单元格不显示在SearchBar -Core数据中

我对Xcode相当陌生，并且在search栏中显示表视图数据的时候遇到困难。 基本上试图将获取的结果返回到search栏。 提前致谢！

#import "DeviceViewController.h" #import "DeviceDetailViewController.h" @interface DeviceViewController () @property (strong) NSMutableArray *devices; @end @implementation DeviceViewController { NSArray *recipes; NSArray *searchResults; } @synthesize recipe; - (NSManagedObjectContext *)managedObjectContext { NSManagedObjectContext *context = nil; id delegate = [[UIApplication sharedApplication] delegate]; if ([delegate performSelector:@selector(managedObjectContext)]) { context = [delegate managedObjectContext]; } return context; } - (id)initWithStyle:(UITableViewStyle)style { self = [super initWithStyle:style]; if (self) { } return self; } - (void)viewDidLoad { [super viewDidLoad]; UILabel *label = [[UILabel alloc] initWithFrame:CGRectZero]; //label.backgroundColor = [UIColor clearColor]; label.font = [UIFont fontWithName:@"HelveticaNeue-thin" size:28]; //label.shadowColor = [UIColor colorWithWhite:0.0 alpha:0.5]; label.textColor = [UIColor blackColor]; self.navigationItem.titleView = label; label.text = @"TapNotes"; [label sizeToFit]; } - (void)viewDidAppear:(BOOL)animated { [super viewDidAppear:animated]; // Fetch the devices from persistent data store NSManagedObjectContext *managedObjectContext = [self managedObjectContext]; NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] initWithEntityName:@"Device"]; self.devices = [[managedObjectContext executeFetchRequest:fetchRequest error:nil] mutableCopy]; [self.tableView reloadData]; } - (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated. } #pragma mark - Table view data source - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView { // Return the number of sections. return 1; } - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { if (tableView == self.searchDisplayController.searchResultsTableView) { return [searchResults count]; } else { return self.devices.count; } //return self.devices.count; } - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { static NSString *CellIdentifier = @"Cell"; UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier]; if (cell==nil) { cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier]; } NSManagedObject *device = [self.devices objectAtIndex:indexPath.row]; [cell.textLabel setText:[NSString stringWithFormat:@"%@", [device valueForKey:@"name"]]]; [cell.detailTextLabel setText:[NSString stringWithFormat:@"%@",[device valueForKey:@"version"]]]; if (tableView == self.searchDisplayController.searchResultsTableView) { recipe = [searchResults objectAtIndex:indexPath.row]; } else { [self.devices objectAtIndex:indexPath.row]; } // cell.thumbnailImageView.image = [UIImage imageNamed:recipe.image]; return cell; } - (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath { // Return NO if you do not want the specified item to be editable. return YES; } - (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath { NSManagedObjectContext *context = [self managedObjectContext]; if (editingStyle == UITableViewCellEditingStyleDelete) { // Delete object from database [context deleteObject:[self.devices objectAtIndex:indexPath.row]]; NSError *error = nil; if (![context save:&error]) { NSLog(@"Can't Delete! %@ %@", error, [error localizedDescription]); return; } // Remove device from table view [self.devices removeObjectAtIndex:indexPath.row]; [self.tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade]; } } /* // Override to support editing the table view. - (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath { if (editingStyle == UITableViewCellEditingStyleDelete) { // Delete the row from the data source [tableView deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationFade]; } else if (editingStyle == UITableViewCellEditingStyleInsert) { // Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view } } */ /* // Override to support rearranging the table view. - (void)tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)fromIndexPath toIndexPath:(NSIndexPath *)toIndexPath { } */ /* // Override to support conditional rearranging of the table view. - (BOOL)tableView:(UITableView *)tableView canMoveRowAtIndexPath:(NSIndexPath *)indexPath { // Return NO if you do not want the item to be re-orderable. return YES; } */ - (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender { if ([[segue identifier] isEqualToString:@"UpdateDevice"]) { NSManagedObject *selectedDevice = [self.devices objectAtIndex:[[self.tableView indexPathForSelectedRow] row]]; DeviceDetailViewController *destViewController = segue.destinationViewController; destViewController.device = selectedDevice; } } - (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath { return 55; } - (void)filterContentForSearchText:(NSString*)searchText scope:(NSString*)scope { NSPredicate *resultPredicate = [NSPredicate predicateWithFormat:@"name contains[c] %@", searchText]; searchResults = [recipes filteredArrayUsingPredicate:resultPredicate]; } -(BOOL)searchDisplayController:(UISearchDisplayController *)controller shouldReloadTableForSearchString:(NSString *)searchString { [self filterContentForSearchText:searchString scope:[[self.searchDisplayController.searchBar scopeButtonTitles] objectAtIndex:[self.searchDisplayController.searchBar selectedScopeButtonIndex]]]; return YES; } @end 

Answer 1

事情并不在这里。

1. 你为什么不使用NSFetchedResultsConteroller ？
2. recipes和devicesarrays之间的连接是什么？
3. 你没有设置食谱数组 （你在filterContentForSearchText:上过滤filterContentForSearchText:
4. 你的cellForRowAtIndexPath:总是为devices数组设置单元格的数据
5. 你有很多“死”的代码

它看起来像你从一个例子中获得这个代码，并修改它，但只有一半。