My catch isn't working on url request

Question

I am trying to do my first try catch in Swift.

Essentially the user can give a name to something. So say he/she types in Gmail and hits submit.

Since G is the first letter of the String (doesn't matter if its lower or upper case) the image will load a picture of a G.

If the user also adds in a URL so say gmail.com or www.gmail.com it will pull the favicon for gmail.

So far so good.

HOWEVER. If the person types gmailllllll.com

it loads a picture of a globe (which I think is the default)

What I am trying to do is only put the gmail favicon in the image view if it is actually the image. If it is nil then I want to put the image of the G which I provided.

I understand why my code isn't working. I just do not know how to add to it to do what I want.

 DispatchQueue.main.async {
  let myURLString: String = "http://www.google.com/s2/favicons?domain=\(self.serviceArray[row].serviceUrl)"
  let myURL = URL(string: myURLString)
  do {
    let myData = try Data(contentsOf: myURL!)


    cell.serviceLogoImage.image = UIImage(data: myData)

  } catch {
    cell.serviceLogoImage.image = UIImage.init(named: "\(self.getLetterOrNumberAndChooseImage(text: self.serviceArray[row].serviceName))")
  }

}

Also, If the user were to type in www.go google.com with the space it has an optional crashe!

I tried saying

if myData == nil {...}

But it says it always returns false...

Any help would be appreciated

Answer 1

Optional binding

This solution avoids force unwrapping (ie myURL!) with optional binding.

Note that try? returns an optional. It returns nil rather than throwing an error. It is appropriate when you want to handle all errors in the same way.

let myURLString: String = "http://www.google.com/s2/favicons?domain=\(self.serviceArray[row].serviceUrl)"
if let myURL = URL(string: myURLString), let myData = try? Data(contentsOf: myURL), let image = UIImage(data: myData) {
    cell.serviceLogoImage.image = image
}
else {
    cell.serviceLogoImage.image = UIImage.init(named: "\(self.getLetterOrNumberAndChooseImage(text: self.serviceArray[row].serviceName))")
}