我想要缓存图像而不在任何 imageView 中显示它们我想如何在我稍后更改为使用 by url 时取得进展

Question

SDWebImageDownloader *downloader = [SDWebImageDownloader sharedDownloader];
                [downloader downloadImageWithURL:[[NSURL alloc] initWithString:url]
                                         options:0
                                        progress:^(NSInteger receivedSize, NSInteger expectedSize) {
                                            // progression tracking code
                                        }
                                       completed:^(UIImage *image, NSData *data, NSError *error, BOOL finished) {
                                           if (image && finished) {
}});

Answer 1

如果您想使用 SDWebImage，那么只需使用 url 下载数据，不要将其分配给 imageView，您使用的库将通过这样做来缓存它。

Answer 2

试试这个：

-(UIImage *)downloadImageAsync:(NSString *)imageKey
{
     NSLog(@"image key : %@",imageKey);
      __block UIImage *returnedImage;
      SDWebImageManager *manager = [SDWebImageManager sharedManager];
      [manager downloadWithURL:[NSURL URLWithString:imageKey] options:0 progress:^(NSUInteger receivedSize, long long expectedSize){
       NSLog(@"received size %d expected size %lld", receivedSize, expectedSize);

     }completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType,BOOL finished){
       if(image && finished) {
           returnedImage = image;
       }
  }];

   if(returnedImage == nil) {
      NSLog(@"Returned Image Nil");
   }
  return returnedImage;
}

我想要缓存图像而不在任何 imageView 中显示它们我想如何在我稍后更改为使用 by url 时取得进展

I want cache images without show them in any imageView how do this i want do progress while I´m change to use the by url later

ios

objective-c

sdwebimage