为了了解 UISearchDisplayController 的工作原理,我在 viewDidLoad 方法中编写了以下代码:
UISearchBar * searchBar = [[[UISearchBar alloc] initWithFrame:CGRectMake(0.0f, 0.0f, 320.0f, 40.0f)] autorelease];
searchBar.delegate = self;
searchBar.showsCancelButton = YES;
_searchController = [[UISearchDisplayController alloc] initWithSearchBar:searchBar contentsController:self];
_searchController.delegate = self;
_searchController.searchResultsDataSource = self;
_searchController.searchResultsDelegate = self;
[_searchController setActive:YES animated:YES];
[_searchController.searchBar becomeFirstResponder];
但是当我运行我的代码时,UISearchBar 没有显示,如您在图像中看到的那样。