下拉刷新 ios

上啦刷新
@property (nonatomic , assign)NSInteger i;
    [self.tableView addLegendHeaderWithRefreshingTarget:self refreshingAction:@selector(headerRereshing)];
    [self.tableView addLegendFooterWithRefreshingTarget:self refreshingAction:@selector(footerRereshing)];
    [self.tableView.header endRefreshing];
 

- (void)headerRereshing
{
    self.arr2 = [NSMutableArray array];
    [self handata2Page:1];
    // 2.2秒后刷新表格UI
    self.i = 1;
 
}
- (void)footerRereshing
{
    // 1.添加假数据
    _i ++;
    [self handata2Page:_i];
 
}
self.tableView.footer.state = MJRefreshFooterStateNoMoreData;
[button setImage:[UIImage imageNamed:self.ImageArr[i]] forState:UIControlStateNormal];