关于OS设置的代理没有被调用 的问题

SearchViewController.h

#import 
 #import "search.h"

@interface SearchViewController : UIViewController

@property (nonatomic,strong) id delegate;

@end

SeachViewController.m

(void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText
 {
 if (_searchBar.text.length == 0) {
 [self setSearchControllerHidden:YES];
 }
 else
 {
 _searchController.searchText = _searchBar.text;
 //发送消息
 if ([self.delegate respondsToSelector:@selector(searchTextChange)]) {
 [self.delegate searchTextChange];
 }
[self setSearchControllerHidden:NO];


}
 }


SearchResultController.m

(void)viewDidLoad {
 [super viewDidLoad];

SearchViewController *searchViewVC = [[SearchViewController alloc]init];

searchViewVC.delegate = self;

self.resultList = [[NSMutableArray alloc]initWithObjects:@"1",@"2",@"3",@"4", nil];
 }


(void)searchTextChange
 {
 NSLog(@"%@",self.searchText);
 }