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.当我说活动时,我的意思是键盘出现,用户可以键入他/她的搜索而不点击搜索栏.
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];
}
我试图使我的搜索控制器处于活动状态,调用[self.searchController.searchBar becomeFirstResponder]并直接调用searchBarSearchButtonClicked,但没有任何作用.
解决方法
试着打电话
[self.searchController setActive:YES]
之前
[self.searchController.searchBar becomeFirstResponder]
- (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;
}
