SIGABRTからテーブルビューの行を削除する

Question

テーブルビューのリストに配列に格納されているオブジェクトの数を確認しようとしていますが、行を削除しようとするとき以外はうまくいきます。 SIGABRT。私はそれが正しくアレイを更新していることを確認しました。 SIGABRTはテーブルのセクション数と関係があるようです。

CalendarViewController.h

#import <UIKit/UIKit.h> 
#import "Job.h" 
#import "Shift.h" 
#import "AppDelegate.h" 

@interface CalendarViewController : UITableViewController 

@property (nonatomic, strong) NSMutableArray *currentShiftsList; 
@property (nonatomic, strong) AppDelegate *dataCenter; 

@end 

CalendarViewController.m

#import "CalendarViewController.h" 

@interface CalendarViewController() 

@property (nonatomic, strong) NSMutableDictionary *sections; 
@property (nonatomic, strong) NSArray *sortedShifts; 
@property (strong, nonatomic) NSDateFormatter *sectionDateFormatter; 
@property (strong, nonatomic) NSDateFormatter *cellDateFormatter; 

@end 

@implementation CalendarViewController 

@synthesize sections, sortedShifts, currentShiftsList, dataCenter, sectionDateFormatter, cellDateFormatter; 

- (id)initWithStyle:(UITableViewStyle)style 
{ 
    self = [super initWithStyle:style]; 
    if (self) { 
     // Custom initialization 
    } 
    return self; 
} 

- (NSDate *)dateAtBeginningOfDayForDate:(NSDate *)inputDate { 

    // Use the user's current calendar and time zone 
    NSCalendar *calendar = [NSCalendar currentCalendar]; 
    NSTimeZone *timeZone = [NSTimeZone systemTimeZone]; 
    [calendar setTimeZone:timeZone]; 

    // Selectively convert the date components (year, month, day) of the input date 
    NSDateComponents *dateComps = [calendar components:NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit fromDate:inputDate]; 

    // Set the time components manually 
    [dateComps setHour:0]; 
    [dateComps setMinute:0]; 
    [dateComps setSecond:0]; 

    // Convert back  
    NSDate *beginningOfDay = [calendar dateFromComponents:dateComps]; 
    return beginningOfDay; 
} 

- (NSDate *)dateByAddingYears:(NSInteger)numberOfYears toDate:(NSDate *)inputDate 
{ 
    // Use the user's current calendar 
    NSCalendar *calendar = [NSCalendar currentCalendar]; 

    NSDateComponents *dateComps = [[NSDateComponents alloc] init]; 
    [dateComps setYear:numberOfYears]; 

    NSDate *newDate = [calendar dateByAddingComponents:dateComps toDate:inputDate options:0]; 
    return newDate; 
} 

- (void)viewDidLoad 
{ 
    [super viewDidLoad]; 

    dataCenter = (AppDelegate *)[[UIApplication sharedApplication] delegate]; 
    currentShiftsList = [[NSMutableArray alloc] initWithArray:dataCenter.shiftsList]; 

    self.sectionDateFormatter = [[NSDateFormatter alloc] init]; 
    [self.sectionDateFormatter setDateStyle:NSDateFormatterLongStyle]; 
    [self.sectionDateFormatter setTimeStyle:NSDateFormatterNoStyle]; 

    self.cellDateFormatter = [[NSDateFormatter alloc] init]; 
    [self.cellDateFormatter setDateStyle:NSDateFormatterNoStyle]; 
    [self.cellDateFormatter setTimeStyle:NSDateFormatterShortStyle]; 

    // Uncomment the following line to preserve selection between presentations. 
    // self.clearsSelectionOnViewWillAppear = NO; 

    // Uncomment the following line to display an Edit button in the navigation bar for this view controller. 
    self.navigationItem.rightBarButtonItem = self.editButtonItem; 

    self.sections = [NSMutableDictionary dictionary]; 
    for (Shift *shift in dataCenter.shiftsList) { 

     // Reduce event start date to date components (year, month, day) 
     NSDate *dateRepresentingThisDay = [self dateAtBeginningOfDayForDate:shift.startDate]; 

     // If we don't yet have an array to hold the events for this day, create one 
     NSMutableArray *shiftsOnThisDay = [self.sections objectForKey:dateRepresentingThisDay]; 
     if (shiftsOnThisDay == nil) { 
      shiftsOnThisDay = [NSMutableArray array]; 

      // Use the reduced date as dictionary key to later retrieve the event list this day 
      [self.sections setObject:shiftsOnThisDay forKey:dateRepresentingThisDay]; 
     } 

     // Add the event to the list for this day 
     [shiftsOnThisDay addObject:shift]; 
    } 

    // Create a sorted list of days 
    NSArray *unsortedShifts = [self.sections allKeys]; 
    self.sortedShifts = [unsortedShifts sortedArrayUsingSelector:@selector(compare:)]; 
} 



- (void)viewDidUnload 
{ 
    [super viewDidUnload]; 
    // Release any retained subviews of the main view. 
    // e.g. self.myOutlet = nil; 
} 

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation 
{ 
    return (interfaceOrientation == UIInterfaceOrientationPortrait); 
} 

#pragma mark - Table view data source 

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView 
{ 
    // Return the number of sections. 
    return [self.sections count]; 
} 

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section 
{ 
    // Return the number of rows in the section. 
    NSDate *dateRepresentingThisDay = [self.sortedShifts objectAtIndex:section]; 
    NSArray *eventsOnThisDay = [self.sections objectForKey:dateRepresentingThisDay]; 
    return [eventsOnThisDay count]; 
} 

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

    NSDate *dateRepresentingThisDay = [self.sortedShifts objectAtIndex:indexPath.section]; 
    NSArray *eventsOnThisDay = [self.sections objectForKey:dateRepresentingThisDay]; 
    Shift *shift = [eventsOnThisDay objectAtIndex:indexPath.row]; 

    cell.textLabel.text = shift.jobtitle; 

    NSDateFormatter *formatter = [[NSDateFormatter alloc] init]; 
    [formatter setDateFormat:@"h:mm a"]; 

    NSString *start = [formatter stringFromDate:shift.startDate]; 
    NSString *end = [formatter stringFromDate:shift.endDate]; 

    NSString *detail = [[NSString alloc] initWithFormat:@"%@ to %@", start, end]; 
    cell.detailTextLabel.text = detail; 
    return cell; 
} 

- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section 
{ 
    NSDate *dateRepresentingThisDay = [self.sortedShifts objectAtIndex:section]; 
    return [self.sectionDateFormatter stringFromDate:dateRepresentingThisDay]; 
} 

/* 
// 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 
{ 
    if (editingStyle == UITableViewCellEditingStyleDelete) { 
     // Delete the row from the data source 

     [currentShiftsList removeObjectAtIndex:indexPath.row]; 
     dataCenter.shiftsList = currentShiftsList; 

     [tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject: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; 
} 
*/ 

#pragma mark - Table view delegate 

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath 
{ 
    // Navigation logic may go here. Create and push another view controller. 
    /* 
    <#DetailViewController#> *detailViewController = [[<#DetailViewController#> alloc] initWithNibName:@"<#Nib name#>" bundle:nil]; 
    // ... 
    // Pass the selected object to the new view controller. 
    [self.navigationController pushViewController:detailViewController animated:YES]; 
    */ 
} 

@end 

Answer 1

これは私には意味がありません。ここではテーブルビューコントローラのためのコードです。

[tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade]; 

なぜそれだけではありません。

[tableView deleteRowsAtIndexPaths:indexPath.row withRowAnimation:UITableViewRowAnimationFade]; 

また、（あなたがそれをしたい場合）を削除した後、リロードテーブルビューを覚えています。

Answer 2

行を削除すると、currentShiftsList配列から項目が削除されます。しかし、その配列をUITableViewDataSource関連のメソッドで使用していません。 TableViewはDataSourceからアイテムが1つ少なくなることを期待していますが、代わりに元のアイテム数が返されます。

全体的に、同じデータセット（またはそのデータのコピー）を管理しようとするコレクションがいくつかあるため、全体的には非常に混乱します。 CoreDataとNSFetchedResultsControllerを調べてください。NSFetchedResultsControllerは、データセットを管理し、変更をUITableViewに伝播するために作成されています。