问题描述
我在包含 UITableView
的 ma UIViewcontroller
中使用 UISearchController,我在 viewDidLoad
中执行此操作:
I'm using a UISearchController inside ma UIViewcontroller
that contains a UITableView
, I do this in viewDidLoad
:
self.searchController = [[UISearchController alloc] initWithSearchResultsController:nil];
self.searchController.delegate = self;
self.searchController.searchResultsUpdater = self;
self.searchController.searchBar.delegate = self;
self.searchController.dimsBackgroundDuringPresentation = NO;
self.searchController.hidesNavigationBarDuringPresentation = NO;
self.definesPresentationContext = NO;
当我按下导航栏中的按钮时,我会这样做:
when I push a button in the navbar i do this:
self.tableView.contentOffset = CGPointMake(0, 0 - self.tableView.contentInset.top);
self.tableView.tableHeaderView = self.searchController.searchBar;
[self.searchController.searchBar becomeFirstResponder];
一切正常,但是当我从 UITableView
结果中的一行推送 UIViewController
时,UISearchBar
留在那里并显示在另一个视图的内容,我如何在推送视图时关闭并在返回查看 UITableView
的结果时显示?
all works fine, but when I push a UIViewController
from a row in the UITableView
results the UISearchBar
stay there and display also on the content of the other view, how can i dismiss when I push a view and present when I go back to see the result of the UITableView
?
谢谢
这是didSelectRowAtIndexPath
方法的代码:
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
[self.tableView deselectRowAtIndexPath:indexPath animated:YES];
DetailListController *detailList = [[DetailListController alloc] init];
[self.navigationController pushViewController:detailList animated:YES];
}
推荐答案
试试apple推荐的这个标准方法:
Try this standard way suggested by apple:
声明属性:
@interface APLMainTableViewController () <UISearchBarDelegate, UISearchControllerDelegate, UISearchResultsUpdating>
@property (nonatomic, strong) UISearchController *searchController;
// our secondary search results table view
@property (nonatomic, strong) APLResultsTableController *resultsTableController;
// for state restoration
@property BOOL searchControllerWasActive;
@property BOOL searchControllerSearchFieldWasFirstResponder;
@end
- (void)viewDidLoad {
[super viewDidLoad];
_resultsTableController = [[APLResultsTableController alloc] init];
_searchController = [[UISearchController alloc] initWithSearchResultsController:self.resultsTableController];
self.searchController.searchResultsUpdater = self;
[self.searchController.searchBar sizeToFit];
self.tableView.tableHeaderView = self.searchController.searchBar;
// we want to be the delegate for our filtered table so didSelectRowAtIndexPath is called for both tables
self.resultsTableController.tableView.delegate = self;
self.searchController.delegate = self;
self.searchController.dimsBackgroundDuringPresentation = NO; // default is YES
self.searchController.searchBar.delegate = self; // so we can monitor text changes + others
// Search is now just presenting a view controller. As such, normal view controller
// presentation semantics apply. Namely that presentation will walk up the view controller
// hierarchy until it finds the root view controller or one that defines a presentation context.
//
self.definesPresentationContext = YES; // know where you want UISearchController to be displayed
}
- (void)viewDidAppear:(BOOL)animated {
[super viewDidAppear:animated];
// restore the searchController's active state
if (self.searchControllerWasActive) {
self.searchController.active = self.searchControllerWasActive;
_searchControllerWasActive = NO;
if (self.searchControllerSearchFieldWasFirstResponder) {
[self.searchController.searchBar becomeFirstResponder];
_searchControllerSearchFieldWasFirstResponder = NO;
}
}
}
#pragma mark - UISearchBarDelegate
- (void)searchBarSearchButtonClicked:(UISearchBar *)searchBar {
[searchBar resignFirstResponder];
}
#pragma mark - UISearchControllerDelegate
// Called after the search controller's search bar has agreed to begin editing or when
// 'active' is set to YES.
// If you choose not to present the controller yourself or do not implement this method,
// a default presentation is performed on your behalf.
//
// Implement this method if the default presentation is not adequate for your purposes.
//
- (void)presentSearchController:(UISearchController *)searchController {
}
- (void)willPresentSearchController:(UISearchController *)searchController {
// do something before the search controller is presented
}
- (void)didPresentSearchController:(UISearchController *)searchController {
// do something after the search controller is presented
}
- (void)willDismissSearchController:(UISearchController *)searchController {
// do something before the search controller is dismissed
}
- (void)didDismissSearchController:(UISearchController *)searchController {
// do something after the search controller is dismissed
}
有趣的部分来了:当您从详细信息视图返回时,使用以下代码恢复状态
and here comes the interesting part: Use the below code to restore the status when you comeback from the detail view
#pragma mark - UIStateRestoration
// we restore several items for state restoration:
// 1) Search controller's active state,
// 2) search text,
// 3) first responder
NSString *const ViewControllerTitleKey = @"ViewControllerTitleKey";
NSString *const SearchControllerIsActiveKey = @"SearchControllerIsActiveKey";
NSString *const SearchBarTextKey = @"SearchBarTextKey";
NSString *const SearchBarIsFirstResponderKey = @"SearchBarIsFirstResponderKey";
- (void)encodeRestorableStateWithCoder:(NSCoder *)coder {
[super encodeRestorableStateWithCoder:coder];
// encode the view state so it can be restored later
// encode the title
[coder encodeObject:self.title forKey:ViewControllerTitleKey];
UISearchController *searchController = self.searchController;
// encode the search controller's active state
BOOL searchDisplayControllerIsActive = searchController.isActive;
[coder encodeBool:searchDisplayControllerIsActive forKey:SearchControllerIsActiveKey];
// encode the first responser status
if (searchDisplayControllerIsActive) {
[coder encodeBool:[searchController.searchBar isFirstResponder] forKey:SearchBarIsFirstResponderKey];
}
// encode the search bar text
[coder encodeObject:searchController.searchBar.text forKey:SearchBarTextKey];
}
- (void)decodeRestorableStateWithCoder:(NSCoder *)coder {
[super decodeRestorableStateWithCoder:coder];
// restore the title
self.title = [coder decodeObjectForKey:ViewControllerTitleKey];
// restore the active state:
// we can't make the searchController active here since it's not part of the view
// hierarchy yet, instead we do it in viewWillAppear
//
_searchControllerWasActive = [coder decodeBoolForKey:SearchControllerIsActiveKey];
// restore the first responder status:
// we can't make the searchController first responder here since it's not part of the view
// hierarchy yet, instead we do it in viewWillAppear
//
_searchControllerSearchFieldWasFirstResponder = [coder decodeBoolForKey:SearchBarIsFirstResponderKey];
// restore the text in the search field
self.searchController.searchBar.text = [coder decodeObjectForKey:SearchBarTextKey];
}
@end
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