timer - 如何从最后一个单元格滚动回滚动视图的第一个单元格以及如何在 swift 4 中为每个单元格添加一个按钮？

Question

我在我的项目中使用了滚动视图，它看起来像页面视图控制器，它使用计时器滚动并且运行良好。当到达最后一个单元格时，我想要滚动视图从最后一个单元格滚动到第一个单元格。这是我用于更改单元格的代码

    @objc func moveToNextPage (){

    let pageWidth:CGFloat = self.scrollView.frame.width
    let maxWidth:CGFloat = pageWidth * 4
    let contentOffset:CGFloat = self.scrollView.contentOffset.x

    var slideToX = contentOffset + pageWidth

    if  contentOffset + pageWidth == maxWidth
    {
        slideToX = 0
    }
    self.scrollView.scrollRectToVisible(CGRect(x:slideToX, y:0, width:pageWidth, height:self.scrollView.frame.height), animated: true)
}

还有一件事！我想为每个页面添加一个按钮但我不能这样做所以这是我的滚动视图方法

func addscrollV()
{

    scrollView.delegate = self
    var selectingItem = Int()
    for i in 0...(initials?.response.count)! - 1 {
        if ((initials.initInstamall?.response[i].type!)!) == "0" {
            selectingItem = i
            break
        }
    }

    for image in 0...(initials?.response[selectingItem].itemLists.count)! - 1 {
        let imageView = UIImageView()
        let placeHolderImage = UIImage(named : "ic_logo")
        let url = "http://www.example/\((initials?.response[selectingItem].itemLists[image].imagePath!)!)"
        let urls = URL(string: url)
        imageView.kf.setImage(with: urls , placeholder : placeHolderImage ,options:[.transition(ImageTransition.fade(1.0))])
        let xCoordinate = self.contentView.frame.width * CGFloat(image)
        contentWidth += self.contentView.frame.width
        scrollView.addSubview(imageView)
        imageView.frame = CGRect(x: xCoordinate , y: 0 , width: self.contentView.frame.width, height: self.contentView.frame.height)
        selectScrollImage.frame = CGRect(x: xCoordinate , y: 0 , width: self.contentView.frame.width, height: self.contentView.frame.height)
        selectScrollImage.tag = image
        selectScrollImage.addTarget(self, action: #selector
            (scrollImageSelected), for: UIControlEvents.touchUpInside)
        imageView.contentMode = .scaleAspectFill
        imageView.clipsToBounds = true
        scrollView.addSubview(selectScrollImage)
        imageView.addSubview(selectScrollImage)
        imageView.bringSubview(toFront: selectScrollImage)
        selectScrollImage.backgroundColor = UIColor.blue
    }

    scrollView.contentSize = CGSize(width: contentWidth, height: self.contentView.frame.height)
}

标签： timeruiscrollviewuibuttonswift4