UISearchController 的用法［點擊搜索框，自動到頂部］

//在ViewDidLoad里面如下代碼

  self.searchViewController = [[UISearchController alloc]initWithSearchResultsController:nil];
    self.searchViewController.active = NO;
    self.searchViewController.dimsBackgroundDuringPresentation = NO;
    self.searchViewController.hidesNavigationBarDuringPresentation = YES;
    [self.searchViewController.searchBar sizeToFit];
    self.searchViewController.searchBar.barTintColor = kALittleGray;
    //設置顯示搜索結果的控制器
    self.searchViewController.searchResultsUpdater = self; //協議(UISearchResultsUpdating)
    self.searchViewController.delegate = self;

    self.tableView.tableHeaderView = self.searchViewController.searchBar;
    self.searchViewController.searchBar.keyboardType = UIKeyboardAppearanceDefault;
    self.searchViewController.searchBar.placeholder = @"請輸入城市關鍵字";

遵守協議：

UISearchBarDelegate,UISearchControllerDelegate,UISearchResultsUpdating

 

 

 

 

#pragma mark - other delegate

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

    

   

}

 

- (BOOL)searchBarShouldEndEditing:(UISearchBar *)searchBar

{

    return YES;

}