ios表视图分块(QQ列表)

关键代码如下：

– (void)viewDidLoad
{
    [super viewDidLoad];
    self.title = @”我的QQ”;
    //块的数组
    self.listArr = [[NSArray alloc] initWithObjects:@”我的好友”,@”我的同学”,@”我的同事”,@”黑名单”, nil];
    //c代码，bool数组
    flag = (BOOL *)malloc(sizeof(BOOL *));
    memset(flag, YES, sizeof(flag)*[self.listArr count]);
}

#pragma mark – Table view data source块数
– (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    // Return the number of sections.
    return self.listArr.count;
}

#pragma mark – Table view每块的高度
-(float)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section{
    return  40.5;
}

#pragma mark – Table view 每块的列数
– (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    if (flag[section]) {
        return 0;
    }
    else
        return 6;
}

– (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @”Cell”;
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
    }
    cell.textLabel.text = [NSString stringWithFormat:@”奥巴马%i”,indexPath.row];
    return cell;
}

#pragma mark – Table view 每块的块头内容
-(UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section
{
    UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
    button.tag = section;
    [button addTarget:self action:@selector(headerPressed:) forControlEvents:UIControlEventTouchUpInside];
    UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(40, 5, 200, 30)];
    label.text = [self.listArr objectAtIndex:section];
    [button addSubview:label];
    return button;
}

-(void)headerPressed:(id)sender
{
    int section = ((UIButton *)sender).tag;
    flag[section]= !flag[section];
    [self.tableView reloadSections:[NSIndexSet indexSetWithIndex:section] withRowAnimation:UITableViewRowAnimationTop];
}