Delete image out of array at given index

Question

I have created and initialized a scrollview that pulls from an array of images. So a user swipes past a photo, then another, and I need to delete the image based on the location of the current image I have created a for loop that deletes the image i-- in the array, but this crashes because I can't delete the i. Is there a way I can accomplish this? Thank you: here is my code

class ViewController: UIViewController {
var imageArray = [UIImage]()

@IBOutlet weak var mainScrollView: UIScrollView!

  func scrollViewDidScroll(_ scrollView: UIScrollView) {
        for i in 0..<imageArray.count {
            if i >= 3 {
                imageArray.remove(at: i - 2)
            }
    }
}


override func viewDidLoad() {
super.viewDidLoad()
mainScrollView.frame = view.frame
imageArray = [#imageLiteral(resourceName: "dubai6"), #imageLiteral(resourceName: "dubai2"), #imageLiteral(resourceName: "dubai7"), #imageLiteral(resourceName: "dubai4"), #imageLiteral(resourceName: "dubai3"), #imageLiteral(resourceName: "dubai5"), #imageLiteral(resourceName: "DigitalDrawingPreview"), #imageLiteral(resourceName: "denarus"), #imageLiteral(resourceName: "dubai1")]
for i in 0..<imageArray.count  {
    let imageView = UIImageView()
    imageView.contentMode = .scaleAspectFit
    imageView.image = imageArray[i]
    let xPosition = self.view.frame.width * CGFloat(i)
    imageView.frame = CGRect(x: xPosition, y: 0, width: self.view.frame.width, height: self.mainScrollView.frame.height)

    mainScrollView.contentSize.width = mainScrollView.frame.width * CGFloat(i + 1)
    mainScrollView.addSubview(imageView)
}

This code example isn't really complete, can you add the full example. — john_ryan
– john_ryan, Commented Mar 21, 2017 at 17:58
I believe this is all my code I can check but I'm pretty sure this what I got, just a scroll view with images john_ryan 36 — Randy Windin
– Randy Windin, Commented Mar 21, 2017 at 18:35
Ok i assumed there would be some code that handled the scroll, otherwise how would you remove the last image once the user scrolled to the next — john_ryan
– john_ryan, Commented Mar 21, 2017 at 18:36
john_ryan i added the scrollviewdidscroll method check it out, still not working — Randy Windin
– Randy Windin, Commented Mar 22, 2017 at 2:26

dmorrow · Accepted Answer · 2017-03-21 20:14:06Z

1

Rather than using a UIScrollView, I would recommend using a UITableView or UICollectionView. It is very easy to manage the data model and then call table.reloadData().

You would track the scroll position with the ScrollViewDelegate method scrollViewDidScroll(_ scrollView) and force a reload once you've scrolled far enough.

answered Mar 21, 2017 at 20:14

dmorrow

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4 Comments

Randy Windin Over a year ago

dmorrow I cannot use a table view, so ill try using the reload idea in the did scroll

dmorrow Over a year ago

@RandyWindin Why can't you use a table view? It's just a scroll view with external logic about how to place repeating objects.

Randy Windin Over a year ago

well it is a horozontial scroll not verticle, i created this to see images that you can scroll through like on your photo album on your phone.

dmorrow Over a year ago

The you should use a UICollectionView, which can scroll in either direction. This use case is exactly the type of thing it is designed for.

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