ios – 使用UISearchBar的stange行为UIRefreshControl

我正在使用UIrefreshControl与UISearchBar当我拉动刷新时我看到uiviewcontroller顶部的白色背景 @H_801_5@ @H_801_5@

UISearchBar *searchBar =
[[UISearchBar alloc] initWithFrame:
 CGRectMake(0,self.tableView.frame.size.width,44.0)];
searchBar.autocorrectionType = UITextAutocorrectionTypeNo;
self.tableView.tableHeaderView = searchBar;

 _refreshControl = [[UIrefreshControl alloc] init];
[_refreshControl addTarget:self action:@@R_696_10288@ctor(updatE) forControlEvents:UIControlEventValueChanged];
[self.tableView addSubview:_refreshControl];

@H_801_5@问题是上面的白色背景

@H_801_5@有任何想法吗？

- (void)viewDidLoad {
    self.tableView.BACkgroundView = [UIView new];
    self.tableView.BACkgroundView.BACkgroundColor = [UIColor clearColor];
}