検索バーのキャンセルボタンが元のテーブルビューとデータを再読み込みしない

Question

検索バーで[キャンセル]をクリックすると、空の検索バーと元のテーブルのナビゲーションバーが表示されますビュー。コアデータから元のフィルタリングされていない配列は再ロードされません。私はストーリーボードの "ショーキャンセルボタン"をチェックしました。私は多くの記事と記事を調査しましたが、提案はありませんでした。コンソールメッセージは、キャンセルボタンが押された後、「フェッチ後のイベント：」と表示される他のメッセージの中で、2回実行されることを示しています。 "events ="、= "0、searchBarTextは空白のままです。self（自分自身の管理対象オブジェクト/イベントを含む） .events.count = 0

EventViewController.hファイル：

#import <UIKit/UIKit.h> 

    #import <Foundation/Foundation.h> 
    #import <CoreData/CoreData.h> 

    @interface EventViewController: UITableViewController  <UISearchResultsUpdating, UISearchControllerDelegate, UITableViewDataSource, UITableViewDelegate, UISearchBarDelegate> 


    { 
     IBOutlet UISearchBar *searchBar; 
    } 

     @end 

EventViewController.mファイル：

#import "EventViewController.h" 
#import <CoreData/CoreData.h> 
#import "EventDetailViewController.h" 

@interface EventViewController()  

@property (nonatomic, strong) NSMutableArray *events; 
@property (nonatomic, strong) UISearchController *searchController; 
@property(nonatomic, weak) id<UISearchResultsUpdating> searchResultsUpdater; 
@property (nonatomic,strong) UISearchBar *_searchBar; 
@property(nonatomic, assign) BOOL obscuresBackgroundDuringPresentation; 
@property(nonatomic, weak) id<UISearchControllerDelegate> delegate; 

//@property(nonatomic, assign, getter=isActive) BOOL active; 

@end 


@implementation EventViewController 
NSMutableArray *events; 


- (NSManagedObjectContext *)managedObjectContext { 

    NSLog(@"Setting up managed object context"); 

    NSManagedObjectContext *context = nil; 
    id delegate = [[UIApplication sharedApplication] delegate]; 
    if ([delegate performSelector:@selector(managedObjectContext)]) { 
     context = [delegate managedObjectContext]; 
    } 
    return context; 

} 



- (void)updateSearchResultsForSearchController:(UISearchController *)searchController 
{ 

    // Fetch the events from persistent data store 

    NSManagedObjectContext *managedObjectContext = [self managedObjectContext]; 
    NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] initWithEntityName:@"Event"]; 

    self.events = [[managedObjectContext executeFetchRequest:fetchRequest error:nil] mutableCopy]; 


     NSPredicate *resultPredicate = [NSPredicate predicateWithFormat:@"name contains[c] %@", self.searchController.searchBar.text]; 

    self.events = [[self.events filteredArrayUsingPredicate:resultPredicate] mutableCopy]; 


} 


- (BOOL)shouldReloadTableForSearchString:(UISearchController *)searchController 


{ 


    return YES; 

} 



- (void)viewDidLoad { 
    [super viewDidLoad]; 

    self.searchController = [[UISearchController alloc] initWithSearchResultsController:nil]; 
    self.searchController.searchResultsUpdater = self; 
    self.searchController.dimsBackgroundDuringPresentation = false; 
    self.tableView.tableHeaderView = self.searchController.searchBar; 
    self.definesPresentationContext = true; 
    self.searchController.searchBar.delegate = self; 
    self.searchController.delegate = self; 
    self.searchController.obscuresBackgroundDuringPresentation = NO; 

} 



- (void)searchBarSearchButtonClicked:(UISearchBar *)searchBar 
{ 

    [self.searchController.searchBar becomeFirstResponder]; 
} 




- (void)didReceiveMemoryWarning { 
    [super didReceiveMemoryWarning]; 
    // Dispose of any resources that can be recreated. 
} 



- (void)viewDidAppear:(BOOL)animated 
{ 
    [super viewDidAppear:animated]; 

    // Fetch the events from persistent data store 
    NSManagedObjectContext *managedObjectContext = [self managedObjectContext]; 
    NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] initWithEntityName:@"Event"]; 
    self.events = [[managedObjectContext executeFetchRequest:fetchRequest error:nil] mutableCopy]; 

    [self.tableView reloadData]; 
} 




- (void)searchBarCancelButtonClicked:(UISearchBar *)searchBar 
{ 

    self.searchController.searchBar.text = nil; 
    [self.searchController.searchBar resignFirstResponder]; 
    [self.tableView reloadData];  

    } 


#pragma mark - Table view data source 

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView { 


    return 1; 
} 



- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { 


    { 

     return [self.events count]; 
    } 
} 



- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath 
{ 


    static NSString *CellIdentifier = @"Cell"; 
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath]; 


    // Configure the cell... 
    NSManagedObject *event = [self.events objectAtIndex:indexPath.row]; 
    [cell.textLabel setText:[NSString stringWithFormat:@"%@", [event valueForKey:@"name"]]]; 

     { 

     event = [events objectAtIndex:indexPath.row]; 
     NSManagedObject *event = [self.events objectAtIndex:indexPath.row]; 
     [cell.textLabel setText:[NSString stringWithFormat:@"%@", [event valueForKey:@"name"]]]; 
    } 

    return cell; 

} 



// Override to support conditional editing of the table view. 
- (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath { 
    // Return NO if you do not want the specified item to be editable. 
    return YES; 
} 



// Override to support editing the table view. 

- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath 
{ 
    NSManagedObjectContext *context = [self managedObjectContext]; 

    if (editingStyle == UITableViewCellEditingStyleDelete) { 
     // Delete object from database 
     [context deleteObject:[self.events objectAtIndex:indexPath.row]]; 

     NSError *error = nil; 
     if (![context save:&error]) { 
      NSLog(@"Can't Delete! %@ %@", error, [error localizedDescription]); 
      return; 
     } 

     // Remove event from table view 
     [self.events removeObjectAtIndex:indexPath.row]; 
     [self.tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade]; 
    } 
} 


#pragma mark - Navigation 


// Get the new view controller using [segue destinationViewController]. 
// Pass the selected object to the new view controller. 

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)send 


{ 

    if ([[segue identifier] isEqualToString:@"UpdateEvent"]) { 
     NSManagedObject *selectedEvent = [self.events objectAtIndex:[[self.tableView indexPathForSelectedRow] row]]; 

     EventDetailViewController *destViewController = segue.destinationViewController; 
     destViewController.event = selectedEvent; 
    } 
} 

@end 

Answer 1

キャンセル機能を使用すると、配列をフィルタリングしないでください。このとき、以下の行を実行しないでください。長さを確認するには、self.searchController.searchBar.textをチェックするか、ブール値を設定してキャンセルをクリックするか、テキストフィールド

NSPredicate *resultPredicate = [NSPredicate predicateWithFormat:@"name contains[c] %@", self.searchController.searchBar.text]; 

    self.events = [[self.events filteredArrayUsingPredicate:resultPredicate] mutableCopy]; 

Answer 2

あなたsearchBarCancelButtonClickedではNO = self.searchController.activeを追加します。 reloadData

は、のviewDidLoad

で財産

@property (strong, nonatomic) UISearchController *searchController; 

を追加した.h

でUISearchBarDelegateを追加ストーリーボード

に任意の検索コントロールをドロップしない、コードで検索コントローラを作成する前に前に

self.searchController = [[UISearchController alloc] initWithSearchResultsController:nil]; 
self.searchController.searchResultsUpdater = self; 
self.searchController.dimsBackgroundDuringPresentation = NO; 
self.searchController.searchBar.delegate = self; 

self.tableView.tableHeaderView = self.searchController.searchBar; 
self.definesPresentationContext = YES; 
[self.searchController.searchBar sizeToFit];