Swift 2 to Swift 3 migration: Ambiguous reference to member 'subscript' - ios

Question

I had a block of code parsing JSON from the youtube API. The JSON object received is stored in the dictionary and then a sub array of JSON objects items is stored in item. Xcode is giving me an error where it says: "items" is an ambiguous reference to member subscript for JSON and i for item[i].
I read through some posts on stack-overflow addressing similar issues where it said Swift 3 changed the type to [String: AnyObject] but that didn't work for me either.
do
{
let json = try JSONSerialization.jsonObject(with: data!, options: .mutableContainers) as! Dictionary<NSObject, AnyObject>
//print(json)
let item: Array<Dictionary<NSObject,AnyObject>> = json["items"] as! Array<Dictionary<NSObject,AnyObject>>
for i in 0 ..< item.count
{
let snippetDict = (item[i] as Dictionary<NSObject, AnyObject>)["snippet"] as! Dictionary<NSObject, AnyObject>
// Initialize a new dictionary and store the data of interest.
var desiredVideoDict = Dictionary<NSObject, AnyObject>()
desiredVideoDict["title"] = snippetDict["title"]
desiredVideoDict["thumbnail"] = ((snippetDict["thumbnails"] as! Dictionary<NSObject, AnyObject>)["default"] as! Dictionary<NSObject, AnyObject>)["url"]
desiredVideoDict["videoID"] = (snippetDict["resourceId"] as! Dictionary<NSObject, AnyObject>)["videoId"]
// Append the desiredPlaylistItemDataDict dictionary to the videos array.
//self.videosArray.append(desiredPlaylistItemDataDict)
// Reload the tableview.
self.tblVideos.reloadData()
Thank you for your time and help.

Answer 1

The standard JSON dictionary has the type [String:Any] in Swift 3.
I recommend to use a type alias for better legibility.
typealias JSONObject = [String:Any]
Now you can write your code this way (I changed also the for loop syntax)
do
{
let json = try JSONSerialization.jsonObject(with: data!, options: []) as! JSONObject
//print(json)
let items = json["items"] as! Array<JSONObject>
for item in items
{
let snippetDict = item["snippet"] as! JSONObject
// Initialize a new dictionary and store the data of interest.
var desiredVideoDict = JSONObject()
desiredVideoDict["title"] = snippetDict["title"]
desiredVideoDict["thumbnail"] = ((snippetDict["thumbnails"] as! JSONObject)["default"] as! JSONObject)["url"]
desiredVideoDict["videoID"] = (snippetDict["resourceId"] as! JSONObject)["videoId"]
// Append the desiredPlaylistItemDataDict dictionary to the videos array.
//self.videosArray.append(desiredPlaylistItemDataDict)
// Reload the tableview.
}
self.tblVideos.reloadData()
...
mutableContainers is not needed at all.

Answer 2

This worked for me:
do
{
let json = try JSONSerialization.jsonObject(with: data , options: .mutableContainers) as! Dictionary<String, AnyObject>
//print(json)
let item = json["items"] as! Array<Dictionary<String,AnyObject>>
for i in 0 ..< item.count
{
let snippetDict = item[i]["snippet"] as! Dictionary<String, AnyObject>
// Initialize a new dictionary and store the data of interest.
var desiredVideoDict = Dictionary<String, AnyObject>()
desiredVideoDict["title"] = snippetDict["title"]
desiredVideoDict["thumbnail"] = ((snippetDict["thumbnails"] as! Dictionary<String, AnyObject>)["default"] as! Dictionary<String, AnyObject>)["url"]
desiredVideoDict["videoID"] = (snippetDict["resourceId"] as! Dictionary<String, AnyObject>)["videoId"]
// Reload the tableview.
self.tblVideos.reloadData()
}
}catch{
print("parse error")
}