Weird results with parsing array from json in Swift3 - arrays

Question

Hi guys I don't know why the array Places returns weird values like 0x6080004b3aa0 instead of displaying my title, coordinate and subtitle out of my JSON url. Thanks for your Help!
import MapKit
#objc class Place: NSObject {
var title: String?
var coordinate: CLLocationCoordinate2D
var subtitle: String?
init(title:String,subtitle:String, coordinate:CLLocationCoordinate2D){
self.title = title
self.coordinate = coordinate
self.subtitle = subtitle
}
static func getPlaces() -> [Place] {
guard let url = NSURL(string: "https://script.googleusercontent.com/macros/echo?user_content_key=Z-LfTMdhgAg_6SRd-iMucSyWu-LFBQO8MLxJZ6DPcL05Rtr3joCCypWD2l46qaegSpVpVINc1DLl5inoDOgGx3p3ANpY1AkGOJmA1Yb3SEsKFZqtv3DaNYcMrmhZHmUMWojr9NvTBuBLhyHCd5hHa1ZsYSbt7G4nMhEEDL32U4DxjO7V7yvmJPXJTBuCiTGh3rUPjpYM_V0PJJG7TIaKp4bydEiKBUZP6fpOyGJIhkmEGneM7ZIlWloTVbXmkjs15vHn8T7HCelqi-5f3gf3-sKiW3k6MDkf31SIMZH6H4k&lib=MbpKbbfePtAVndrs259dhPT7ROjQYJ8yx") else { return [] }
let request = NSMutableURLRequest(url: url as URL!)
var places = [Place]()
let task = URLSession.shared.dataTask(with: request as URLRequest) {data,response,error in
guard error == nil && data != nil else {
print ("Error:",error)
return
}
let httpStatus = response as? HTTPURLResponse
if httpStatus?.statusCode == 200
{ if data?.count != 0
{
let responseString = try! JSONSerialization.jsonObject(with: data!, options: .allowFragments) as! NSDictionary
let contacts = responseString["Sheet1"] as? [AnyObject]
for contact in contacts!{
var places = [Place]()
let title = contact["name"] as! String
let subtitle = contact["description"] as? String
let latitude = contact["latitude"] as? Double ?? 0, longitude = contact["longitude"] as? Double ?? 0
let place = Place(title:title,subtitle:subtitle!,coordinate: CLLocationCoordinate2DMake(latitude, longitude))
places.append(place)
print(latitude)
print(place)
}
}
else {
print("No data got from url")
}
} else {
print("error httpsatus code is:", httpStatus!.statusCode)
}
}
task.resume()
return places as [Place]
}
}
I think the problem is this:
let place = Place(title:title,subtitle:subtitle!,coordinate: CLLocationCoordinate2DMake(latitude, longitude))
When I print(place) it returns the weird results

Answer 1

When you make a class that subclasses from NSObject you're creating a object that is backed by an Objective-c class -- which in some circumstances can be really useful (most common use is when you want to take your object and archive it as a blob of binary data).
I'm guessing that in your case, you probably don't want/need to subclass NSObject.
Here's a simplified example to show what's happening:
Here's a class backed by NSObject:
#objc class ObjCPlace: NSObject {
let name: String
init(name: String) {
self.name = name
}
}
If you create an instance of this object and try to print contents - like you've found, you get the objects location in memory:
let testObjcPlace = ObjCPlace(name: "New York")
print(testObjcPlace)
// prints:
// <__lldb_expr_310.ObjCPlace: 0x600000055060>
On alternative to using print could be to use dump that provides a more detailed look at your object:
let testObjcPlace = ObjCPlace(name: "New York")
dump(testObjcPlace)
// Prints:
// ▿ <__lldb_expr_310.ObjCPlace: 0x600000055060> #0
// - super: NSObject
// - name: "New York"
But instead of making an NSObject subclass, you probably just want to make a Swift class (or in this example a struct take a look at this question and answers for explanations of the differences)
struct Place {
let name: String
init(name: String) {
self.name = name
}
}
Because this object isn't an Objective-c object you can use print and get the internal properties printed as well:
let testPlace = Place(name: "New York")
print(testPlace)
// Prints:
// Place(name: "New York")
p/s welcome to StackOverflow!