.

model/Classes/Controllers/Controller/MessageVC/MessageViewController.m

@@ -68,6 +68,15 @@ NSString *const NIMDemoEventNameCloseSnapPicture = @"NIMDemoEventNameCloseSnapPi
     self.tabBarController.tabBar.hidden = NO;
 }
 
+
+- (void)viewDidLayoutSubviews {
+    [super viewDidLayoutSubviews];
+    if ([@"system" isEqualToString:self.session.sessionId]) {
+        self.sessionInputView.hidden = YES;
+        [self.tableView setFrame: CGRectMake(0, self.navigationController.navigationBar.frame.size.height, ScreenWidth, self.view.frame.size.height - self.navigationController.navigationBar.frame.size.height)];
+    }
+}
+
 -(void)rightBtnClick{
     
     if (!_bgblackView) {