question: @ Override public void addChild ( WXComponent child , int index ) { if ( child == null || index < - 1 ) { return ; } if ( child instanceof WXBaseRefresh ) { if ( ! checkRefreshOrLoading ( child ) ) { mRefreshs . add ( child ) ; } return ; } if ( mChildren == null ) { mChildren = new ArrayList < > ( ) ; } int count = mChildren . size ( ) ; index = index >= count ? - 1 : index ; if ( index == - 1 ) { mChildren . add ( child ) ; } else { mChildren . add ( index , child ) ; } }
target:  Intercept refresh view and loading view