ios – 通过Apple的ToDoList应用程序教程,项目点击不会正确添加“已完成”复选标记.

当我点击一个项目时,它似乎没有注册并在右侧添加一个复选标记.当我点击后续项目时,它会在我之前点击的那个旁边显示一个复选标记,但不会显示我刚刚点击的那个,依此类推,始终保留一个动作.

XYZToDoListViewController.m：

//
//  XYZToDoListViewController.m
//  ToDoList
//
//  Created by Andrew Ghobrial on 2/15/14.
//
//

#import "XYZToDoListViewController.h"
#import "XYZToDoItem.h"

@interface XYZToDoListViewController ()

@property NSMutableArray *toDoItems;

@end

@implementation XYZToDoListViewController

- (void)loadInitialData {
    XYZToDoItem *item1 = [[XYZToDoItem alloc] init];
    item1.itemname = @"Buy milk";
    [self.toDoItems addObject:item1];
    XYZToDoItem *item2 = [[XYZToDoItem alloc] init];
    item2.itemname = @"Buy eggs";
    [self.toDoItems addObject:item2];
    XYZToDoItem *item3 = [[XYZToDoItem alloc] init];
    item3.itemname = @"Read a book";
    [self.toDoItems addObject:item3];
}

 - (IBACtion)unwindToList:(UIStoryboardSegue *)segue
{



}

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

- (void)viewDidLoad
{
    [super viewDidLoad];

    self.toDoItems = [[NSMutableArray alloc] init];

    [self loadInitialData];

    // 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;
}

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

#pragma mark - Table view data source

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

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{

    // Return the number of rows in the section.
    return [self.toDoItems count];
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowATindexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"ListPrototypeCell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
    XYZToDoItem *toDoItem = [self.toDoItems objectATindex:indexPath.row];
    cell.textLabel.text = toDoItem.itemname;
    if (toDoItem.completed) {
        cell.accessoryType = UITableViewCellAccessorycheckmark;
    } else {
        cell.accessoryType = UITableViewCellAccessoryNone;
    }
    return cell;
}

/*
// 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
        [tableView deleteRowsATindexPaths:@[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 - Navigation

// In a story board-based application,you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    // Get the new view controller using [segue desTinationViewController].
    // Pass the SELEcted object to the new view controller.
}

 */



#pragma mark - Table view delegate

- (void)tableView:(UITableView *)tableView didDeSELEctRowATindexPath:(NSIndexPath *)indexPath
{
    [tableView deSELEctRowATindexPath:indexPath animated:NO];
    XYZToDoItem *tappedItem = [self.toDoItems objectATindex:indexPath.row];
    tappedItem.completed = !tappedItem.completed;
    [tableView reloadRowsATindexPaths:@[indexPath]withRowAnimation:UITableViewRowAnimationNone];
}



@end

- (void)tableView:(UITableView *)tableView didDeSELEctRowATindexPath:(NSIndexPath *)indexPath

- (void)tableView:(UITableView *)tableView didSELEctRowATindexPath:(NSIndexPath *)indexPath