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[Swift]KingFisherで画像URLから画像データをダウンロード

Last updated at Posted at 2016-08-11

KingFisherを利用して、画像URLから画像データ(UIImage型やNSData型)をダウンロードする方法

var images = [UIImage]
var datas = [NSData]

let kf = KingfisherManager.sharedManager.downloader

for file in files {
  kf.downloadImageWithURL(NSURL(string: file.url!)!,
      progressBlock:nil,
      completionHandler: { (image, error, imageURL, originalData) -> () in
        images.append(image)
        datas.append(originalData)
  })
}

 
ちなみに、下記のようにUIImageView.kf_setImageWithURLcompletionHandlerからコールバックする方法では、一度UIImageViewで画像表示され、メモリにキャッシュされた場合のみ、completionHandlerが実行されるみたいで、一度も表示されていない画像についてはcompletionHandlerで画像データを扱うことができないので注意。(結構ハマった)

imageView.kf_setImageWithURL(NSURL(string: "your_image_url")!,
   placeholderImage: nil,
        optionsInfo: nil,
      progressBlock: { (receivedSize, totalSize) -> () in
        print("Download Progress: \(receivedSize)/\(totalSize)")
      },
  completionHandler: { (image, error, cacheType, imageURL) -> () in
    // ★1回表示した画像のみ実行される!
    print("Downloaded and set!")
  }
)

参考

https://github.com/onevcat/Kingfisher/issues/227
https://github.com/onevcat/Kingfisher/issues/94
Kingfisher Reference

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