Ambiguous Use of Subscript (Swift 3)

Ambiguous Use of Subscript in Swift

The problem is that you are using NSArray:

myQuestionsArray = NSArray(contentsOfFile: path)

This means that myQuestionArray is an NSArray. But an NSArray has no type information about its elements. Thus, when you get to this line:

let currentQuestionDict = myQuestionsArray!.objectAtIndex(count)

...Swift has no type information, and has to make currentQuestionDict an AnyObject. But you can't subscript an AnyObject, so expressions like currentQuestionDict["choice1"] cannot compile.

The solution is to use Swift types. If you know what currentQuestionDict really is, type it as that type. At the very least, since you seem to believe it is a dictionary, make it one; type it as [NSObject:AnyObject] (and more specific if possible). You can do this in several ways; one way is by casting when you create the variable:

let currentQuestionDict = 
    myQuestionsArray!.objectAtIndex(count) as! [NSObject:AnyObject]

In short, never use NSArray and NSDictionary if you can avoid it (and you can usually avoid it). If you receive one from Objective-C, type it as what it really is, so that Swift can work with it.

Ambiguous use of 'subscript' Swift 3 compile error

First of all the JSON dictionary type in Swift 3 is [String:Any].

The ambiguous use reason is that the compiler doesn't know the type of allContacts["data"]. It's obviously an array but you need to tell the compiler. And please don't use the ugly C-style index based for loops in Swift at all. If you need index and object in a repeat loop use enumerated().

if let arrJSON = allContacts["data"] as? [[String : Any]] {
   for aObject in arrJSON {
       if ChooseSubject.mineFagKoder.contains(aObject["subject"] as! String) { ...

Ambiguous Use of Subscript in Swift?

let newObject = arr[indexPath.section] as? [AnyObject] 

and then use your code as

let newProductDic = newObject[indexPath.row] 

Ambiguous use of 'subscript(_:)'

A JSON object is never unspecified AnyObject. If you expect a dictionary cast it to dictionary

let myJson = try JSONSerialization.jsonObject(with: content) as! [String:Any]

This fixes the error because the compiler now knows the real type.

And never specify .mutableContainers. The option has no effect in Swift

Ambiguous Use of Subscript (Swift 3)

My preferred way of dealing with data is to unwrap the FIRDataSnapshot as late as possible.

ref!.observe(.value, with: { (snapshot) in
    for child in snapshot.children {
        let msg = child as! FIRDataSnapshot
        print("\(msg.key): \(msg.value!)")
        let val = msg.value! as! [String:Any]
        print("\(val["name"]!): \(val["message"]!)")
    }
})

Swift 3 Ambiguous Use of Subscript

You need to specify the type of your variable alert. The problem is that it cannot apply subscript to type AnyObject

Subscripts in Swift 3

Classes, structures, and enumerations can define subscripts, which are shortcuts for accessing the member elements of a collection, list, or sequence. You use subscripts to set and retrieve values by index without needing separate methods for setting and retrieval. For example, you access elements in an Array instance as someArray[index] and elements in a Dictionary instance as someDictionary[key].

Error message = Ambiguous use of 'subscript(_:)' Found this candidate Problem of casting Array of Dictionary

You've defined models as [AnyObject] i.e. an array of AnyObject. So model is an instance of AnyObject and the compiler wouldn't be able to infer what it is and thus it can't be subscripted without a more specific type.

Should work if you use a new variable with type [[String: Any]].

[Dictionary<String,Any>] is equivalent, but to me the shorter syntax is more readable.

Ambiguous use of 'subscript' in swift 3 using xcode 8

if let tracks = readableJSON["tracks"] as? JSONStandard
{
  if let items = tracks["items"] as? NSArray
  {
     for i in 0..<items.count
     {
        let item = items[i] as? JSONStandard
        let name = item?["name"] as! String
        names.append(name)
        self.tableView.reloadData()
     }               
   }
}

I got my answer with line
if let items = tracks["items"] as? NSArray instead of if let items = tracks["items"]

Here Simulator takes types itself and for device we have to specify data type as i have writtern as? NSArray for items

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