Scrolling UITableView to specific position using setContentOffset not working properly - ObjC

Question

I saw many answers in SO which describes how can I scroll UITableView to the specific position.

I use setContentOffset for scrolling to particular position.

I meet a weird issue. If my tableView is half scrolled then setContentOffset is working properly. But when I scroll to end of the tableView and then use setContentOffset, table view scrolls a little bit more.

My setContentOffset value is CGPoint(0,199).

[self.tableView setContentOffset:CGPointMake(0,199) animated:NO];

After reaching a bottom I use setContentOffset. Then I check the contentOffset of UITableView. and it is 169.

I am not able to figure it out what exactly the issue is.

Edit::

I am using the following code. When a button in the last cell is pressed:

- (void)userPressedSubmitButtonOnLastCell
{

[self updateData];
[self.tableView reloadData];
[self performSelector:@selector(scrollTableView) withObject:nil afterDelay:0.5];
}

- (void)scrollTableView
{
 [self.tableView setContentOffset:CGPointMake(0,199) animated:NO];
}

then where are you setting setContentOffset code and how are you finding table view scrolled bottom, UITableview is an subview of UIScrollView — karthikeyan, Apr 11 '17 at 12:18
I'm guessing this is an issue with the height calculation of your cells. Are you setting both `self.tableView.rowHeight` and `self.tableView.estimatedRowHeight` ? — koen, Apr 11 '17 at 12:25
Please provide more code, otherwise it is very difficult to guess what you need to do. — koen, Apr 11 '17 at 13:51
@Koen I have a table view with Header in it. and approx 10-15 cells with dynamic height. In some cells their is a button. On click of that button I need to reload the table and scroll to top showing 10% of header only. I am updating the question. — Rahul, Apr 11 '17 at 13:54
Please put all this additional info in your question, not in the comments. — koen, Apr 11 '17 at 14:18

score 1 · Answer 1 · answered Apr 11 '17 at 13:12

1

Why don't you use tableView scrollToRowAtIndexPath: or tableView scrollRectToVisible:(CGRect)? This will allow you to scroll to either specific row or rectangle. ContentOffset is more suitable for UIScrollView.

answered Apr 11 '17 at 13:12

Amani Elsaed

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In bottom of my table view(in last row) their is a `UIButton`. On click of that button I need to scroll table view at the top. I can't use `tableView scrollToRowAtIndexPath:` because I have a header (table view header) also. And I need to show some part of Header also. – Rahul Apr 11 '17 at 13:49
I thought your question was about scrolling to the bottom, not to the top? – koen Apr 11 '17 at 13:51
I think you can use 'tableView scrollRectToVisible:' and set rect y = 0, so that it will scroll to top of the table – Amani Elsaed Apr 11 '17 at 13:53

Scrolling UITableView to specific position using setContentOffset not working properly - ObjC

1 Answers1