Set placeholder image only if image fails to load SDWebImage

Question

I want to show the imageview's background color till the download is in progress and if the download fails or image is not available then i want to show a placeholder image. How can i achieve this?

The main objective is to set the image later not during loading.

Thanks

Answer 1

Solution for Swift 3 :

cell.imageView?.sd_setImage(with: url) { (image, error, cache, urls) in
            if (error != nil) {
                cell.imageView.image = UIImage(named: "ico_placeholder")
            } else {
                cell.imageView.image = image
            }
}

Solution for Objective C :

[cell.imageView sd_setImageWithURL:url
                  placeholderImage:nil
                         completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType, NSURL *imageURL) {
                                if (error) {
                                  self.imageView.image = [UIImage imageNamed:@"ico_placeholder"];
                                } else {
                                  self.imageView.image = image;
                                }
}];

Hope you guys find this useful.

Answer 2

From SDWebImage Documentation :

Using blocks

With blocks, you can be notified about the image download progress and whenever the image retrieval has completed with success or not:

// Here we use the new provided sd_setImageWithURL: method to load the web image

for Swift :

cell.imageView.sd_setImageWithURL(url, placeholderImage:nil, completed: { (image, error, cacheType, url) -> Void in
            if (error) {
                // set the placeholder image here

            } else {
                // success ... use the image
            }
        })

for Objective-C

    [cell.imageView sd_setImageWithURL:[NSURL URLWithString:@"http://www.domain.com/path/to/image.jpg"]
                      placeholderImage:nil
                             completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType, NSURL *imageURL) {
                                    if (error) {
                                      self.imageView.image = [UIImage imageNamed:@"placeHolderImage"];
                                    }
                                 }];

Answer 3

You can do that by passing nil to the placeholder attribute and handling the completion block yourself.

Like this :

    [self.imageView sd_setImageWithURL:self.imageURL
                  placeholderImage:nil
                           options:nil
                          progress:nil
                         completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType, NSURL *imageURL) {
                             if(!error) {
                                 self.imageView.image = image;
                             } else {
                                 self.imageView.image = [UIImage imageNamed:@"placeHolder"];
                             }
                             }];

I haven't tried that. Try it and tell me if that worked for you.