使用 Flickr API 时出现 Alamofire AFError

Question

我正在使用 Alamofire 从 flickr API 获取 JSON 数据。 这里的 if 函数，它从响应中准备一个 URL 数组：

func urlTolinkslist (tag: String) {
    print (viewSearchBar.text)
    let url = "https://api.flickr.com/services/feeds/photos_public.gne?tags=\(tag.replacingOccurrences(of: " ", with: "%20"))&format=json&nojsoncallback=1"
    Alamofire.request(url).validate().responseJSON { response in
        switch response.result {
        case .success(let value): 
            let json = JSON(value)
            let items = json["items"]
            self.linksList = []
            for i in 0..<items.count {
                let item = items[i]
                let media = item["media"]
                var link = String(describing: media["m"])
                self.linksList.append(link)
            }
            print("count: \(self.linksList.count)")
            self.viewCollectionView.reloadData()
        case .failure(let error):
            print(error)
        }
    }
}

API URL 中的“tag”是我从搜索栏中获得的参数。在大多数情况下它工作正常，但在某些情况下我得到：

[Result]: FAILURE: responseSerializationFailed(Alamofire.AFError.ResponseSerializationFailureReason.jsonSerializationFailed(Error Domain=NSCocoaErrorDomain Code=3840 "Invalid escape sequence around character 1029." UserInfo={NSDebugDescription=Invalid escape sequence around character 1029.}))

我认为可能有一些额外的字符，但我不知道如何修复它。

Answer 1

让 Alamofire 为您编码参数：

func urlTolinkslist (tag: String) {
    let url = "https://api.flickr.com/services/feeds/photos_public.gne"
    var dict = [String:AnyObject]()
    dict["tags"] = tag
    dict["format"] = "json"
    dict["nojsoncallback"] = 1
    Alamofire.request(.GET, url, parameters: dict, encoding: .URLEncodedInURL, headers: nil).validate().responseJSON { response in
        switch response.result {
        case .success(let value):
            let json = JSON(value)
            let items = json["items"]
            self.linksList = []
            for i in 0..<items.count {
                let item = items[i]
                let media = item["media"]
                var link = String(describing: media["m"])
                self.linksList.append(link)
            }
            print("count: \(self.linksList.count)")
            self.viewCollectionView.reloadData()
        case .failure(let error):
            print(error)
        }
    }
}