带有tableview和搜索功能的iOS App
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【中文标题】带有tableview和搜索功能的iOS App【英文标题】：iOS App with tableview and search function 【发布时间】：2013-11-23 01:59:33 【问题描述】：我正在编写一个 ios 应用程序（来自 iOS 教程的更新应用程序）。它有一个带有 UITableView 和 UISearchBar 的视图（感谢 Ayan 和 Tommy）。我现在的问题是，该表显示来自核心数据实体的所有记录，当我点击一个单元格时，该应用程序会显示来自所选单元格的详细视图。这很好用。问题是使用搜索方法后，如果我点击搜索结果单元格，应用程序不会显示所选单元格的详细视图。我想我必须在任何地方确定搜索记录的发件人，但不知道如何或在哪里包括这个。 这是我目前的代码，欢迎任何帮助或提示...谢谢
#import "PersonsTVC.h"
#import "Person.h"
@implementation PersonsTVC
@synthesize fetchedResultsController = __fetchedResultsController;
@synthesize managedObjectContext = __managedObjectContext;
@synthesize selectedPerson;
@synthesize searchResults;
- (void)setupFetchedResultsController
NSString *entityName = @"Person";
NSLog(@"Setting up a Fetched Results Controller for the Entity named %@", entityName);
NSFetchRequest *request = [NSFetchRequest fetchRequestWithEntityName:entityName];
request.sortDescriptors = [NSArray arrayWithObject:[NSSortDescriptor sortDescriptorWithKey:@"firstname"
ascending:YES
selector:@selector(localizedCaseInsensitiveCompare:)]];
self.fetchedResultsController = [[NSFetchedResultsController alloc] initWithFetchRequest:request
managedObjectContext:self.managedObjectContext
sectionNameKeyPath:nil
cacheName:nil];
[self performFetch];
- (void) viewDidLoad
self.searchResults = [NSMutableArray arrayWithCapacity:[[self.fetchedResultsController fetchedObjects] count]];
[self.tableView reloadData];
-(void) viewDidUnload
self.searchResults = nil;
- (void)viewWillAppear:(BOOL)animated
[super viewWillAppear:animated];
[self setupFetchedResultsController];
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
static NSString *CellIdentifier = @"Persons Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil)
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
// Configure the cell...
// Configure the cell...
Person *person = nil;
if (tableView == self.searchDisplayController.searchResultsTableView)
NSLog(@"Configuring cell to show search results");
person = [self.searchResults objectAtIndex:indexPath.row];
else
NSLog(@"Configuring cell to show normal data");
person = [self.fetchedResultsController objectAtIndexPath:indexPath];
NSString *fullname = [NSString stringWithFormat:@"%@ %@", person.firstname, person.surname];
cell.textLabel.text = person.firstname;
if ([person.inRole.color isEqual :@"Yellow"])
cell.imageView.image = [UIImage imageNamed:@"Yellow"];
if ([person.inRole.color isEqual :@"Black"])
cell.imageView.image = [UIImage imageNamed:@"Black"];
if ([person.inRole.color isEqual :@"Grey"])
cell.imageView.image = [UIImage imageNamed:@"Grey"];
if ([person.inRole.color isEqual :@"Red"])
cell.imageView.image = [UIImage imageNamed:@"Red"];
if ([person.inRole.color isEqual :@"Blue"])
cell.imageView.image = [UIImage imageNamed:@"Blue"];
if ([person.inRole.color isEqual :@"Dark Green"])
cell.imageView.image = [UIImage imageNamed:@"DarkGreen"];
if ([person.inRole.color isEqual :@"Light Green"])
cell.imageView.image = [UIImage imageNamed:@"LightGreen"];
if ([person.inRole.color isEqual :@"Light Blue"])
cell.imageView.image = [UIImage imageNamed:@"LightBlue"];
if ([person.inRole.color isEqual :@"Brown"])
cell.imageView.image = [UIImage imageNamed:@"Brown"];
if ([person.inRole.color isEqual :@"Dark Orange"])
cell.imageView.image = [UIImage imageNamed:@"DarkOrange"];
cell.detailTextLabel.text = person.surname;
//cell.textLabel.text = person.firstname;
return cell;
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
if (tableView == self.searchDisplayController.searchResultsTableView)
return [self.searchResults count];
else
return [[[self.fetchedResultsController sections] objectAtIndex:section] numberOfObjects];
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath
if (editingStyle == UITableViewCellEditingStyleDelete)
[self.tableView beginUpdates]; // Avoid NSInternalInconsistencyException
// Delete the person object that was swiped
Person *personToDelete = [self.fetchedResultsController objectAtIndexPath:indexPath];
NSLog(@"Deleting (%@)", personToDelete.firstname);
[self.managedObjectContext deleteObject:personToDelete];
[self.managedObjectContext save:nil];
// Delete the (now empty) row on the table
[self.tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];
[self performFetch];
[self.tableView endUpdates];
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
if ([segue.identifier isEqualToString:@"Add Person Segue"])
NSLog(@"Setting PersonsTVC as a delegate of PersonDetailTVC");
PersonDetailTVC *personDetailTVC = segue.destinationViewController;
personDetailTVC.delegate = self;
NSLog(@"Creating a new person and passing it to PersonDetailTVC");
Person *newPerson = [NSEntityDescription insertNewObjectForEntityForName:@"Person"
inManagedObjectContext:self.managedObjectContext];
personDetailTVC.person = newPerson;
else if ([segue.identifier isEqualToString:@"Person Detail Segue"])
NSLog(@"Setting PersonsTVC as a delegate of PersonDetailTVC");
PersonDetailTVC *personDetailTVC = segue.destinationViewController;
personDetailTVC.delegate = self;
// Store selected Person in selectedPerson property
NSIndexPath *indexPath = [self.tableView indexPathForSelectedRow];
self.selectedPerson = [self.fetchedResultsController objectAtIndexPath:indexPath];
NSLog(@"Passing selected person (%@) to PersonDetailTVC", self.selectedPerson.firstname);
personDetailTVC.person = self.selectedPerson;
else
NSLog(@"Unidentified Segue Attempted!");
- (void)theSaveButtonOnThePersonDetailTVCWasTapped:(PersonDetailTVC *)controller
// do something here like refreshing the table or whatever
// close the delegated view
[controller.navigationController popViewControllerAnimated:YES];
#pragma mark -
#pragma mark Content Filtering
-(void)filterContentForSearchText:(NSString*)searchText scope:(NSString*)scope
self.searchResults = [[self.fetchedResultsController fetchedObjects] filteredArrayUsingPredicate:[NSPredicate predicateWithBlock:^BOOL(id evaluatedObject, NSDictionary *bindings)
Person* person = evaluatedObject;
NSString* firstName = person.firstname;
//searchText having length < 3 should not be considered
if (!!searchText && [searchText length] < 3)
return YES;
if ([scope isEqualToString:@"All"] || [firstName isEqualToString:scope])
return ([firstName rangeOfString:searchText].location != NSNotFound);
return NO; //if nothing matches
]];
#pragma mark -
#pragma mark UISearchDisplayController Delegate Methods
- (BOOL)searchDisplayController:(UISearchDisplayController *)controller shouldReloadTableForSearchString:(NSString *)searchString
[self filterContentForSearchText:searchString scope:@"All"];
return YES;
- (BOOL)searchDisplayController:(UISearchDisplayController *)controller shouldReloadTableForSearchScope:(NSInteger)searchOption
[self filterContentForSearchText:[self.searchDisplayController.searchBar text] scope:@"All"];
return YES;
@end
【问题讨论】：
请关注tutorial，特别是“将数据发送到详细视图”部分。但是，在发布此类查询之前，请确保您已经进行了足够的研究，否则只会增加网站负担，您的问题将被否决并依次删除。 我看过推荐的教程，但是我没有找到解决我的问题的方法，我看到在推荐的教程中有两个表格视图，而在我的应用程序中只有一个和两个不同的数组，一个用于包含所有记录的普通视图，一个用于过滤记录。对不起，我需要一点帮助... 好的，你的想法。我的建议是始终使用过滤后的结果集作为表的数据源。过滤后的结果集将根据您可能已经弄清楚的搜索过滤器进行过滤。然后在您的cellForRowAtIndexPath 方法中删除检查if (tableView == self.searchDisplayController.searchResultsTableView) 并始终使用person = [self.searchResults objectAtIndex:indexPath.row];。
谢谢 Ayan，但您的建议无效。无论如何谢谢你。你对我很好……
【参考方案1】：
我猜您的故事板中有一个 segue 设置（您可以在其中按住 Control 单击从表格单元格拖动到详细视图控制器），允许触摸常规表格视图单元格以转到详细信息视图，但是您的搜索表格视图单元格没有明确说明触摸时的操作。
尝试添加表格视图委托方法 didSelectRowAtIndexPath 并在触摸搜索表格单元格时启动 segue：
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
// Perform segue to detail when a SEARCH table cell is touched
if(tableView == self.searchDisplayController.searchResultsTableView)
[self performSegueWithIdentifier:@"Person Detail Segue" sender:tableView];
这样做应该会在触摸搜索结果表格单元格时触发您的 prepareForSegue 方法。看来您已经实现了处理“Person Detail Segue”的逻辑，但我们需要添加逻辑来区分 segue 是来自选定的常规表格单元格还是来自搜索表格单元格。
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
if ([segue.identifier isEqualToString:@"Add Person Segue"])
NSLog(@"Setting PersonsTVC as a delegate of PersonDetailTVC");
PersonDetailTVC *personDetailTVC = segue.destinationViewController;
personDetailTVC.delegate = self;
NSLog(@"Creating a new person and passing it to PersonDetailTVC");
Person *newPerson = [NSEntityDescription insertNewObjectForEntityForName:@"Person"
inManagedObjectContext:self.managedObjectContext];
personDetailTVC.person = newPerson;
else if ([segue.identifier isEqualToString:@"Person Detail Segue"])
NSLog(@"Setting PersonsTVC as a delegate of PersonDetailTVC");
PersonDetailTVC *personDetailTVC = segue.destinationViewController;
personDetailTVC.delegate = self;
// Store selected Person in selectedPerson property
if(sender == self.searchDisplayController.searchResultsTableView)
NSIndexPath *indexPath = [self.searchDisplayController.searchResultsTableView indexPathForSelectedRow];
self.selectedPerson = [self.searchResults objectAtIndex:[indexPath row]];
else
NSIndexPath *indexPath = [self.tableView indexPathForSelectedRow];
self.selectedPerson = [self.fetchedResultsController objectAtIndexPath:indexPath];
NSLog(@"Passing selected person (%@) to PersonDetailTVC", self.selectedPerson.firstname);
personDetailTVC.person = self.selectedPerson;
else
NSLog(@"Unidentified Segue Attempted!");
我可能存在一些实施错误，但我相信这是对您有用的一般策略。我希望这会有所帮助。
【讨论】：
谢谢 Mfarmer，您的解决方案运行良好，非常好的解决方案。我从你的代码中学到了很多东西。以上是关于带有tableview和搜索功能的iOS App的主要内容，如果未能解决你的问题，请参考以下文章
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