迅速从字典中检索字典数组

Question

I have a json response, which among other things contains an array of dictionaries. I want to be able to copy that array in to an existing array.

The way I did it in objective-C was like this:

dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
    dispatch_async(queue, ^{
        NSError *error = nil;
        NSDictionary *responseDictionary = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];
        NSArray *venuesArray = responseDictionary[@"response"][@"venues"];

        completion(venuesArray, error);
    });

In swift it has to be something like this:

dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), {
                var error: NSError?
                let responseDictionary: Dictionary<String, AnyObject> = NSJSONSerialization.JSONObjectWithData(data, options: nil, error: &error) as Dictionary
                let venuesArray : AnyObject[] = (responseDictionary as AnyObject).valueForKeyPath("response.venues")
                completionClosure(venues: responseDictionary, error: error);
            });

But this gives me the following error:

'AnyObject' is not convertible to 'AnyObject[] '

Any help would be appreciated!

Answer 1

The problem is with you declaration of AnyObject[] : The error(' AnyObject' is not convertible to 'AnyObject[]' ) clearly states that, there is no array initialisation.

if The initialiser should be the Array values then use for AnyObject[] , check the responses value first.

Replace:

let venuesArray : AnyObject[] = (responseDictionary as AnyObject).valueForKeyPath("response.venues")

To

let venuesArray : AnyObject = (responseDictionary as AnyObject).valueForKeyPath("response.venues")