Question

我已经在navigatiom栏中实现了一个带有搜索栏的UISearchController，我想在加载视图时使搜索栏处于活动状态。当我说有效时，我的意思是键盘出现，用户可以在不点击搜索栏的情况下输入他/她的搜索。

我使用以下代码初始化了UISearchController：

- (void)viewDidLoad
{
    self.searchController = [[UISearchController alloc] initWithSearchResultsController:nil];
    [self.searchController setSearchResultsUpdater:self];
    [self.searchController setDimsBackgroundDuringPresentation:NO];
    [self.searchController setHidesNavigationBarDuringPresentation:NO];
    [self.navigationItem setTitleView:self.searchController.searchBar];

    [self setDefinesPresentationContext:YES];

    [self.searchController.searchBar setDelegate:self];
    [self.searchController.searchBar setShowsCancelButton:YES];
    [self.searchController.searchBar setPlaceholder:@"City or Airfield"];

    [self.searchController.searchBar sizeToFit];
}

我尝试将我的搜索控制器设为有效，请致电[self.searchController.searchBar becomeFirstResponder]并直接致电searchBarSearchButtonClicked，但无效。

Answer 1

尝试拨打

[self.searchController setActive:YES]

之前

[self.searchController.searchBar becomeFirstResponder]

如果上述方法不起作用，请尝试以下方法：

- (void)viewDidLoad {
    [super viewDidLoad];
    ...
    [self initializeSearchController];
    ....
}

- (void)viewDidAppear:(BOOL)animated {
    [super viewDidAppear:animated];
    [self.searchController setActive:YES];
    [self.searchController.searchBar becomeFirstResponder];
}

- (void)initializeSearchController {
    self.searchController = [[UISearchController alloc] initWithSearchResultsController:nil];
    self.searchController.searchResultsUpdater = self;
    self.searchController.dimsBackgroundDuringPresentation = NO;
    self.searchController.delegate = self;
    self.searchController.searchBar.delegate = self;
    [self.searchController.searchBar sizeToFit];

    [self.tableView setTableHeaderView:self.searchController.searchBar];
    self.definesPresentationContext = YES;
}

Answer 2

要激活搜索栏：

- (void)viewDidAppear:(BOOL)animated {
    [super viewDidAppear:animated];
    [self.searchController setActive:YES];
}

＆＃34; becomeFistResponder＆＃34;只有在加载UISearchController时才能调用键盘。

- (void)didPresentSearchController:(UISearchController *)searchController
{
    [searchController.searchBar becomeFirstResponder];
}

Answer 3

除了做其他用户建议的内容外，我还做了以下工作，并且有效：

searchController.definesPresentationContext = YES;

使UISearchController搜索栏自动激活

3 个答案: