Question

使用Collection View时，我在集合视图中显示了图像数组，现在我需要在更大尺寸的另一个视图中显示所选图像。所以我实现如下。

func collectionView（collectionView：UICollectionView，numberOfItemsInSection section：Int） - ＆gt; Int {

    return logoImage.count
}


func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {

   let cell : PhotoCollection = collectionView.dequeueReusableCellWithReuseIdentifier("PhotoCells", forIndexPath: indexPath) as PhotoCollection
    cell.imageView.image = logoImage[indexPath.row]
    return cell

}


func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath) {

    var newCell :PhotoCollection = collectionView.cellForItemAtIndexPath(indexPath) as PhotoCollection
    var fullImageVw : FullImageClass = self.storyboard?.instantiateViewControllerWithIdentifier("FullImage") as FullImageClass
      fullImageVw.imageFull.image = newCell.imageView.image
    self.navigationController?.pushViewController(fullImageVw, animated: true)


}

但是在解开fullImageVw.imageFull.image = newCell.imageView.image行中的Optional值时意外发现错误为nil。但是newCell.imageView.image还有一个值我还不知道为什么会遇到这个错误。任何人都可以帮我解决这个错误。

Answer 1

我通常会在故事板中创建一个segue，在选中时会转到详细信息视图，然后使用didSelectItemAtIndexPath而不是prepareForSegue使用override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) { if (segue.identifier == "DetailSegue"){ let cell = sender as Cell var destination = segue.destinationViewController as DetailViewController destination.image = cell.imageView.image } }

{{1}}

就你的具体问题而言，我并不确定是什么导致它返回nil，但我基本上已经完成了你多次尝试这样做的方式并且它已经有效，所以希望它对你有用太

Answer 2

我今天遇到了同样的问题。由于您的视图是在故事板中创建的，但是您以编程方式调用它，因此在您调用时视图不会完全呈现 fullImageVw.imageFull.image = newCell.imageView.image

您可以在之前的线路上运行fullImageVw.view fullImageVw.imageFull.image = newCell.imageView.image 以这种方式，fullImageVw.imageFull的imageView将不会是nil，它将正常工作希望它有所帮助

var newCell :PhotoCollection = collectionView.cellForItemAtIndexPath(indexPath) as PhotoCollection
var fullImageVw : FullImageClass = self.storyboard?.instantiateViewControllerWithIdentifier("FullImage") as FullImageClass
fullImageVw.view
fullImageVw.imageFull.image = newCell.imageView.image
self.navigationController?.pushViewController(fullImageVw, animated: true)

实现单个单元格选择以在swift中显示详细视图

2 个答案: