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我有一个应用程序，它有一个 tabbarcontroller，每个选项卡都包含一个 navigationcontroller。每个导航控制器都以名为 DetailViewController 的视图控制器结束。但是，如果用户在一个选项卡上导航到 DetailViewController，然后切换选项卡并在那里也导航到 DetailViewController，那么应用程序会因错误而崩溃：

2011-08-19 21:14:45.257 Kluringar[4368:ef03] *** Terminating app due to uncaught exception 'NSRangeException', reason: '*** -[__NSArrayM objectAtIndex:]: index 3 beyond bounds [0 .. 0]'

推送 DetailViewController 的代码如下所示：

-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    kluringIdString = [[kluringar objectAtIndex:indexPath.row] objectForKey:@"id"];
    DetailViewController *detail = [self.storyboard instantiateViewControllerWithIdentifier:@"detail"];
    [self.navigationController pushViewController:detail animated:YES];
}

从数据库中获取数据并将其添加到数组中的代码如下所示：

-(void) getAllRowsFromTableNamed {
    //—-retrieve rows—- 
    NSString *qsql = [NSString stringWithFormat:@"SELECT * FROM Kluringar ORDER BY rubrik"];    
    sqlite3_stmt *statement;    
    kluringar = [[NSMutableArray alloc] init];
    NSMutableDictionary *kluringarDictionary = [[NSMutableDictionary alloc] init];
    if (sqlite3_prepare_v2( db, [qsql UTF8String], -1, &statement, nil) == SQLITE_OK) {     
        while (sqlite3_step(statement) == SQLITE_ROW) {
            char *kluringId = (char *) sqlite3_column_text(statement, 2);           
            NSString *kluringIdStr = [[NSString alloc] initWithUTF8String: kluringId];
            char *rubrik = (char *) sqlite3_column_text(statement, 3);          
            NSString *rubrikStr = [[NSString alloc] initWithUTF8String: rubrik];
            //---add items--- 
            [kluringarDictionary setValue:kluringIdStr forKey:@"id"];
            [kluringarDictionary setValue:rubrikStr forKey:@"rubrik"];
            [kluringar addObject:[kluringarDictionary copy]];       
        }   
        //—-deletes the compiled statement from memory—-        
        sqlite3_finalize(statement);        
    }   
}

这是故事板的链接：storyboard

提前比！:)

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1 回答 1

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您尝试访问此行中的数组

kluringIdString = [[kluringar objectAtIndex:indexPath.row] objectForKey:@"id"];

那应该有多个元素，但它没有。我建议你查看你的代码，看看有多少元素被添加到 kluringar 数组中。

于 2011-08-19T19:47:24.483 回答