如何动态地将UIButton添加到UITableViewCell？

Question

I wanna add an UIButton to a table cell dynamically - please see the below requirements.

When user selects a cell, I'm simply adjusting the height of that table cell in

-(void) tableView:(UITableView*) tableView didSelectRowAtIndexPath:(UIIndexPath*) indexPath {
        selIndPath = [indexPath retain];
        [self.tableView beginUpdates];
        [self.tableView endUpdates];
}

The above method forces the tableView to adjust the height of that selected row. But when I added the UIButton in the above method, the button is not visible.

I'm not interested with the [self.tableView reloadData];

Any help greatly appreciated.

** * ** EDITED * ** * ***

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
    if (selIndPath && selIndPath == indexPath) {
        //UITableViewCell* cell = [self tableView:tableView cellForRowAtIndexPath:indexPath];
//      UIButton* btn = (UIButton*)[[cell contentView] viewWithTag:1234];
//      btn.frame = CGRectMake(40, 60, 60, 24);
//      [cell setNeedsDisplay];
        return 90;
    }
    return 64;
}

- (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] autorelease];
        [[cell contentView] setBackgroundColor:[UIColor clearColor]];
        [[cell backgroundView] setBackgroundColor:[UIColor clearColor]];
    }

    // THIS LINES OF CODE WORKS ONLY ON reloadData
    if (selIndPath && selIndPath == indexPath) {
        UIButton* btn = [UIButton buttonWithType:UIButtonTypeRoundedRect];
        btn.frame = CGRectMake(40, 60, 60, 24);
        btn.tag = 1234;
        [btn setTitle:@"Hi" forState:UIControlStateNormal];
        [cell.contentView addSubview:btn];
    }

    // Configure the cell.
    cell.textLabel.text = @"Loading..";
    return cell;
}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    selIndPath = [indexPath retain];
    [self.tableView deselectRowAtIndexPath:indexPath animated:NO];
    //[self.tableView reloadData];
    [self.tableView beginUpdates];
    [self.tableView endUpdates];
}

Answer 1

The addition of the button will not work if you add it to the cell in cellForRowAtIndexPath : . What you need to do is create a custom UITableViewCell ( Refer to this question's answer on how- Changing the position of custom UIButton in custom UITableViewCell )

In the Custom cell, create a method

-(void) addButtonToCell
{
   UIButton* btn = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    btn.frame = CGRectMake(40, 60, 60, 24);
    btn.tag = 1234;
    [btn setTitle:@"Hi" forState:UIControlStateNormal];
    [self.contentView addSubview:btn];

}

Of course, how you add the button and what arguments you pass to this method is upto you, but you get the gist.

In cellForRowAtIndexPath : , simply add

if (selIndPath && selIndPath == indexPath) {
[cell addButtonToCell];
}