Question

Just like the title says. Given:

[imageView setImageWithURL:[NSURL URLWithString:imageurl]];

What is the best way to perform tasks once the image is loaded (or pulled from the cache) and displayed?

Answer 1

The setImageWithURL API is a super convenience method but you need a little more control so I suggest loading the image yourself with (heavily inspired from https://github.com/rs/SDWebImage/blob/master/README.md):

SDWebImageManager *manager = [SDWebImageManager sharedManager];
UIImage *cachedImage = [manager imageWithURL:url];

if (cachedImage) {
    [imageView setImage:cachedImage];
    [self doMyOtherCustomStuff];
} else {
    [manager downloadWithURL:url delegate:self];
}

…

- (void)webImageManager:(SDWebImageManager *)imageManager didFinishWithImage:(UIImage *)image
{
    [imageView setImage:image];
    [self doMyOtherCustomStuff];
}

good luck!