UISearchController不把视图控制器推到前面，而是在UISearchController下面

Question

自动表示UISearchController和自己呈现搜索控制器之间的行为不同。

@implementation MyViewComtroller

// click search barbutton on right of navigationBar
- (void)searchAction:(id)sender {
    ArticleSearchViewController *searchResultsController = [[ArticleSearchViewController alloc] init];
    UISearchController *searchController = [[UISearchController alloc] initWithSearchResultsController:searchResultsController];
    searchController.searchResultsUpdater = searchResultsController;
    searchController.searchBar.delegate = searchResultsController;
    searchController.delegate = searchResultsController;
    searchController.hidesNavigationBarDuringPresentation = NO;
    [self presentViewController:searchController animated:YES completion:nil];
}

@end

@implementation ArticleSearchViewController

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    [tableView deselectRowAtIndexPath:indexPath animated:YES];
    ArticleDetailController * articleDetailController = [ArticleDetailController new];
   [(UINavigationController *)self.presentingViewController pushViewController:articleDetailController animated:YES];
}

@end

推操作发生在UISearchController下面。

Answer 1

您以错误的方式呈现搜索控制器。请看文档的一部分。

您可以同时使用搜索控制器和现有的视图控制器。当您有一个具有可搜索内容的视图控制器时，将UISearchController对象的搜索栏合并到视图控制器的接口中。当用户与该搜索栏交互时，搜索控制器将自动显示一个新的视图控制器和您指定的搜索结果。

而不是在主控制器中这样做：

[self presentViewController:searchController animated:YES completion:nil]; 

您应该在iOS 11上这样做：

self.definesPresentationContext = YES;
self.navigationItem.searchController = searchController;

或者在pre iOS 11上：

self.definesPresentationContext = YES;
self.navigationItem.titleView = searchController.searchBar;

或者将searchController.searchBar放置在所呈现的视图层次结构中的任何其他位置。

您还应该在像viewDidLoad这样的地方设置搜索控制器，而不是按下按钮。

您在ArticleSearchViewController中获取对您的ArticleSearchViewController的引用的方式必须更新为以下内容：

[self.presentingViewController.navigationController pushViewController:articleDetailController animated:YES];

具有可搜索内容的视图控制器：

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    [self.view setBackgroundColor:[UIColor blackColor]];

    UIStoryboard *sb = [UIStoryboard storyboardWithName:@"Main" bundle:nil];
    ArticleSearchViewController *searchResultsController = [sb instantiateViewControllerWithIdentifier:@"ArticleSearchViewController"];
    UISearchController *searchController = [[UISearchController alloc] initWithSearchResultsController:searchResultsController];
    searchController.searchResultsUpdater = searchResultsController;
    searchController.searchBar.delegate = searchResultsController;
    searchController.delegate = searchResultsController;
    searchController.hidesNavigationBarDuringPresentation = NO;
//    [self presentViewController:searchController animated:YES completion:nil]; //WRONG
    self.definesPresentationContext = YES;
    self.navigationItem.searchController = searchController;
}

@end

结果主计长：

@implementation ArticleSearchViewController

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    [tableView deselectRowAtIndexPath:indexPath animated:YES];
    UIViewController * articleDetailController = [UIViewController new];
    [self.presentingViewController.navigationController pushViewController:articleDetailController animated:YES];
}

- (void)updateSearchResultsForSearchController:(UISearchController *)searchController {
    // update appropriately
}

@end

Answer 2

这是一个更好的答案：

definesPresentationContext = true

把这个写在你的MyViewController里