我目前的这段代码用于创建UISearchBar(改编自之前的stackoverflow示例):UISearchBar*searchBar=[[UISearchBaralloc]initWithFrame:CGRectZero];[searchBarsizeToFit];//searchBar.delegate=self;searchBar.placeholder=@"Searchmessages,listenersorstations";self.tableView.tableHeaderView=searchBar;UISearchDisplayController*searchDC