迅速从字典中检索字典数组

Question

我有一个json响应，除其他外，其中包含一个字典数组。 我希望能够将该阵列复制到现有阵列中。

我在Objective-C中做到的方式是这样的：

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);
    });

迅速必须是这样的：

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);
            });

但这给了我以下错误：

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

任何帮助，将不胜感激！

Answer 1

问题出在您声明AnyObject[] ：错误（“ AnyObject”不可转换为“ AnyObject []” ）清楚地表明，没有数组初始化。

如果初始化程序应为Array值，然后用于AnyObject[] ，请首先检查响应值。

更换：

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

至

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