Determine which sections of UITableViewController are visible when it is scrolled

Question

I am trying to determine which section of the UITableView is visible (on top, if there are 2 sections simultaneously), in swift 2. So far I found this solution: Is there any way to know if the user is scrolling tableview up or down? in swift IOS , this: How to get a UITableView's visible sections? and this one: Swift - UITableView scroll event

All of them not working for me for reasons:

1. I can not add UIScrollViewDelegate, because swift 2 is giving error on redundant conforming to protocol (because it is UITalbeView, and it already conforms to UIScrollView).

2. However, this:

func scrollViewDidScroll () {
    print("scrolled: \(self.tableView.indexPathsForVisibleRows)")
}

is never being launched.

Delegate and data source for the UITableView are defined through storyboard interface builder.

How would you determine in swift 2 that UITableViewController is being scrolled, and which section is visible?

please try to get visible cell from this method and then get section from this visible cell. — Vvk, Nov 25 '15 at 10:42
@VvkAghera , it works! thank you, can you post this as an answer please, maybe someone will need it later. — Async-, Nov 25 '15 at 10:50

score 4 · Accepted Answer · edited Nov 25 '15 at 14:39

4

please try to get visible cell from willDisplayCell method and then get section from this visible cell. For Example: First get Indexpath from Cell and then retrive section from Indexpath.

let section = indexPath.section

Code is:

override func tableView(tableView: UITableView, willDisplayCell cell: UITableViewCell, forRowAtIndexPath indexPath: NSIndexPath) {
    let cell = self.tableView.dequeueReusableCellWithIdentifier("CustomCell") as! CustomCellViewController

    let position: CGPoint = cell.convertPoint(CGPointZero, toView: self.tableView)
    if let indexPath = self.tableView.indexPathForRowAtPoint(position)
    {
        let section = indexPath.section
        print("will display section: \(section)")
    }
}

edited Nov 25 '15 at 14:39

Async-

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answered Nov 25 '15 at 13:45

Vvk

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great answer thx. 1 thing tho, you should not dequeue cells in this method. Just use the cell property in the delegate. – crashoverride777 Oct 11 '18 at 14:46
@crashoverride777 dequeue is used in cellForRow at indexpath method. – Vvk Oct 12 '18 at 09:32
hey, yes, and the above code is willDisplayCell, were we should not dequeue. – crashoverride777 Oct 12 '18 at 09:33

Determine which sections of UITableViewController are visible when it is scrolled

1 Answers1