个播房背景显示优化，退房后停掉关注主播定时器

xplan-ios/Main/Room/View/BaseUIContainerView/XPRoomFunctionContainerView.m

@@ -46,6 +46,13 @@
 @end
 
 @implementation XPRoomFunctionContainerView
+
+- (void)dealloc {
+    if (self.followAnchorTimer != nil) {
+        dispatch_source_cancel(self.followAnchorTimer);
+    }
+}
+
 - (instancetype)initWithdelegate:(id<RoomHostDelegate>)delegate {
 	self = [super init];
 	if (self) {
@@ -229,7 +236,10 @@
     dispatch_source_set_event_handler(self.followAnchorTimer, ^{
         dispatch_async(dispatch_get_main_queue(), ^{
             @strongify(self);
-            dispatch_source_cancel(self.followAnchorTimer);
+            if (self.followAnchorTimer != nil) {
+                dispatch_source_cancel(self.followAnchorTimer);
+                self.followAnchorTimer = nil;
+            }
             RoomInfoModel* roomInfo = self.delegate.getRoomInfo;
             NSString *roomUid = [NSString stringWithFormat:@"%zd", roomInfo.uid];
             NSString * uid = [[AccountInfoStorage instance] getUid];