Question 69076 in IOS Swift Question posted in
The official documentation can be found here.

Get default scroll direction for UIScrollView Swift – Ios swift

I have an application that uses more UIScrollViews and extensions from it like UICollectionViews and UITableViews and for a little dynamism I have created some general functions to help me with some paddings / margins.

My functions are created as extensions for UIScrollView and I want to use them just when the scroll view is only vertical.

My Question

How can I find the scrolling direction of a UIScrollView?

I have found a lot of answers of how to find the scrolling direction, but I need when the UIScrollView is initialised to find the scrolling direction of it, if it’s vertical or horizontal.

Thank you for your time!

Tags:

2

Answers


  1. 0

    One solution I can think of in order to get the scroll direction before scrolling is to react accordingly to the type of UIScrollView in question.

    So first step check if it is a UIScrollView, UICollectionView or UITableView.

    In the case of a UITableView

    I think a fair assumption here is that the scrolling direction will be vertical

    In the case of a UIScrollView

    This one could be tricky but I guess here you would have to compare the content size of the scroll view with the frame of the scrollview as Desdenova suggested and this can suggest if you can scroll horizontally and / or vertically.

    In the case of a UICollectionView

    This data will lie in the in the layout of the UICollectionView.

    For example, I set up a basic UICollectionView in Storyboard using a FlowLayout without any data in it.

    UICollectionView UICollectionViewFlowLayout scroll direction

    Then I add this code somewhere appropriate

    if let layout = collectionView.collectionViewLayout as? UICollectionViewFlowLayout
{
    if layout.scrollDirection == .horizontal {
        print("horizontal")
    }
    else {
        print("vertical")
    }
}

    This prints out horizontal.

    Login or Signup to reply.
  2. 0

    For the UIScrollView you have to use the UIScrollViewDelegate scrollViewDidScroll which is helps you in UIScrollView’s Scroll direction also for that you have to add some checks for the get the directions:

    func scrollViewDidScroll(scrollView: UIScrollView!) {
    // Update ScrollView direction
    if self.lastContentOffset.y > scrollView.contentOffset.y && self.lastContentOffset.y < scrollView.contentOffset.y {
            // Vertical Scroll
    } else {
            // Horizontal Scroll
    }
}
    Login or Signup to reply.
Please signup or login to give your own answer.

Back To Top
Search