Swift - UITableView scroll event

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深忆病人
深忆病人 2021-02-18 14:22

I was wondering how to detect if the UITableView is scrolled (up or down). I want to hide the keyboard when the UITableView is scrolled with self

4条回答
  •  既然无缘
    2021-02-18 14:56

    I believe the complete solution would be the following:

    func scrollViewDidScroll(_ scrollView: UIScrollView) {
        if scrollView == feedTableView {
            let contentOffset = scrollView.contentOffset.y
            print("contentOffset: ", contentOffset)
            if (contentOffset > self.lastKnowContentOfsset) {
                print("scrolling Down")
                print("dragging Up")
            } else {
                print("scrolling Up")
                print("dragging Down")
            }
        }
    }
    
    func scrollViewDidEndDragging(_ scrollView: UIScrollView, willDecelerate decelerate: Bool) {
        if scrollView == feedTableView {
            self.lastKnowContentOfsset = scrollView.contentOffset.y
            print("lastKnowContentOfsset: ", scrollView.contentOffset.y)
        }
    }
    

    The previous answers weren't 100% accurate.

    Explanation: scrollViewDidEndDragging will be called when the scrolling stops, therefore we save the last know offset. After that we compare it with the current offset in the delegate method scrollViewDidScroll.

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