ios - 添加一些数据后复选标记重复....当我进行检查时

Question

我有一个带有左侧检查按钮的表格 View 。对于前 6 个数据，它运行良好。当我向我的 TableView 添加三个数据之后，当我检查我的第一个数据时，我的 7 数据也得到检查。同样明智的是，当我检查一个数据时，其他一些数据也用复选标记重复..... 我正在使用核心数据....如果有人能回答这个......

  @interface ViewController ()
{

    NSDateFormatter *formatter;
}

@property (strong) NSMutableArray *notes;
@end

@implementation ViewController
@synthesize tableView;
@synthesize addButton;
@synthesize catefetchedResultsController;


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

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    self.navigationItem.title = @"My Notes";

    tableView.dataSource = self;
    tableView.delegate = self;
    [self.view addSubview:tableView];

    formatter = [[NSDateFormatter alloc] init];
    formatter.doesRelativeDateFormatting = YES;
    formatter.locale = [NSLocale currentLocale];
    formatter.dateStyle = NSDateFormatterShortStyle;
    formatter.timeStyle = NSDateFormatterNoStyle;

             CATransition *animation = [CATransition animation];
            [animation setDuration:2.0];
            [animation setType:kCATransitionPush];
        [animation setSubtype:kCATransitionFromTop];

        [animation setTimingFunction:[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionDefault]];

        [[addButton layer] addAnimation:animation forKey:@"SwitchToDown"];


}

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

    // Fetch the devices from persistent data store
    NSManagedObjectContext *managedObjectContext = [self managedObjectContext];
    NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] initWithEntityName:@"Notes"];

    NSError *error = nil;
    self.notes = [[managedObjectContext executeFetchRequest:fetchRequest error:&error] mutableCopy];

    NSSortDescriptor *titleSorter= [[NSSortDescriptor alloc] initWithKey:@"mod_time" ascending:NO];

    [self.notes sortUsingDescriptors:[NSArray arrayWithObject:titleSorter]]
    ;

    NSLog(@"Your Error - %@",error.description);

    [tableView reloadData];
}



#pragma mark - Table view data source

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    // Return the number of sections.
    return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    // Return the number of rows in the section.
    return self.notes.count;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"cell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];

    //UIButton *testButton;
    if (cell == nil) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier];


        UIButton *testButton = [[UIButton alloc]initWithFrame:CGRectMake(5, 5, 40, 40)];


        [testButton setImage:[UIImage imageNamed:@"oval"] forState:UIControlStateNormal];

        [testButton setImage:[UIImage imageNamed:@"tick"] forState:UIControlStateSelected];

        [testButton addTarget:self action:@selector(buttonTouched:) forControlEvents:UIControlEventTouchUpInside];

        [cell addSubview:testButton];
        [cell setIndentationLevel:1];
        [cell setIndentationWidth:45];





    cell.selectionStyle = UITableViewCellSelectionStyleNone;

    }


    // Configure the cell...
        NSManagedObject *note = [self.notes objectAtIndex:indexPath.row];

        NSDate *date = [note valueForKey:@"mod_time"];

        NSString *dateString = [formatter stringFromDate:date];


        cell.textLabel.text = [note valueForKey:@"title"];



        cell.detailTextLabel.text = dateString;




    return cell;

}

- (void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath
{
    //cell.textLabel.font = [UIFont fontNamesForFamilyName:@"Avenir"];
    cell.textLabel.font = [UIFont fontWithName:@"Avenir" size:19.0];


    cell.detailTextLabel.font=[UIFont fontWithName:@"Avenir" size:15.0];

}

-(void)buttonTouched:(id)sender




{

        UIButton *btn = (UIButton *)sender;

        if( [[btn imageForState:UIControlStateNormal] isEqual:[UIImage imageNamed:@"oval"]])
        {

            [btn setImage:[UIImage imageNamed:@"tick"] forState:UIControlStateNormal];

        }
        else
        {
            [btn setImage:[UIImage imageNamed:@"oval"] forState:UIControlStateNormal];
                    }
    }

-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {

    UITableViewCell *cell = (UITableViewCell *)[tableView cellForRowAtIndexPath:indexPath];

        [tableView deselectRowAtIndexPath:indexPath animated:YES];


}
- (IBAction)addButtonPressed:(id)sender {
    AddNoteViewController *addNoteVC = [AddNoteViewController new];

    // to remove unused warning....
#pragma unused (addNoteVC)

}

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

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

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

        // Remove device from table view
        [self.notes removeObjectAtIndex:indexPath.row];
        [tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];
    }
}
- (IBAction)btnClick:(id)sender {
}
@end

Answer 1

好吧，我看到了你的代码，是的，问题是可重用性，只需更改它，它就会解决你的问题

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = @"cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];

//UIButton *testButton;

    cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier];


    UIButton *testButton = [[UIButton alloc]initWithFrame:CGRectMake(5, 5, 40, 40)];


    [testButton setImage:[UIImage imageNamed:@"oval"] forState:UIControlStateNormal];

    [testButton setImage:[UIImage imageNamed:@"tick"] forState:UIControlStateSelected];

    [testButton addTarget:self action:@selector(buttonTouched:) forControlEvents:UIControlEventTouchUpInside];

    [cell addSubview:testButton];
    [cell setIndentationLevel:1];
    [cell setIndentationWidth:45];





cell.selectionStyle = UITableViewCellSelectionStyleNone;




// Configure the cell...
    NSManagedObject *note = [self.notes objectAtIndex:indexPath.row];

    NSDate *date = [note valueForKey:@"mod_time"];

    NSString *dateString = [formatter stringFromDate:date];


    cell.textLabel.text = [note valueForKey:@"title"];



    cell.detailTextLabel.text = dateString;




return cell;

}