在导航栏 iOS 上添加 UISearchController

Question

我无法在 iOS 9 导航栏上添加 UISearch 控制器。互联网上有很多，但它们都不起作用。。

代码是..

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.

    searchController = [[UISearchController alloc] initWithSearchResultsController:nil];
    searchController.searchResultsUpdater = self;
    searchController.delegate = self;
    searchController.searchBar.delegate = self;
    searchController.hidesNavigationBarDuringPresentation = NO;
    searchController.dimsBackgroundDuringPresentation = YES;

    self.navigationItem.titleView = searchController.searchBar;

    self.definesPresentationContext = YES;

}

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

Answer 1

你应该使用。在您上面的代码中，您的设置为零。所以无法初始化。

[searchController = [UISearchController alloc] initWithSearchResultController:self]

这里是 iOS 8/9 的代码：

UISearchController *searchController = [[UISearchController alloc] initWithSearchResultsController:self];
// Use the current view controller to update the search results.
searchController.searchResultsUpdater = self;
// Install the search bar as the table header.
self.navigationItem.titleView = searchController.searchBar;
// It is usually good to set the presentation context.
self.definesPresentationContext = YES;

希望它能帮助您解决问题。保持你的热情！祝你好运。