iphone - 为什么 UISearchBar 显示不正确？

Question

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 不会像您在图像中看到的那样显示。

Answer 1

您创建的 UISearchBarcontroller 很好，但没有添加到 uiviewcontroller 中。所以你在uiviewcontroller中添加UISearchBarcontroller。

编码:

[self.view addsubview:_searchController];