Get a nil when I check url string image

Question

I have empty url string from my image. I keep my url string image in firestore. But sometimes it happens that there is no image and I need to make a check and return an empty image.

When I load my view I get an error nil. Because my variable in firestore is empty.

It's my code:

guard let dataLogoImage = try? Data(contentsOf: URL(string: self.hall!.studioHallLogo)!) else { return }

And later I apply dataLogoImage to variable tempLogoImage.

self.tempLogoImage = UIImage(data: dataLogoImage)

How do I do a check Data or empty url string and avoid nil?

Answer 1

David is right. So here's a sample of URLSession.dataTask usage. This should work for you.

if let urlString = self.hall?.studioHallLogo,
let url = URL(string: urlString) {

    let task = URLSession.shared.dataTask(with: url) { data, response, error in
        guard let data = data, error == nil else { return }

        // execute on main thread
        DispatchQueue.main.async {
            self.tempLogoImage = UIImage(data: data)
        }
    }

    task.resume()
}

As you can see, we're unwrapping your optional stuff safely, such as self.hall?.studioHallLogo, and the creation of your URL object. :) Soon you'll prolly need a library to handle image loading better and with caching. I would love to suggest: Kingfisher

I hope this helps. Good luck.