diff --git a/RefreshControl/XHRefreshControl.h b/RefreshControl/XHRefreshControl.h
index 0399eb4..ff09234 100644
--- a/RefreshControl/XHRefreshControl.h
+++ b/RefreshControl/XHRefreshControl.h
@@ -32,13 +32,6 @@ typedef NS_ENUM(NSInteger, XHPullDownRefreshViewType) {
  */
 - (void)beginLoadMoreRefreshing;
 
-/**
- *  3、最后更新数据的时间
- *
- *  @return 返回缓存最后更新某个页面的时间
- */
-- (NSString *)lastUpdateTimeString;
-
 @optional
 /**
  *  1、是否支持下拉刷新
@@ -116,6 +109,14 @@ typedef NS_ENUM(NSInteger, XHPullDownRefreshViewType) {
  */
 - (UIButton *)customLoadMoreButton;
 
+/**
+ *  11、最后更新数据的时间
+ *
+ *  @return 返回缓存最后更新某个页面的时间
+ */
+- (NSString *)lastUpdateTimeString;
+
+
 @end
 
 @interface XHRefreshControl : NSObject
diff --git a/RefreshControl/XHRefreshControl.m b/RefreshControl/XHRefreshControl.m
index 0a050e5..e4e690a 100644
--- a/RefreshControl/XHRefreshControl.m
+++ b/RefreshControl/XHRefreshControl.m
@@ -177,9 +177,11 @@ - (void)endMoreOverWithMessage:(NSString *)message {
 #pragma mark - Refresh Time Helper Method
 
 - (void)setupRefreshTime {
-    NSString *dateString = [self.delegate lastUpdateTimeString];
-    if ([dateString isKindOfClass:[NSString class]] || dateString) {
-        self.refreshCircleContainerView.timeLabel.text = dateString;
+    if ([self.delegate respondsToSelector:@selector(lastUpdateTimeString)]) {
+        NSString *dateString = [self.delegate lastUpdateTimeString];
+        if ([dateString isKindOfClass:[NSString class]] || dateString) {
+            self.refreshCircleContainerView.timeLabel.text = dateString;
+        }
     }
 }