UITableView - scroll to the top

Question

In my table view I have to scroll to the top. But I cannot guarantee that the first object is going to be section 0, row 0. May be that my table view will start from section

Answer 1

In Swift-3 :

self.tableView.setContentOffset(CGPoint.zero, animated: true)

Answer 2

Adding on to what's already been said, you can create a extension (Swift) or category (Objective C) to make this easier in the future:

Swift:

extension UITableView {
    func scrollToTop(animated: Bool) {
        setContentOffset(CGPointZero, animated: animated)
    }
}

Any time you want to scroll any given tableView to the top you can call the following code:

tableView.scrollToTop(animated: true)

Answer 3

Since my tableView is full of all kinds of insets, this was the only thing that worked well:

Swift 3

if tableView.numberOfSections > 0 && tableView.numberOfRows(inSection: 0) > 0 {
  tableView.scrollToRow(at: IndexPath(row: 0, section: 0), at: .top, animated: true)
}

Swift 2

if tableView.numberOfSections > 0 && tableView.numberOfRowsInSection(0) > 0 {
  tableView.scrollToRowAtIndexPath(NSIndexPath(forRow: 0, inSection: 0), atScrollPosition: .Top, animated: true)
}

Answer 4

This was the only code snippet that worked for me

Swift 4:

    tableView.scrollRectToVisible(CGRect(x: 0, y: 0, width: 1, height: 1), animated: true)
    tableView.scrollToRow(at: IndexPath(row: 0, section: 0), at: .top, animated: true)
    tableView.setContentOffset(CGPoint(x: 0, y: -70), animated: true)

P.S. 70 is the height of my header and table view cell

Answer 5

Here is a simple example of UIScrollView extension that you can use everywhere in your app.

1) First you should create enum with possible scroll directions:

enum ScrollDirection {
    case top, right, bottom, left

    func contentOffsetWith(_ scrollView: UIScrollView) -> CGPoint {
        var contentOffset = CGPoint.zero
        switch self {
            case .top:
                contentOffset = CGPoint(x: 0, y: -scrollView.contentInset.top)
            case .right:
                contentOffset = CGPoint(x: scrollView.contentSize.width - scrollView.bounds.size.width, y: 0)
            case .bottom:
                contentOffset = CGPoint(x: 0, y: scrollView.contentSize.height - scrollView.bounds.size.height)
            case .left:
                contentOffset = CGPoint(x: -scrollView.contentInset.left, y: 0)
            }
        return contentOffset
    }
}

2) Then add extension to UIScrollView:

extension UIScrollView {
    func scrollTo(direction: ScrollDirection, animated: Bool = true) {
        self.setContentOffset(direction.contentOffsetWith(self), animated: animated)
    }
}

3) Thats it! Now you can use it:

myScrollView.scrollTo(.top, animated: false)

This scroll bind to the tableView's content size and it looks more natural than scroll to CGPoint.zero

Answer 6

UITableView is a subclass of UIScrollView, so you can also use:

[mainTableView scrollRectToVisible:CGRectMake(0, 0, 1, 1) animated:YES];

Or

[mainTableView setContentOffset:CGPointZero animated:YES];

And in Swift:

mainTableView.setContentOffset(CGPointZero, animated:true)

And in Swift 3 & above:

mainTableView.setContentOffset(.zero, animated: true)