Update Constraints of Cell Subview

Question

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

Solution

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;
}

Comments

[Mahesh Agrawal]

are you doing this inside custom class of table view cell?

[Mahesh Agrawal]

then inside cell for row at index path..just after initializing cell write like this. [cell layoutIfNeeded];

[user2526811]

I will get right frame now but UI is not updated on screen.

[Mahesh Agrawal]

then try [cell layoutSubViews];. I was also having this type of problem. One of those two option must work.

[user2526811]

try [cell layoutSubViews]; then I am not getting right frame

[Mahesh Agrawal]

Let us continue this discussion in chat.

[inga]

@MaheshAgrawal did you ever find a solution to this problem? I'm experiencing the same issue.

[Mahesh Agrawal]

for me, it was solved by doing layoutIfNeeded and i was getting correct values.

[Pedro Ortiz]

Thanks, layoutIfNeeded worked perfectly for me, and in Swift 5 still working, in my case I had to use that because I update a Collection view cell size after loading from xib file.