可以这样做，自己写一个Controller把，逻辑都放在这里。
然后定义单独的UISearchDisplayController，设置resultDelegate和resultDataSource，代码如下：
MySearchDisplayViewController.h

@interface MySearchDisplayViewController : UIViewController
 <UISearchDisplayDelegate, UITableViewDelegate, UITableViewDataSource>

ViewController.m

MySearchDisplayViewController *mySearchDisplayViewController =  [[MySearchDisplayViewController alloc] init];
UISearchDisplayController *searchDisplayController = [[UISearchDisplayController alloc] initWithSearchBar:self.searchBar contentsController:self];

searchDisplayController.delegate = mySearchDisplayViewController;
searchDisplayController.searchResultsDataSource =  mySearchDisplayViewController;
searchDisplayController.searchResultsDelegate = mySearchDisplayViewController;