dataMutableArray addObject:newMessage];
+            }
+            
+            [weakSelf reloadData];
+            CGPoint bottomOffset = CGPointMake(0, weakSelf.contentSize.height - weakSelf.bounds.size.height);
+            [weakSelf setContentOffset:bottomOffset animated:YES];
+        });
+    }
+    
 }
 // 将缓冲区中的数据存入tableview的数据源
 - (void)appendCacheToDataArray {
@@ -189,15 +204,24 @@
 // 如果返回的数据是本机用户所发，则立即显示，不需要走缓冲策略，直接加入到tableview数据源，刷新列表
 - (void)greenChannel:(NSDictionary *)item {
     __weak typeof (self) weakSelf = self;
-    dispatch_sync(dispatch_get_main_queue(), ^{
+    if (pthread_main_np() != 0) {
+        // main thread
         [weakSelf caculateContentInset];
         YH_BarrageMsgModel *message = [[YH_BarrageMsgModel alloc]initWithDictionary:item error:nil];
         [weakSelf.dataMutableArray addObject:message];
         [weakSelf reloadData];
         CGPoint bottomOffset = CGPointMake(0, weakSelf.contentSize.height - weakSelf.bounds.size.height);
         [weakSelf setContentOffset:bottomOffset animated:YES];
-    });
-
+    }else {
+        dispatch_sync(dispatch_get_main_queue(), ^{
+            [weakSelf caculateContentInset];
+            YH_BarrageMsgModel *message = [[YH_BarrageMsgModel alloc]initWithDictionary:item error:nil];
+            [weakSelf.dataMutableArray addObject:message];
+            [weakSelf reloadData];
+            CGPoint bottomOffset = CGPointMake(0, weakSelf.contentSize.height - weakSelf.bounds.size.height);
+            [weakSelf setContentOffset:bottomOffset animated:YES];
+        });
+    }
     
 }