UISearchController 很坑

<UISearchControllerDelegate,UISearchResultsUpdating>

//声明
@property (nonatomic,retain) UISearchController *searchController;


- (void)createUI{
    
    self.searchController = [[UISearchController alloc]initWithSearchResultsController:nil];
    self.searchController.delegate= self;
    self.searchController.searchResultsUpdater = self;
    self.searchController.searchBar.barTintColor = BHBackColor;
    self.searchController.searchBar.placeholder= @"车牌号";
    self.searchController.searchBar.searchBarStyle =UISearchBarStyleMinimal;
    
    //    //提前在搜索框内加入搜索词
    //    self.searchController.searchBar.text = @"xxxx";
    
    
    self.searchController.searchBar.tintColor = BHNoticeColor;
    //搜索时，背景变暗色
    self.searchController.dimsBackgroundDuringPresentation = NO;
    //搜索时，背景变模糊
    //    self.searchController.obscuresBackgroundDuringPresentation = NO;
    
    //点击搜索的时候,是否隐藏导航栏
    //    self.searchController.hidesNavigationBarDuringPresentation = NO;
    
   self.searchController.searchBar.frame = CGRectMake(self.searchController.searchBar.frame.origin.x, self.searchController.searchBar.frame.origin.y, self.searchController.searchBar.frame.size.width, 44.0);
    
    self.definesPresentationContext = YES;
    self.searchController.hidesNavigationBarDuringPresentation = NO;
    [self.searchController.searchBar setContentMode:UIViewContentModeLeft];
    
    self.navigationItem.titleView =self.searchController.searchBar;
    UIBarButtonItem *rightBarItem = [[UIBarButtonItem alloc] initWithTitle:@"" style:UIBarButtonItemStylePlain target:nil action:nil];
    self.navigationItem.rightBarButtonItem = rightBarItem;
     [self.view addSubview:self.searchTableView];
   

}








//谓词搜索过滤
-(void)updateSearchResultsForSearchController:(UISearchController *)searchController {

    NSLog(@"搜索");
    
    NSString *searchString = [self.searchController.searchBar text];

//下面处理数据  怎么处理的都可以   这个方法是 searchbar 内容改变一次就调用一次



    
    
}

- (void)viewDidAppear:(BOOL)animated {
    
    [super viewDidAppear:animated];
    
    [self performSelector:@selector(showKeyboard) withObject:nil afterDelay:0];
    
}
- (void)showKeyboard {
    
    [self.searchController.searchBar becomeFirstResponder];
    
}

self.searchController.hidesNavigationBarDuringPresentation = YES; //默认是YES

- (void)updateSearchResultsForSearchController:(UISearchController *)searchController{

  //不要加  self.edgesForExtendedLayout = UIRectEdgeNone;  

}