How can I use NSArray and NSDictionary with this SQL data? - sql

Question

Couldn't parse JSON data.
Could not cast value of type '__NSArrayI' (0x10f02fc08) to 'NSMutableArray' (0x10f02fcd0).
JSON data here and code here;
echo json_encode($resultArray);
And here is my trial code;
func parseJSON() {
var jsonResult: NSMutableArray = NSMutableArray()
do{
jsonResult = try JSONSerialization.jsonObject(with: self.data as Data, options:JSONSerialization.ReadingOptions.allowFragments) as! NSMutableArray
} catch let error as NSError {
print(error)
}
var jsonElement: NSDictionary = NSDictionary()
let locations: NSMutableArray = NSMutableArray()
for i in 1...jsonResult.count
{
jsonElement = jsonResult[i-1] as! NSDictionary
let location = LocationModel()
if let name = jsonElement["Name"] as? String,
let address = jsonElement["Address"] as? String,
let latitude = jsonElement["Latitude"] as? String,
let longitude = jsonElement["Longitude"] as? String
{
location.name = name
location.address = address
location.latitude = latitude
location.longitude = longitude
}
locations.add(location)
}
DispatchQueue.main.async(execute: { () -> Void in
self.delegate.itemsDownloaded(items: locations)
})
}

Answer 1

NOTE: IT WILL FIX THIS
instead of:
var jsonResult: NSMutableArray = NSMutableArray()
do this:
var jsonResult: NSArray = NSArray()
and instead of:
jsonResult = try JSONSerialization.jsonObject(with: self.data as Data, options:JSONSerialization.ReadingOptions.allowFragments) as! NSMutableArray
do this:
jsonResult = try JSONSerialization.jsonObject(with: self.data as Data, options:JSONSerialization.ReadingOptions.allowFragments) as! NSArray
full code:
func parseJSON() {
var jsonResult: NSArray = NSArray()
do{
jsonResult = try JSONSerialization.jsonObject(with: self.data as Data, options:JSONSerialization.ReadingOptions.allowFragments) as! NSArray
} catch let error as NSError {
print(error)
}
var jsonElement: NSDictionary = NSDictionary()
let locations: NSMutableArray = NSMutableArray()
for i in 1...jsonResult.count
{
jsonElement = jsonResult[i-1] as! NSDictionary
let location = LocationModel()
if let name = jsonElement["Name"] as? String,
let address = jsonElement["Address"] as? String,
let latitude = jsonElement["Latitude"] as? String,
let longitude = jsonElement["Longitude"] as? String
{
location.name = name
location.address = address
location.latitude = latitude
location.longitude = longitude
}
locations.add(location)
}
DispatchQueue.main.async(execute: { () -> Void in
self.delegate.itemsDownloaded(items: locations)
})
}

Answer 2

The issue is that JSONSerialization is returning a non-mutable array, and you can't just cast a NSArray to a NSMutableArray. Instead, just declare it to be NSArray:
func parseJSON() {
var jsonResult: NSArray
do {
jsonResult = try JSONSerialization.jsonObject(with: data as Data) as! NSArray
} catch let error as NSError {
print(error)
return
}
...
}
Or, alternatively, use Swift's native collection types rather than falling back on old NSArray and NSDictionary types:
func parseJSON() {
var jsonResult: [[String: Any]] // this is an array of dictionaries
do {
jsonResult = try JSONSerialization.jsonObject(with: data as Data) as! [[String: Any]]
} catch let error as NSError {
print(error)
return
}
for jsonElement in jsonResult {
if let name = jsonElement["Name"] as? String,
let address = jsonElement["Address"] as? String,
let latitude = jsonElement["Latitude"] as? String,
let longitude = jsonElement["Longitude"] as? String
{
let location = LocationModel()
location.name = name
location.address = address
location.latitude = latitude
location.longitude = longitude
locations.add(location) // or, if you defined `locations` to be a Swift array, `locations.append(location)`
}
}
...
}
(Personally, I'd probably also define the data to be a Data rather than a NSData and define locations to be [LocationModel] rather than NSMutableArray.)