- 视图中有多个滚动时候 self.automaticallyAdjustsScrollViewInsets = NO;
- UITableViewStyleGrouped 防止留白
self.tableView_root.tableHeaderView = [[UIView alloc]initWithFrame:CGRectMake(0, 0, 1, 0.5)];
self.tableView_root.sectionFooterHeight = 0.5;
self.tableView_root.tableFooterView = [[UIView alloc]initWithFrame:CGRectMake(0, 0, 1, 0.5)];
self.tableView_root.sectionFooterHeight = 0.5;