为什么UISearchBar没有正确显示？

Question

为了理解UISearchDisplayController如何工作，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，因为你可以在图像中看到。

Answer 1

您可以创建UISearchBarcontroller，但不会在uiviewcontroller中添加。所以你在uiviewcontroller中添加了UISearchBarcontroller。

编码：

[self.view addsubview：_searchController];