CODEWITHSUNDEEP
swiftuiscrollviewcontentoffset
Myreaux
Myreaux

Reputation: 43

UIScrollView contentOffset returns always zero in Swift

I want to track the position of my horizontal scrollView, yet when I print the contentOffset.x or contentOffset, they always return zero. This is the code for my class:

import UIKit

class ScrollForecast: UIScrollView, UIScrollViewDelegate {


@IBOutlet weak var scrollTemp: UILabel!

func scrollViewDidScroll(_ scrollView: UIScrollView) {
    print(self.contentOffset.x)

}

func scrollViewWillEndDragging(_ scrollView: UIScrollView, withVelocity velocity: CGPoint, targetContentOffset: UnsafeMutablePointer<CGPoint>) {

    scrollView.decelerationRate = UIScrollViewDecelerationRateFast

    let cellWidth: CGFloat = 40
    var index = round(targetContentOffset.pointee.x / cellWidth)
    targetContentOffset.pointee.x = index * cellWidth
}

}

Any ideas as to what might be the problem? The code inside scrollViewDidEndDragging works just fine and sets the contentOffset so that the scrollView snaps every 40 points.

Upvotes: 2

Views: 1443

Answers (1)

MdaG
MdaG

Reputation: 2730

Make sure that scrollView.contentSize is large enough to allow it to scroll. Otherwise targetContentOffset.pointee.x will be zero.

Upvotes: 1

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