IssueNo:https://gitee.com/openharmony/graphic_ui/issues/I3ZW8W

Description:fix uilabel bug
Sig:graphic
Feature or Bugfix:Bugfix
Binary Source:No
Signed-off-by: Nwangtiantian <wangtiantian19@huawei.com>

frameworks/components/ui_label.cpp

@@ -70,6 +70,9 @@ public:
             preRunTime_ = curTime;
             return;
         }
+        if (curTime == preRunTime_) {
+            return;
+        }
         uint32_t time = (curTime > preRunTime_) ? (curTime - preRunTime_) : (UINT32_MAX - preRunTime_ + curTime);
         // 1000: 1000 milliseconds is 1 second
         float floatStep = (static_cast<float>(time * speed_) / 1000) + decimal_;