How to iterate array of dictionaries having nested dictionary? - ios

Question

I have JSON
http://maps.googleapis.com/maps/api/directions/json?&origin=28.594517,77.049112&destination=28.654109,77.34395&travelMode=DRIVING&provideRouteAlternatives=false&sensor=false
I want to access all the values in distance which is in steps.
Here is my code
class Router {
var getValue = Double()
func downloadData(complete: downloadComplete) {
let currentURL = URL(string:getURL)!
Alamofire.request(currentURL).responseJSON { (responseJSON) in
let result = responseJSON
// print(result)
if let dict = result.value as? Dictionary<String,AnyObject>{
if let routes = dict["routes"] as? [Dictionary<String, AnyObject>]{
if let legs = routes[0]["legs"] as? [Dictionary<String, AnyObject>]{
if let steps = legs[0]["steps"] as? [Dictionary<String, AnyObject>]{
for index in steps{
if let distance = steps["distance"] as? Dictionary<String,AnyObject>{
if let value = distance["value"] as? Double{
self.getValue = self.getValue + value
print(self.getValue)
}
}
}
}
}
}
}
}
complete()
}
I am getting error in:
if let distance = steps["distance"] as? Dictionary<String,AnyObject>{
which says:
Cannot subscript a value of type '[Dictionary]' with an index of type string
How can I access this?

Answer 1

You are trying to access the value of an array of dictionaries by key. You should change steps["distance"] to index["distance"].
if let distance = index["distance"] as? Dictionary<String,AnyObject>{
if let value = distance["value"] as? Double{
self.getValue = self.getValue + value
print(self.getValue)
}
}

Answer 2

The error is clear.
steps["distance"] is an array of dictionaries, which can be accessed like steps[0],steps[1].
You need to change following line
if let distance = steps["distance"] as? Dictionary<String,AnyObject>
to
if let distance = index["distance"] as? Dictionary<String,AnyObject>