UIScrollview(UITableView、UICollectionView、WKWebView) inset内容偏移问题

 iOS11是个分界岭

self.extendedLayoutIncludesOpaqueBars = YES;
if (@available(iOS 11.0, *)) {
        self.tableView.contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentNever;
} else {
        self.automaticallyAdjustsScrollViewInsets = NO;
}
_tableView.contentInset = UIEdgeInsetsMake(64, 0, 49, 0);
_tableView.scrollIndicatorInsets = _tableView.contentInset;