如何快速返回函数中的对象的自定义数组

Question

我无法快速从函数返回自定义对象数组。我总是收到[(custon object)] is not convertable to '()'错误消息。我认为我违反了某些快速协议。下面是我的代码。请让我知道我违反了哪个。

import Foundation

class DataSet {
    var settings:Settings!
    var service:PostService!
    var currentBrand:Brand!

    init(){
        self.settings = Settings()
        self.service = PostService()
    }

    func loadComments(id:Int) -> [CommentsList]{
        service.apiCallToGet(settings.getComments(id), {
            (response) in
            var commentsList = [CommentsList]()
            if let data = response["data"] as? NSDictionary {
                if let comments = data["comments"] as? NSArray{
                    for item in comments {
                        if let comment = item as? NSDictionary{
                            var rating = comment["rating"]! as Int
                            var name = comment["device"]!["username"]! as NSString
                            var text = comment["text"]! as NSString
                            var Obj_comment = CommentsList(rating: rating, name: name, text: text)
                            commentsList.append(Obj_comment)
                        }
                    }
                }
            }

            return commentsList //This line shows error as :  "[(CommentsList)] is not convertable to '()'"
        })
    }
}

Answer 1

您的return语句位于Web服务的完成块内，该块不返回任何内容()-这就是错误的含义。

围绕异步Web调用包装的方法无法返回值，因为您必须阻塞直到Web调用完成。您的loadComments方法应采用一个完成块参数，该参数应[CommentsList]作为参数：

func loadComments(id: Int, completion:(comments:[CommentsList])->Void) {
    // existing code

然后，将您的return语句替换为

completion(comments:commentsList)