_myTableView =
[[UITableView alloc]initWithFrame:CGRectMake(0, 0, 320, 460-44)style:UITableViewStyleGrouped];
//如果这两句放在UITablView alloc上面,UISearchBar不会显示
//如果这两句放在UITablView alloc上面,UISearchBar不会显示
search = [[UISearchBar alloc]initWithFrame:CGRectMake(10, 0, 300, 44)];
_myTableView.tableHeaderView = search;