94.大于屏幕宽度的TableView上下拉刷新实现 大于屏幕宽度MJRefresh怎么实现刷新控件显示居中

#pragma mark -UIScrollViewDelegate
-(void)scrollViewDidScroll:(UIScrollView *)scrollView{
if (scrollView.tag == 131420) {
MJRefreshBackNormalFooter *footView = (MJRefreshBackNormalFooter *)_tableView.mj_footer;
footView.stateLabel.frame = CGRectMake(scrollView.contentOffset.x, footView.stateLabel.frame.origin.y, footView.stateLabel.frame.size.width, footView.stateLabel.frame.size.height);
footView.arrowView.center = CGPointMake(footView.stateLabel.center.x - 100, footView.arrowView.center.y);
footView.loadingView.center = CGPointMake(footView.stateLabel.center.x - 100, footView.arrowView.center.y);
MJRefreshNormalHeader *headView = (MJRefreshNormalHeader *)_tableView.mj_header;
headView.stateLabel.frame = CGRectMake(scrollView.contentOffset.x, headView.stateLabel.frame.origin.y, headView.stateLabel.frame.size.width, headView.stateLabel.frame.size.height);
headView.arrowView.center = CGPointMake(headView.stateLabel.center.x - 100, headView.arrowView.center.y);
headView.loadingView.center = CGPointMake(headView.stateLabel.center.x - 100, headView.arrowView.center.y);
headView.lastUpdatedTimeLabel.center = CGPointMake(headView.stateLabel.center.x, headView.lastUpdatedTimeLabel.center.y);
}
}