fix |> 19889 疑难-竖屏直播间，评论区顶部应是渐隐效果，见截图，参考安卓。

@@ -10,54 +10,57 @@ export struct ChatItemComponent {
   }
 
   build() {
-    Row() {
-      Text() {
-        if (this.item.role == LiveMessageRole.host) {
-          Span(' 主持人 ')
-            .fontSize(11)
-            // .lineHeight(16)
-            .textBackgroundStyle({ color: "#70FFC63F", radius: 2 })
-            .fontColor('#FFFFFFFF')
-            .fontFamily('PingFang SC-Regular')
-            .fontWeight(400)
-          Span(' ')
-        }
-        if (this.item.role == LiveMessageRole.guest) {
-          Span(' 嘉宾 ')
-            .fontSize(11)
-            // .lineHeight(16)
-            .textBackgroundStyle({ color: "#70FFC63F", radius: 2 })
+    Row(){
+      Row() {
+        Text() {
+          if (this.item.role == LiveMessageRole.host) {
+            Span(' 主持人 ')
+              .fontSize(11)
+                // .lineHeight(16)
+              .textBackgroundStyle({ color: "#70FFC63F", radius: 2 })
+              .fontColor('#FFFFFFFF')
+              .fontFamily('PingFang SC-Regular')
+              .fontWeight(400)
+            Span(' ')
+          }
+          if (this.item.role == LiveMessageRole.guest) {
+            Span(' 嘉宾 ')
+              .fontSize(11)
+                // .lineHeight(16)
+              .textBackgroundStyle({ color: "#70FFC63F", radius: 2 })
+              .fontColor('#FFFFFFFF')
+              .fontFamily('PingFang SC-Regular')
+              .fontWeight(400)
+            Span(' ')
+          }
+          Span(this.item.senderUserName + ': ')
+            .fontSize(14)
+            .lineHeight(22)
+            .fontColor('#FFFFC63F')
+            .padding({ right: 118 })
+            .fontFamily('PingFang SC-Semibold')
+            .fontWeight(600)
+
+          Span(this.item.text)
+            .fontSize(14)
+            .lineHeight(22)
             .fontColor('#FFFFFFFF')
-            .fontFamily('PingFang SC-Regular')
-            .fontWeight(400)
-          Span(' ')
+            .fontFamily('PingFang SC-Semibold')
+            .fontWeight(600)
         }
-        Span(this.item.senderUserName + ': ')
-          .fontSize(14)
-          .lineHeight(22)
-          .fontColor('#FFFFC63F')
-          .padding({ right: 118 })
-          .fontFamily('PingFang SC-Semibold')
-          .fontWeight(600)
+        .textShadow({ offsetX: 1, offsetY: 1, color: '#4D000000', radius: 1 })
 
-        Span(this.item.text)
-          .fontSize(14)
-          .lineHeight(22)
-          .fontColor('#FFFFFFFF')
-          .fontFamily('PingFang SC-Semibold')
-          .fontWeight(600)
       }
-      .textShadow({ offsetX: 1, offsetY: 1, color: '#4D000000', radius: 1 })
-
-    }
-    .backgroundColor('#4D000000')
-    .borderRadius(3)
-    .padding({
-      top: 6,
-      bottom: 6,
-      left: 8,
-      right: 8
-    })
-    .margin({ left: 16, bottom: 4 })
+      .backgroundColor('#4D000000')
+      .borderRadius(3)
+      .padding({
+        top: 6,
+        bottom: 6,
+        left: 8,
+        right: 8
+      })
+      .margin({ left: 16, bottom: 4 })
+    }.width("100%")
+    .backgroundColor(Color.Transparent)
   }
 }
\ No newline at end of file

@@ -100,16 +100,22 @@ export struct PlayerCommentComponent {
           ForEach(this.liveChatList, (item: LiveRoomItemBean) => {
             ListItem() {
               ChatItemComponent({ item: item })
-            }
+            }.blendMode(BlendMode.SRC_IN, BlendApplyType.OFFSCREEN)
           })
         }
-        .width('80%')
+        .width('100%')
         .scrollBar(BarState.Off)
+        .edgeEffect(EdgeEffect.None)
 
       }
       .constraintSize({
         maxHeight: 280
+      }).width("80%")
+      .linearGradient({ angle: 0,
+        colors: [[0xff000000, 0.85], [0x01000000, 1.0]]
       })
+      .blendMode(BlendMode.SRC_OVER, BlendApplyType.OFFSCREEN)
+
 
       // 收藏、分享、点赞是否需要根据字段显隐
       LiveOperRowListView({