Swift [String：AnyObject]无法转换为T Swift数组

Question

I am working inside a Swift Extension. I am trying to append data to an array of the type [[String: AnyObject]] . The reason that this is in an extension is because I have to do this lot's of times to lot's of arrays. The problem is, when I append an object of type: [String: AnyObject] , I get the error: Dictionary'<'String, AnyObject'>' Not Convertible to T (the quotes are there because within the carrots nothing showed up).

mutating func appendData(data: [String: [String: AnyObject]]?) {
    if data != nil {
        for (id, object) in data! {
            var mutatingObject = object
            mutatingObject["id"] = id
            append(mutatingObject)
        }
    }
}

Answer 1

I am not certain what exactly are you trying to achieve. but take a note - Arrays are generic collections that store specific type. Extension for Array might not know what type will be used in each case, so it cannot simply allow you to store Dictionary<String, AnyObject> .

Here is an example on how to make your code more generic:

extension Array {
    mutating func appendData(data: [String: T]?) {
        if data != nil {
            for (id, object) in data! {
                if var mutatingObject = object as? [String : AnyObject] {
                    mutatingObject["id"] = id
                }

                append(object)
            }
        }
    }
}