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[已解决]swift中判断UITableView开始滚动

Swift crifan 1195浏览 0评论

swift UITableView scroll

swift UITableView begin scroll

How to know when UITableView did scroll to bottom in iPhone – Stack Overflow

Xcode中点击找到:

UITableViewDelegate

-》UIScrollViewDelegate

public protocol UIScrollViewDelegate : NSObjectProtocol {
   
    @available(iOS 2.0, *)
    optional public func scrollViewDidScroll(scrollView: UIScrollView) // any offset changes
    @available(iOS 3.2, *)
    optional public func scrollViewDidZoom(scrollView: UIScrollView) // any zoom scale changes
   
    // called on start of dragging (may require some time and or distance to move)
    @available(iOS 2.0, *)
    optional public func scrollViewWillBeginDragging(scrollView: UIScrollView)
    // called on finger up if the user dragged. velocity is in points/millisecond. targetContentOffset may be changed to adjust where the scroll view comes to rest
    @available(iOS 5.0, *)
    optional public func scrollViewWillEndDragging(scrollView: UIScrollView, withVelocity velocity: CGPoint, targetContentOffset: UnsafeMutablePointer<CGPoint>)
    // called on finger up if the user dragged. decelerate is true if it will continue moving afterwards
    @available(iOS 2.0, *)
    optional public func scrollViewDidEndDragging(scrollView: UIScrollView, willDecelerate decelerate: Bool)
   
    @available(iOS 2.0, *)
    optional public func scrollViewWillBeginDecelerating(scrollView: UIScrollView) // called on finger up as we are moving
    @available(iOS 2.0, *)
    optional public func scrollViewDidEndDecelerating(scrollView: UIScrollView) // called when scroll view grinds to a halt
   
    @available(iOS 2.0, *)
    optional public func scrollViewDidEndScrollingAnimation(scrollView: UIScrollView) // called when setContentOffset/scrollRectVisible:animated: finishes. not called if not animating
   
    @available(iOS 2.0, *)
    optional public func viewForZoomingInScrollView(scrollView: UIScrollView) -> UIView? // return a view that will be scaled. if delegate returns nil, nothing happens
    @available(iOS 3.2, *)
    optional public func scrollViewWillBeginZooming(scrollView: UIScrollView, withView view: UIView?) // called before the scroll view begins zooming its content
    @available(iOS 2.0, *)
    optional public func scrollViewDidEndZooming(scrollView: UIScrollView, withView view: UIView?, atScale scale: CGFloat) // scale between minimum and maximum. called after any ‘bounce’ animations
   
    @available(iOS 2.0, *)
    optional public func scrollViewShouldScrollToTop(scrollView: UIScrollView) -> Bool // return a yes if you want to scroll to the top. if not defined, assumes YES
    @available(iOS 2.0, *)
    optional public func scrollViewDidScrollToTop(scrollView: UIScrollView) // called when scrolling animation finished. may be called immediately if already at top
}

最后用:

    //will call multiple time during scroll
//    func scrollViewDidScroll(scrollView: UIScrollView){
//        if self.inputMessageTextField.isFirstResponder() {
//            self.inputMessageTextField.resignFirstResponder()
//        }
//    }
    //only call once, when begin to scroll
    func scrollViewWillBeginDragging(scrollView: UIScrollView){
        dismissKeyboard()
    }
    func dismissKeyboard(){
        if self.inputMessageTextField.isFirstResponder() {
            self.inputMessageTextField.resignFirstResponder()
        }
    }

即可实现:

开始滚动时,之前显示的键盘就消失了。

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