未载入UITableViewCell中的图像Swift

这是在TableView中为每个Cell重复的函数。正如你所看到的，我在一个名为Product的对象中传入了一系列图像（称为imageset）。 productImages是一个Product数组。在这个对象里面我们有Name，Price和imageSet。未载入UITableViewCell中的图像Swift

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 
}

现在我们本身在自定义的UITableViewCell在哪里见过该产品的信息将被加载和显示。注意：使用ScrollView滚动图片（我从stackoverflow中的问题中提取代码） 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的负荷。图像不。当我调试它时看起来像是在awakeFromNib（）正在运行时，PageImages是空的，但是当我在cellForARowAtIndexPath方法中调试时，var PageImages在该indexPath.row处加载了imageSet。感谢

来源

2015-11-25 Diego

欢迎SO，没有人将要通过所有这些代码。你能否把你的代码编辑到相关的部分？ – Mika

awakeFromNib之前由dequeue...返回细胞因此试图建立你的网页有行不通的执行。我已经看到了这两种方法，其一是有一个方法明确设置单元格：

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

或做在didSet的财产：

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

来源

2015-11-25 16:51:32

谢谢！我尝试了didSet，工作得很好 – Diego

未载入UITableViewCell中的图像Swift

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