ios - iOS 中的可扩展 ListView

Question

我需要在我的 iOS 应用程序中创建可扩展 ListView ，即。如果您点击一个单元格，它应该会扩展以提供更多单元格。我正在关注此链接上给出的示例:Toggle showing/hiding child table cells iOS此处也给出了实现文件的代码:http://pastie.org/7756763

但是，在上面的示例中，数组是固定的。我有一个 sqlite 数据库，我在其中存储任务及其开始日期等。我需要创建一个可扩展 View ，其中不同的行是不同的开始日期，当我点击一个日期时，它应该给出该日期的任务。这是代码:

- (void)viewDidLoad
{
    [super viewDidLoad];
    allDates = [[NSMutableArray alloc]init];

    self.date = [[NSMutableArray alloc] initWithObjects: nil];
   // self.date = [[NSMutableArray alloc]init];
    self.listOfSections_DataSource = [[NSMutableArray alloc]initWithObjects:nil];

    sqlite3_stmt *statement;
    const char *dbpath = [mDatabasePath UTF8String];
    if (sqlite3_open(dbpath,&mDiary)== SQLITE_OK) {
        NSString *selectSQL = [NSString stringWithFormat:@"SELECT * FROM TODO"];
        const char *query_stmt = [selectSQL UTF8String];
        if (sqlite3_prepare_v2(mDiary,
                               query_stmt, -1, &statement, NULL) == SQLITE_OK)
        {
                    while(sqlite3_step(statement) == SQLITE_ROW)
            {
                tempTaskName = [[NSString alloc]initWithUTF8String:(const char *) sqlite3_column_text(statement, 2)];
                [allDates addObject:[[NSString alloc]initWithUTF8String:(const char *) sqlite3_column_text(statement, 0)]];

                [self.date addObject:tempTaskName];


            }

    }
    sqlite3_finalize(statement);
}
sqlite3_close(mDiary);

NSLog(@"%i",[allDates count]);

        for(int x = 0;x < [allDates count];x++)
        {
            if (sqlite3_open(dbpath,&mDiary)== SQLITE_OK) {
                NSString *selectSQL = [NSString stringWithFormat:@"SELECT * FROM TODO"];
                const char *query_stmt = [selectSQL UTF8String];

                if (sqlite3_prepare_v2(mDiary,
                                       query_stmt, -1, &statement, NULL) == SQLITE_OK){
            temp = [[NSMutableArray alloc]init];
            while(sqlite3_step(statement) == SQLITE_ROW)
            {
                tempTaskName = [[NSString alloc]initWithUTF8String:(const char *) sqlite3_column_text(statement, 2)];
                NSLog(@"%@",tempTaskName);
               // [allDates addObject:[[NSString alloc]initWithUTF8String:(const char *) sqlite3_column_text(statement, 0)]];
                if([[[NSString alloc]initWithUTF8String:(const char *) sqlite3_column_text(statement, 0)] isEqualToString:allDates[x]])
                {
                    [self.temp addObject:tempTaskName];
                }




            }
            NSLog(@"task name%@",temp);
            [listOfSections_DataSource addObject:temp];

                } sqlite3_finalize(statement);
            }
            sqlite3_close(mDiary);
        }

    //[self.listOfSections_DataSource addObject:allDates];

   NSMutableArray *emptyArray = [[NSMutableArray alloc]init];
   listOfSections = [[NSMutableArray alloc]init];
    for (int i = 0;i<[allDates count]; i++) {
        [listOfSections addObject:emptyArray];
    }  
    self.selectedSection = -1;
    self.selectedSectionTail = -1;
}

表格 View 方法是:

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {


    return [listOfSections_DataSource count];


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

    if(selectedSection !=section)
        return 1;
    else{
        NSArray *array = [listOfSections objectAtIndex:section];

        return [array count];
    }

}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

    static NSString *CellIdentifier = @"cell";

    if(self.selectedSection == indexPath.section){//this is just to check to see if this section is the one we touched

        UITableViewCell *cell =  [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
        if (cell == nil)
        {
            cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
        }

        NSArray *myArray = [listOfSections_DataSource objectAtIndex:indexPath.section];//this now contains your cities
        NSString* myString = [myArray objectAtIndex:indexPath.row]; // get city for that row, under the state

        cell.textLabel.text = myString;
        return cell;
    }
    else{//THIS IS going to happen the first time
        UITableViewCell *cell =  [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
        if (cell == nil)
        {
            cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
        }

            cell.textLabel.text = @"more";

        return cell;
    }
}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {


    UITableViewCell * cell = [tableView cellForRowAtIndexPath:indexPath];

    //check to see if the cell is for exapnding or for selection
    if([cell.textLabel.text isEqualToString:@"more"]){ // this means we need to expand

        listOfSections = [[NSMutableArray alloc]init];
        //setting up the list of section with empty arrays

        NSMutableArray *emptyArray = [[NSMutableArray alloc]init];
        for (int i = 0;i<[allDates count]; i++) {
            [listOfSections addObject:emptyArray];
        }

        //Add array of tasks here
        [listOfSections replaceObjectAtIndex:indexPath.section withObject:[listOfSections_DataSource objectAtIndex:indexPath.section]];


        int tapedRow = [indexPath section];

        self.selectedSection = tapedRow;

        NSMutableIndexSet *myIndexSet = [[NSMutableIndexSet alloc]init];
        [myIndexSet addIndex:selectedSection];
        [myIndexSet addIndex:selectedSectionTail];

        // Updating section in the tableview
        if(selectedSectionTail!=-1)
            [taskTable reloadSections:(NSIndexSet*)myIndexSet withRowAnimation:UITableViewRowAnimationFade];
        else {
            [taskTable reloadSections:[NSIndexSet indexSetWithIndex:indexPath.section] withRowAnimation:
             UITableViewRowAnimationFade];
        }
        //[taskTable reloadData];
    }
    else{
    }
    selectedSectionTail = selectedSection;
}

这里的问题是:1. 屏幕上显示的部分数量是正确的，但是当第一个单元格被点击时，它就消失了。2. 当点击任何单元格时，列表不会展开。

谁能帮帮我？谢谢..

Answer 1

此样本可能就是您要找的:http://developer.apple.com/library/ios/#samplecode/TableViewUpdates/Introduction/Intro.html

该示例从静态数据中提取，但您应该能够更新它以使用数据库中的动态数据，并为任务指定日期等。