Swift 如何在 Collection View 上显示图像数组

Question

func numberOfSections(in collectionView: UICollectionView) -> Int {
    return 1
}

func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
     print("gallery count : \(self.arrayGallerySingle.count)")
    return self.arrayGallerySingle.count
}

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "gallerycell", for: indexPath) as! GalleryViewCell
return cell
}

//API Fetching method
func galleryFetch(){

    let prs = [
        "id": dealIDGallery,
        "deal_single_page": "1" as String
    ]

    Service.StartWithoutLoading(prs as [String : AnyObject]?, onCompletion: { result in
        let jsonResponseSingle = result as? NSDictionary
        print(" jsonResponse\(String(describing: jsonResponseSingle))")

        if let resultGallery = jsonResponseSingle?.value(forKey: "result") as? NSArray{

            for keyValuesGallery in resultGallery {

                let gallerySingle = (keyValuesGallery as AnyObject).value(forKey: "gallery_images") as? NSArray

                print("Gallery Images Key: \(gallerySingle)")
                self.arrayGallerySingle = gallerySingle as! [AnyObject]

                DispatchQueue.main.async { () -> Void in
                    self.collectionView?.reloadData()

                }
            }

        }
    })
}

如何在 UICollectionViewCell 上显示带有键 gallery_images 的图像数组？此行 print("Gallery Images Key: \(gallerySingle)") 在控制台上打印所需的图像数组，但我无法在 collectionView 上显示.我的 JSON 回复是 http://www.jsoneditoronline.org/?id=8eccb63976d76be7d0b2d1b0e8f02306。我在我的项目中使用 SDWebImage also.I 已经检查了 datasource 连接和 collectionView IBoutlet 以及单元格内的图像。我是 Swift 的初学者，请帮忙，如果需要任何进一步的信息，请询问

Answer 1

Swift 3.0

您可以使用 SDWebcache 实现这种方式，以在 collectionView 单元格图像中加载图像。

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
            let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "gallerycell", for: indexPath) as! GalleryViewCell

            if let imgUrl = arrayGallerySingle[indexPath.row] as? String {
                if let url = URL(string: imgUrl) {
                   //Replace with your imageView outlet
                    cell.imageView.sd_setImageWithURL(url, placeholderImage: UIImage(named: "place holder image"), options: .lowPriority)
                }
            }
            return cell
        }

如果你想在 collectionView 中显示 6 个单元格，那么你必须设置 UICollectionViewLayout 方法来定义单元格的大小，如下所示。

func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize
    {
    return CGSize(width: collectionView.frame.size.width/2, height: collectionView.frame.size.height/3)

}

您可以在数组计数不为空时显示警报以及为什么在 for 循环中重新加载集合视图，如下所示实现。

Service.StartWithoutLoading(prs as [String : AnyObject]?, onCompletion: { result in
            let jsonResponseSingle = result as? NSDictionary
            print(" jsonResponse\(String(describing: jsonResponseSingle))")

            if let resultGallery = jsonResponseSingle?.value(forKey: "result") as? NSArray{

                for keyValuesGallery in resultGallery {

                    let gallerySingle = (keyValuesGallery as AnyObject).value(forKey: "gallery_images") as? NSArray

                    print("Gallery Images Key: \(gallerySingle)")
                    self.arrayGallerySingle = gallerySingle as! [AnyObject]
                }

                if self.arrayGallerySingle.count > 0 {

                    DispatchQueue.main.async { () -> Void in
                        self.collectionView?.reloadData()

                    }

                } else {
                    let alertController = UIAlertController(title: "Your Title", message: "their is no images", preferredStyle: .alert)
                    alertController.addAction(UIAlertAction(title: "OK", style: UIAlertActionStyle.default, handler: nil))
                    self.present(alertController, animated: tru, completion: nil)
                }

            }
        })

Answer 2

Swift 3.0 这是我更新的答案希望它也能帮助别人

func numberOfSections(in collectionView: UICollectionView) -> Int {
    return 1
}

func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
     print("gallery count : \(self.arrayGallerySingle.count)")
    return self.arrayGallerySingle.count

}

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "gallerycell", for: indexPath) as! GalleryViewCell
   if let imgUrl = arrayGallerySingle[indexPath.row] as? String {
        if let url = NSURL(string: imgUrl) {
            cell.galleryImage?.sd_setImage(with: url as URL, placeholderImage: UIImage(named: "place holder image"), options: .lowPriority)
        }
        else{
            let alertController = UIAlertController(title: "No Gallery Images", message: "test", preferredStyle: .alert)
            let okButton = UIAlertAction(title: "Okay", style: .default, handler: nil)
            alertController.addAction(okButton)
            alertController.present(alertController, animated: true, completion: nil)
        }
    }
return cell
}

func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAt section: Int) -> UIEdgeInsets {
    return UIEdgeInsets(top: 0, left: 0, bottom: 0, right: 0)
}

func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumInteritemSpacingForSectionAt section: Int) -> CGFloat {
    return 0.0
}

func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAt section: Int) -> CGFloat {
    return 0.0
}

func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize
{
    return CGSize(width: collectionView.frame.size.width/2, height: collectionView.frame.size.height/3)

}

func galleryFetch(){

    let prs = [
        "id": dealIDGallery,
        "deal_single_page": "1" as String
    ]

    Service.StartWithoutLoading(prs as [String : AnyObject]?, onCompletion: { result in
        let jsonResponseSingle = result as? NSDictionary
        print(" jsonResponse\(String(describing: jsonResponseSingle))")

        if let resultGallery = jsonResponseSingle?.value(forKey: "result") as? NSArray{

            for keyValuesGallery in resultGallery {

                let gallerySingle = (keyValuesGallery as AnyObject).value(forKey: "gallery_images") as? NSArray

                print("Gallery Images Key: \(gallerySingle)")
                self.arrayGallerySingle = gallerySingle as! [AnyObject]

                if self.arrayGallerySingle.count > 0 {

                    DispatchQueue.main.async { () -> Void in
                        self.collectionView?.reloadData()

                    }
                } else {
                    let alertController = UIAlertController(title: "Message", message: "No images found.", preferredStyle: .alert)
                    alertController.addAction(UIAlertAction(title: "OK", style: UIAlertActionStyle.default, handler: self.doSomething))
                    self.present(alertController, animated: true, completion: nil)
                }
            }
        }
    })
}

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