Question

我是xCode的新手，在解决这个错误的问题时遇到了问题：

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[CharacterObject copyWithZone:]: unrecognized selector sent to instance 0x92606b0'

编译时没有报告错误。错误是＆＃34; SIGABIT＆＃34;并出现在这一行：

cell.textLabel.text = (NSString *)[[mysections objectAtIndex:indexPath.section] objectAtIndex:indexPath.row];

这是我的代码。＆＃34; CharacterObject＆＃34;是NSObject文件。

@interface CharacterTableViewController ()
{
    NSMutableArray *mycharacterArray;
    NSMutableArray *myguestArray;
    NSString *mainCharacters;
    NSString *guestCharacters;
}


    - (void)viewDidLoad
{

    [super viewDidLoad];
    mysections =[[NSArray alloc]init];
    mycharacterArray = [[NSMutableArray alloc]init];
    myguestArray = [[NSMutableArray alloc]init];
    CharacterObject *myobject = [[CharacterObject alloc]init];
    guestObject *myguests = [[guestObject alloc]init];
    myheaders = [[NSArray alloc]initWithObjects:@"Main Characters", @"Guest Characters", nil];

    mysections = [NSArray arrayWithObjects:mycharacterArray, myguestArray, nil];

    myobject.charName = @"Joe Bloggs";
    myobject.charPic = @"RB";
    myobject.charNotes = @"Hello World";
    [mycharacterArray addObject:myobject];

    myguests = [[guestObject alloc]init];
    myguests.charName = @"Jonny Boy";
    myguests.charPic = @"JB";
    myguests.charNotes = @"Jonny Boy was here";
    [myguestArray addObject:myguests];

    mysections = [NSArray arrayWithObjects:mycharacterArray, myguestArray, nil];
}

    #pragma mark - Table view data source

    - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    return [mysections count];
}

    - (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section
{
    return [myheaders objectAtIndex:section];
}


    - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    // Return the number of rows in the section.
    return [[mysections objectAtIndex:section]count];
}

    - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"mycell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil)
    {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
    }
    // Configure the cell...
    cell.textLabel.text = (NSString *)[[mysections objectAtIndex:indexPath.section] objectAtIndex:indexPath.row];
    return cell;
}

    @end

提前感谢您的帮助。有任何问题请告诉我，我会尝试回答。

Phil W。

Answer 1

该错误意味着您的类对象＆＃34; CharacterObject＆＃34;接到方法的调用＆＃34; copyWithZone＆＃34;并且它没有实现该方法。

当调用方法- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath时，它会尝试填充单元格，并在包含以下内容的行中填充：

cell.textLabel.text = (NSString *)[[mysections objectAtIndex:indexPath.section] objectAtIndex:indexPath.row];

您正在尝试将CharacterObject强制转换为NSString（即第一次运行cellForRowAtIndexPath时，它使用indexPath（第0部分，第0行） - 这反过来意味着在行中：

cell.textLabel.text = (NSString *)[[mysections objectAtIndex:indexPath.section] objectAtIndex:indexPath.row];

第一部分：

[mysections objectAtIndex:indexPath.section]

将返回包含myobject的数组，第二部分objectAtIndex:indexPath.row]将获取索引0处的对象（实际myobject）。

要解决此问题，请更改：

cell.textLabel.text = (NSString *)[[mysections objectAtIndex:indexPath.section] objectAtIndex:indexPath.row];

为：

cell.textLabel.text = ((CharacterObject*)[[mysections objectAtIndex:indexPath.section] objectAtIndex:indexPath.row]).charName;

将从CharacterObject获取属性charName。请注意，这也将转换您的guestObject类，这将是一个问题。您应该测试[[mysections objectAtIndex:indexPath.section] objectAtIndex:indexPath.row]返回的对象的类类型，或者让两个对象继承自实现所需公共方法/属性的类。

UITableViewController错误

1 个答案: