Swift - UITableView scroll event

问题:

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.view.endEditing(true).

Thanks in advance

回答1:

You can add UIScrollViewDelegate. After that you can implement scrollViewDidScroll method.

回答2:

You can set property of UITable view (XCode 7+)

In Storyboard:

in Code:

tableView.keyboardDismissMode = .onDrag

回答3:

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

        if(velocity.y>0){
            NSLog("dragging Up");
        }else{
            NSLog("dragging Down");
        }
    }

回答4:

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.