我试图让一个表格视图列出许多存储在数组中的对象，并且它工作正常，而不是当我尝试删除一行时，它会抛出一个 SIGABRT。我检查了它是否正确更新了数组。SIGABRT 似乎与表中的节数有关。这是表格视图控制器的代码：
日历视图控制器.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
日历视图控制器.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