CODEWITHSUNDEEP
iosswiftuitableviewuiscrollview
hamedazhar
hamedazhar

Reputation: 1140

setContentOffset not working for UIScrollView inside UITableViewCell for the first time

I have a horizontal UIScrollView which is added as a subview inside custom UITableViewCell. For some cases, I want to change the scrollview content offset which I achieve by doing this code

cell.horizontalScrollView.setContentOffset(CGPoint(x: 300, y: cell.horizontalScrollView.contentOffset.y), animated: true)

inside the UITableView's cellForRowAtIndexPath function and tableview.reloadData() is called whenever I needed to scroll it programmatically.

The issue is, this does not work for the first time. ie,

When the tableview is loaded for the first time, the scrollviews inside the visible cells does not get scrolled according to the code. Its offset is just at (0,0). ---- (This is the issue!)

But after that, when I scrolled the tableView, then the new cells(reused cells) gets updated and scrollviews position gets changed. (which I needed from the start itself!)

So, I want to change the UIScrollView's initial offset(position) programmatically. How can I achieve that?

Upvotes: 0

Views: 1747

Answers (2)

hamedazhar
hamedazhar

Reputation: 1140

Atlast, I found the solution after sitting for a couple of days!

Had to implement layoutIfNeeded for the UITableViewCell inside the cellForRowAtIndexPath method before setting the contentOffset for the UIScrollView.

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

    let cell = tableView.dequeueReusableCell(withIdentifier: "CustomCell", for: indexPath) as! CustomCell
    cell.layoutIfNeeded()
    cell.horizontalScrollView.setContentOffset(CGPoint(x: 300, y: cell.horizontalScrollView.contentOffset.y), animated: false)
    return cell
}

Upvotes: 2

tedd
tedd

Reputation: 65

The best way to implement this is to subclass your cell and then set the content offset in layoutSubviews method.

Upvotes: 0

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