NSURLConnection subclass with both support for block callbacks and delegation

#!c
NSURL *imageURL = [NSURL URLWithString:@"http://icanhascheezburger.files.wordpress.com/2011/06/funny-pictures-nyan-cat-wannabe1.jpg"];
IEURLConnection *connection = [IEURLConnection connectionWithRequest:[NSURLRequest requestWithURL:imageURL]];
connection.didFailWithErrorHandler = ^(NSError *error) {
    [UIAlertView showAlertWithTitle:@"Download error" message:[error localizedDescription]];

    self.downloadButton.enabled = YES;
    self.progressView.progress = 0.0f;
};
connection.didFinishLoadingHandler = ^(NSURLResponse *response, NSData *responseData){
    self.imageView.image = [UIImage imageWithData:responseData];
    self.downloadButton.enabled = YES;
};
connection.downloadProgressHandler = ^(float progress){
    self.progressView.progress = progress;
};

[connection start];

see more in my blog post http://evsukov.posterous.com/ieurlconnection-nsurlconnection-subclass-with