Why is Xcode complaining when I wrap this let in an if statement? - swift

Question

I have the following working code in my app:
func downloadJSON(completed: #escaping ([JsonFile.JsonBonuses]?) -> ()) {
let url = URL(string: "http://example.com/ExampleData.json")!
URLSession.shared.dataTask(with: url) { (data, response, error) in
if error == nil, let data = data {
do {
let posts = try JSONDecoder().decode(JsonFile.self, from: data)
completed(posts.bonuses)
self.defaults.set(posts.meta.version, forKey: "jsonVersion")
print("URLSession did not fail")
print("JSON Version Set to \(posts.meta.version)")
} catch {
print("Can't decode JSON: \(error)")
}
} else {
print("downloadJSON completed")
completed(nil)
}
}.resume()
}
I am wanting to change that URL to a different one based on a UserDefaults setting. So I wrapped the let url in an if statement like this:
if devModeStatus == true {
let url = URL(string: "https://otherexample.com/Example2Data.json")!
} else if devModeStatus == false {
let url = URL(string: "http://example.com/ExampleData.json")!
} else {
print("Invalid Dev Status encountered!")
return
}
However when I do that, Xcode complains about "Use of unresolved identifier 'url'; did you mean 'erfl'?" on the line that says URLSession.shared.dataTask(with: url) { (data, response, error) in
I'm not sure why it is complaining about this change. I use that same if/else logic else where to print a status message at first load of this view, so I know the variable is correct.

Answer 1

Your url declaration dies within those if, else-if scopes. You need to declare your url first then modify it. Also, since devModeStatus is a boolean value, the else case will never be reached, so no need for third path. Update your code as following:
let url: URL
if devModeStatus {
url = URL(string: "https://otherexample.com/Example2Data.json")!
} else {
url = URL(string: "http://example.com/ExampleData.json")!
}