Question

我在手机上部署应用时遇到“模糊使用下标”错误。

我有以下格式的JSON响应：

[
    { 
        "title":"G1",
        …
    },
    {
        "title":"G2”,
        …
    }
]

这是我的代码：

let task = URLSession.shared.dataTask(with: url) { (data, response, error) in // URLSession.shared().dataTask(with: url) { (data, response, error) is now URLSession.shared.dataTask(with: url) { (data, response, error)

        if error != nil {

            print(error)

        } else {

            if let urlContent = data {

                do {

                    let jsonResult = try JSONSerialization.jsonObject(with: urlContent, options: JSONSerialization.ReadingOptions.mutableContainers) as AnyObject


                    for index in 0...jsonResult.count-1 {

                        if let item = jsonResult[index] as? [String: AnyObject] {
                            if let loc = item["title"] as? String {
                                self.locArr.append(loc)
                            }
                        }
                    }
                    DispatchQueue.main.async {
                        self.tableView.reloadData()
                    }

                } catch {

                    print("JSON Processing Failed")
                }
            }
        }
    }

    task.resume()

我的错误发生在以下一行：

if let item = jsonResult[index] as? [String: AnyObject] {

当我第一次与json合作时，请有人帮助我。我不确定我的代码结构是否支持上面的json模式。任何帮助将不胜感激。

Answer 1

let jsonResult = try JSONSerialization.jsonObject(with: urlContent, options: JSONSerialization.ReadingOptions.mutableContainers) as AnyObject

您应该将jsonResult转换为AnyObject数组

guard let jsonResult = try JSONSerialization.jsonObject(with: urlContent, options: JSONSerialization.ReadingOptions.mutableContainers) as? [AnyObject] else {
  return
}

部署时“模糊使用下标”错误 - Swift 3

1 个答案: