Swift does not assign variables from JSON results
I have a problem loading JSON results into swift (php connection).
I can get JSON data, but that won't let me assign it to a variable.
it always assigns the results as Optional
.
JSON data:
{
"country": [{
"id": 1,
"name": "Australia",
"code": 61
}, {
"id": 2,
"name": "New Zealand",
"code": 64
}]
}
XCode output:
["country": <__NSArrayI 0x60000002da20>(
{
code = 61;
id = 1;
name = Australia;
},
{
code = 64;
id = 2;
name = "New Zealand";
}
)
]
Country Name: Optional(Australia)
Country Name: Optional(New Zealand)
Swift file:
//function did_load
override func viewDidLoad() {
super.viewDidLoad()
//created RequestURL
let requestURL = URL(string: get_codes)
//creating NSMutable
let request = NSMutableURLRequest(url: requestURL!)
//setting the method to GET
request.httpMethod = "GET"
//create a task to get results
let task = URLSession.shared.dataTask(with: request as URLRequest) {
data, response, error in
if error != nil{
print("error is \(String(describing: error))")
return;
}
//lets parse the response
do {
let json = try JSONSerialization.jsonObject(with: data!, options: .allowFragments) as! [String: Any]
print(json)
if let countries = json["country"] as? [[String: AnyObject]] {
for country in countries {
print("Country Name: \(String(describing: country["name"]))")
print("Country Code: \(String(describing: country["code"]))")
if let couname = country["name"] as? [AnyObject] {
print(couname)
}
if let coucode = country["code"] as? [AnyObject] {
print(coucode)
}
}
}
} catch {
print("Error Serializing JSON: \(error)")
}
}
//executing the task
task.resume()
}
+3
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1 answer
You need to expand the option before trying to use it using string interpolation. The safest way to do this is through optional binding:
Please use below code that will work for you.
if let countries = json["country"] as? [[String: AnyObject]] {
for country in countries {
print("Country Name: \(country["name"] as! String)")
print("Country Code: \(country["code"] as! String)")
if let couname = country["name"] as? String {
print(couname)
}
if let coucode = country["code"] as? Int {
print(coucode)
}
}
}
+3
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