My code appears to run just fine but when I swipe to delete a line within my UITableView, the app crashes with the following:

我的代码似乎运行得很好，但是当我滑动以删除 UITableView 中的一行时，应用程序崩溃并显示以下内容：

Error

错误

LittleToDoApp[70390:4116002] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Invalid update: invalid number of rows in section 0. The number of rows contained in an existing section after the update (1) must be equal to the number of rows contained in that section before the update (1), plus or minus the number of rows inserted or deleted from that section (0 inserted, 1 deleted) and plus or minus the number of rows moved into or out of that section (0 moved in, 0 moved out).'

LittleToDoApp[70390:4116002] *** 由于未捕获的异常“NSInternalInconsistencyException”而终止应用程序，原因：“无效更新：第 0 节中的行数无效。更新后现有节中包含的行数 (1) 必须为等于更新前该部分中包含的行数 (1)，加上或减去从该部分插入或删除的行数（0 插入，1 删除），加上或减去移入或移出的行数那个部分（0 移入，0 移出）。

ViewController.m

视图控制器.m

#import "ViewController.h"
#import "ToDoItem.h"
#import "ToDoItemSvcCache.h"

@interface ViewController ()

@end

@implementation ViewController

@synthesize tableView;

ToDoItemSvcCache *ToDoItemSvc = nil;

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.

    ToDoItemSvc = [[ToDoItemSvcCache alloc] init];
}



- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (IBAction)deleteToDoItem:(id)sender {
    NSLog(@"Deleting ToDoItem");

    [self.view endEditing:YES];

}

- (IBAction)addToDoItem:(id)sender {

    [self.view endEditing:YES];

    NSLog(@"saveToDoItem: entering");
    ToDoItem *todoitem = [[ToDoItem alloc] init];
    todoitem.todoitem = _toDoItem.text;
    [ToDoItemSvc createToDoItem:todoitem];

    [self.tableView reloadData];
    NSLog(@"saveToDoItem: todoitem saved");

}


- (UITableViewCell *)tableView:(UITableView *)tableView
         cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    static NSString *simpleTableIdentifier = @"toDoItemCell";
    UITableViewCell *cell =
    [tableView dequeueReusableCellWithIdentifier:simpleTableIdentifier];
    if (cell == nil) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault
                                  reuseIdentifier:simpleTableIdentifier];
    }
    ToDoItem *toDoItem = [[ToDoItemSvc retrieveAllToDoItems]
                    objectAtIndex:indexPath.row];
    cell.textLabel.text = [toDoItem description];
    return cell;
}



- (NSInteger)tableView:(UITableView *)tableView
 numberOfRowsInSection:(NSInteger)section
{
    return [[ToDoItemSvc retrieveAllToDoItems] count];
}

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    return 1;
}



- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    if ([segue.identifier isEqualToString:@"viewToDoItem"]) {
        NSIndexPath *indexPath = [self.tableView indexPathForSelectedRow];
        SecondViewController *destViewController = segue.destinationViewController;
        UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
        destViewController.toDoItemName = cell.textLabel.text;
    }
}

#pragma hiding status bar

- (BOOL)prefersStatusBarHidden {
    return YES;
}

// here we get back from both styles
- (IBAction)unwindFromDetailViewController:(UIStoryboardSegue *)segue
{
    // UIViewController *detailViewController = [segue sourceViewController];
    NSLog(@"%@", segue.identifier);
}

//Allows the delete button to show up when left swipping a list item

- (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath
{
    // Return YES - we will be able to delete all rows
    return YES;
}

- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath
{
    // Will add code to actually delete a row here. Adding NSLog so we know its triggering though
    NSLog(@"Deleted row.");

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

    [self.tableView reloadData];

}

@end

ToDoItemSvc.h

ToDoItemSvc.h

#import <Foundation/Foundation.h>
#import "ToDoItem.h"

@protocol ToDoItemSvc <NSObject>

    - (ToDoItem *) createToDoItem: (ToDoItem *) todoitem;
    - (NSMutableArray *) retrieveAllToDoItems;
    - (ToDoItem *) updateToDoItem: (ToDoItem *) todoitem;
    - (ToDoItem *) deleteToDoItem: (ToDoItem *) todoitem;

@end

Full source

完整来源

https://github.com/martylavender/LittleToDoApp/tree/Storyboards

https://github.com/martylavender/LittleToDoApp/tree/Storyboards

Edit

编辑

Following up after the comment/s made by Fennelouski, should I have something along these lines?

在 Fennelouski 发表评论后跟进，我应该有一些类似的东西吗？

- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {

    if (editingStyle == UITableViewCellEditingStyleDelete) {
        [self.toDoItem removeObjectAtIndex:indexPath.row];

        [tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationLeft];
        [self.tableView reloadData];

    }
}

Edit 2

编辑 2

This is what I am getting:

这就是我得到的：

https://www.evernote.com/l/AJiah58lVhdGXIYO1F5yv6fJXc7k3WjRLNYB/image.png

https://www.evernote.com/l/AJiah58lVhdGXIYO1F5yv6fJXc7k3WjRLNYB/image.png