迅速從字典中檢索字典數組

Question

我有一個json響應，除其他外，其中包含一個字典數組。 我希望能夠將該陣列復制到現有陣列中。

我在Objective-C中做到的方式是這樣的：

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);
    });

迅速必須是這樣的：

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);
            });

但這給了我以下錯誤：

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

任何幫助，將不勝感激！

Answer 1

問題出在您聲明AnyObject[] ：錯誤（“ AnyObject”不可轉換為“ AnyObject []” ）清楚地表明，沒有數組初始化。

如果初始化程序應為Array值，然后用於AnyObject[] ，請首先檢查響應值。

更換：

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

至

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