我在tableviewcontroller中设置了一个搜索栏.我引用了类似的问题UISearchBar cannot become first responder after UITableView did re-appear，但仍然无法将其设置为第一响应者.
@property (strong, nonatomic) UISearchController *searchController;
@property (strong, nonatomic) IBOutlet UISearchBar *searchBar;
鉴于此:
self.searchController = [[UISearchController alloc]initWithSearchResultsController:nil];
self.searchController.searchResultsUpdater = self;
self.searchController.dimsBackgroundDuringPresentation = NO;
self.searchController.hidesNavigationBarDuringPresentation = NO;
self.searchController.searchBar.frame = CGRectMake(self.searchController.searchBar.frame.origin.x, self.searchController.searchBar.frame.origin.y, self.searchController.searchBar.frame.size.width, 44.0);
self.tableView.tableHeaderView = self.searchController.searchBar;
在视图中出现:
-(void)viewDidAppear:(BOOL)animated {
[self.searchController setActive:YES];
[self.searchController.searchBar becomeFirstResponder];
[super viewDidAppear:animated];
}
当我转到视图时，搜索栏会显示动画，但不会显示键盘.