我需要使用搜索栏，但我使用了这段代码:self.searchBar=[UISearchBarnew];_searchBar.frame=CGRectMake(0,0,200,44);_searchBar.searchBarStyle=UISearchBarStyleMinimal;_searchBar.placeholder=@"Searchstores";_searchBar.delegate=self;self.searchController=[[UISearchDisplayControlleralloc]initWithSearchBar:_searchBarcontents