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SDWebImageを使って画像をダウンロードする

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    [SDWebImageDownloader.sharedDownloader downloadImageWithURL:url
                                                        options:0
                                                       progress:^(NSUInteger receivedSize, long long expectedSize)
    {
         float progress = [@(receivedSize) floatValue]/[@(expectedSize) floatValue];
    } completed:^(UIImage *image, NSData *data, NSError *error, BOOL finished)
    {

    }];

簡単すぎる。。UIImageとNSDataの両方渡してくれるのは非常に助かる。

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