图像未加载到 UITableViewCell Swift

Question

这是对 TableView 中的每个单元格重复的函数。如您所见，我在名为 Product 的对象中传递了一组图像（称为图像集）。 productImages 是一组产品。在这个对象中，我们有 Name、Price 和 imageSet。

func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {

    let cell = tableView.dequeueReusableCellWithIdentifier("productCell", forIndexPath: indexPath) as! ProductHomeCell

    cell.productName.text = productImages[indexPath.row].name
    cell.productPrice.text = "\(productImages[indexPath.row].price)"

    //cell.PageImages contains Array of Images
    cell.pageImages = productImages[indexPath.row].imageSet

    return cell
}

现在我们将使用自定义 UITableViewCell，其中将加载和显示所见产品的信息。注意我使用 ScrollView 滚动图像。（我从 Whosebug 中的一个问题中获取了代码） PageImages 是应该传递 imageSet 的变量。

var pageImages: [UIImage] = []

var pageViews: [UIImageView?] = []
var pageControl : UIPageControl = UIPageControl(frame: CGRectMake(60, 300, 195, 5))


override func awakeFromNib() {


    super.awakeFromNib()
    scrollView.delegate = self
    pageControl = UIPageControl(frame: CGRectMake(230, 14, 107, 37))

    //PageImages should be loaded.
    let pageCount = pageImages.count
    self.pageControl.numberOfPages = pageCount
    configurePageControl()
    pageControl.enabled = false

    // 3
    for _ in 0..<pageCount {
        pageViews.append(nil)
    }

    // 4
    let pagesScrollViewSize = scrollView.frame.size


    scrollView.contentSize = CGSize(width: pagesScrollViewSize.width * CGFloat(pageImages.count),
        height: pagesScrollViewSize.height)


    loadVisiblePages()

}

func loadPage(page: Int) {
    if page < 0 || page >= pageImages.count {
        // If it's outside the range of what you have to display, then do nothing
        return
    }

    // 1
    if let pageView = pageViews[page] {
        // Do nothing. The view is already loaded.
    } else {
        // 2
        var frame = scrollView.bounds
        frame.origin.x = frame.size.width * CGFloat(page)
        frame.origin.y = 0.0

        // 3
        let newPageView = UIImageView(image: pageImages[page])
        // let newPageView = UIImageView(image: imageC)

        newPageView.contentMode = .ScaleAspectFit
        newPageView.frame = frame
        scrollView.addSubview(newPageView)

        // 4
        pageViews[page] = newPageView
    }
}

func loadVisiblePages() {
    // First, determine which page is currently visible
    let pageWidth = scrollView.frame.size.width
    let page = Int(floor((scrollView.contentOffset.x * 2.0 + pageWidth) / (pageWidth * 2.0)))

    // Work out which pages you want to load
    let firstPage = page - 1
    let lastPage = page + 1

    // Purge anything before the first page
    for var index = 0; index < firstPage; ++index {
        purgePage(index)
    }

    // Load pages in our range
    for index in firstPage...lastPage {
        loadPage(index)
    }

    // Purge anything after the last page
    for var index = lastPage+1; index < pageImages.count; ++index {
        purgePage(index)
    }
}

func scrollViewDidScroll(scrollView: UIScrollView) {
    // Load the pages that are now on screen
    loadVisiblePages()
}

func purgePage(page: Int) {
    if page < 0 || page >= pageImages.count{
        // If it's outside the range of what you have to display, then do         nothing
        return
    }

    // Remove a page from the scroll view and reset the container array
    if let pageView = pageViews[page] {
        pageView.removeFromSuperview()
        pageViews[page] = nil
    }
}

override func setSelected(selected: Bool, animated: Bool) {
    super.setSelected(selected, animated: animated)

    // Configure the view for the selected state
}


func configurePageControl() {

    self.pageControl.currentPage = 0
    self.pageControl.tintColor = UIColor.blackColor()

    self.pageControl.pageIndicatorTintColor = UIColor.lightGrayColor()
    self.pageControl.currentPageIndicatorTintColor = UIColor.blackColor()
    self.addSubview(pageControl)
}

func scrollViewDidEndDecelerating(scrollView: UIScrollView) {
    let pageNumber = round(scrollView.contentOffset.x / scrollView.frame.size.width)
    pageControl.currentPage = Int(pageNumber)
}

问题 - 产品名称和价格完美加载。图像没有。当我调试时，当 awakeFromNib() 为运行时，PageImages 看起来是空的，但是当我在 cellForARowAtIndexPath 方法中调试时，var PageImages 加载了 indexPath.row 处的图像集。谢谢

Answer 1

awakeFromNib 在 dequeue... 返回单元格之前执行，因此尝试在那里设置您的页面是行不通的。我见过的两种方法是要么有一种方法来显式设置单元格：

func setupCell(productName:String, productPrice:Double, images:[UIImage]) {
    // Do most of what you have in awakeFromNib here
}

或者在属性的 didSet 中进行：

var pageImages : [UIImage] = [] {
    didSet {
        // Set up your page controller here.
    }
}

图像未加载到 UITableViewCell Swift

Images not loaded in UITableViewCell Swift

scrollview

tableviewcell

ios

swift