Ios – Update Constraints of Cell Subview

autolayoutiosiphoneobjective cuitableview

I have a custom cell & I am trying to update constraints of subview as below:

CustomeCell.m

-(void)layoutSubviews
{
    [super layoutSubviews];

    _con_view_width.constant = _lbl_property.frame.size.width;
    if(!_btn_imageCount.isHidden)
    _con_view_width.constant = _lbl_property.frame.size.width + _btn_imageCount.frame.size.width;

    NSLog(@"%@",NSStringFromCGRect(_view_lbl_btn.frame));

    [_view_lbl_btn updateConstraintsIfNeeded];
    NSLog(@"%@",NSStringFromCGRect(_view_lbl_btn.frame));

}

Problem
The constraint are working only after reload rows when scrolling

Best Answer

Instead of updateConstraintsIfNeeded try layoutIfNeeded. i think its will work and your code should look like this.

-(void)layoutSubviews
{
    [super layoutSubviews];

    _con_view_width.constant = _lbl_property.frame.size.width;
    if(!_btn_imageCount.isHidden)
    _con_view_width.constant = _lbl_property.frame.size.width + _btn_imageCount.frame.size.width;

    NSLog(@"%@",NSStringFromCGRect(_view_lbl_btn.frame));

    [_view_lbl_btn layoutIfNeeded];
    NSLog(@"%@",NSStringFromCGRect(_view_lbl_btn.frame));

}

EDIT: If you are doing this inside custom cell class then you need to add one more line to cell for row at index path.

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"Cell" forIndexPath:indexPath];
    //[cell layoutIfNeeded];
    [cell layoutSubviews];
    return cell;
}
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