Error Handling in Swift 3
One way you can do is throwing your own errors on finding nil.
With having this sort of your own error:
enum MyError: Error { case FoundNil(String)}You can write something like this:
do{ let xmlString = try String(contentsOf: accessURL, encoding: String.Encoding.utf8) guard let xmlDict = XMLDictionaryParser.sharedInstance().dictionary(with: xmlString) else { throw MyError.FoundNil("xmlDict") } guard let models = xmlDict["Cygnet"] as? NSArray else { throw MyError.FoundNil("models") } self.cygnets = models } catch { print("error getting xml string: \(error)") }