How to declare this method in swift with a completion block?

Question

I can't find out how to declare the following method in swift:

- (void)downloadImageWithURL:(NSURL *)url completionBlock:(void (^)(BOOL succeeded, UIImage *image))completionBlock {

NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
[NSURLConnection sendAsynchronousRequest:request
                                   queue:[NSOperationQueue mainQueue]
                       completionHandler:^(NSURLResponse *response, NSData *data, NSError *error) {
                           if ( !error )
                           {
                                UIImage *image = [[UIImage alloc] initWithData:data];
                                completionBlock(YES,image);
                            } else{
                                completionBlock(NO,nil);
                            }
                       }];
}

I found this method from natashatherobot blog : http://natashatherobot.com/ios-how-to-download-images-asynchronously-make-uitableview-scroll-fast/

I would like to call same method in swift and once the asynchronous request gets the image pass it to the completionBlock.

What would you suggest ?

Possible duplicate of How to use NSURLConnection completionHandler with swift — NSNoob
– NSNoob, Commented Nov 13, 2015 at 11:49

Drizztneko · Accepted Answer · 2015-11-13 12:13:08Z

1

func downloadImageWithURL(url: NSURL, completionBlock: (succeeded: Bool, image: UIImage?) -> ()) {
    let request = NSMutableURLRequest(URL: url)
    NSURLConnection.sendAsynchronousRequest(request, queue: NSOperationQueue.mainQueue()) { (response, data, error) in
        if error == nil {
            let image = UIImage(data: data!)
            completionBlock(succeeded: true, image: image!)
        } else {
            completionBlock(succeeded: false, image: nil)
        }
    }
}

answered Nov 13, 2015 at 12:13

Drizztneko

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1 Comment

Sam Over a year ago

Thanks dude, you rock ! ;)

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