Load data from server using swift 4 - json

Question

I try to load the user profile like below
#IBAction func Btn_LoadDataFromDataBase(_ sender: UIButton) {
let myurl = "site.com/profile.php"
LoadURL(url: myurl)
}
func LoadURL(url: String) {
do{
let appURL = URL(string: url)! // convert string to URL
let data = try Data(contentsOf: appURL)
//error here on this line below :
let json1 = try JSONSerialization.jsonObject(with: data ) as! [String: Any]
print(json1)
let query1 = json1["profile"] as! [String: Any]
print(query1)
label_email.text = "Email : (query1["email"]!)"
}catch{
print("error in url")
}
}
if I test the json via webbrowser I get it like this:
{profile : [{"0":"999","id":"999","1":"1","email":"blabla#gmail.com","2":"1111","tel":"00122222222","3":"0" ..........
php code:
print "{profile : ".json_encode($user_profile,JSON_UNESCAPED_UNICODE)."}";
mysql_close($db);
?>

Answer 1

Please read the JSON carefully, there are only two different collection types
{} is dictionary ([String: Any])
[] is array ([Any] but in most cases [[String: Any]])
so the result for query1 (I changed the variable names to something more descriptive) is an array and you need a loop to print all elements:
let profileData = try JSONSerialization.jsonObject(with: data ) as! [String: Any]
let profiles = profileData["profile"] as! [[String: Any]] // could be even [[String:String]]
for profile in profiles {
print("Email :", profile["email"]!")
}
I'm wondering why so many owners of web services send the PHP arrays unnecessarily with both index and key.
And never load data from a remote URL synchronously, use asynchronous URLSession

Answer 2

You're better using URLRequest for async requests. You will need to pass your appURL as a parameter in a URLRequest and handle the answer in its completion handler.
An example:
let urlString = "https://swift.mrgott.pro/blog.json"
guard let url = URL(string: urlString) else { return }
URLSession.shared.dataTask(with: url) { (data, response, error) in
if error != nil {
print(error!.localizedDescription)
}
guard let data = data else { return }
// Implement JSON decoding and parsing
do {
let articlesData = try JSONDecoder().decode([OBJECT YOU WANT].self, from: data)
} catch let jsonError {
print(jsonError)
}
}.resume()