在 swift 中从 Facebook 图 Api 请求访问设备数据

Question

我在 swift 的 iphone 应用程序中使用 FBSDK 发出了图形请求，但我在访问它在结果中返回的一些信息时遇到了一些困难。具体来说，我想获取用户使用的设备平台列表。玩弄 Graph api 资源管理器，我获得了用于在用户设备上进行查询的数据。

{
  "devices": [
    {
      "os": "iOS"
    }
  ], 
  "id": "12345678912345"
}

但在 swift 中，当我将图形结果值打印到控制台时，返回的数据采用这种格式：

{
    devices =     (
                    {
                os = iOS;
            }
        );
}

所以我的问题是，如何在 swift 中获取 'os' 的值？我所有将数据投射到 NSDictionaries 和 NSArrays 等的尝试都失败了。

let listOfDevices: String = result.valueForKey("devices") as? String

输出

devices =     (
                        {
                    os = iOS;
                }
            );

这只是表明当我搜索 ["os"] 时它不包含 NSDictionary 的任何 key/pair 值，因为那些“()”括号。所有帮助表示赞赏。可能真的很简单...

我不想使用字符串正则表达式。

Answer 1

listOfDevices 应该是字典。

Swift 2

do {
    // Replicating your data for the example
    let response = "{\"devices\": [{\"os\": \"iOS\"}],\"id\": \"12345678912345\"}"
    // Cast the response as a Dictionary with String as key and AnyObject as value
    if let data = response.dataUsingEncoding(NSUTF8StringEncoding),
        listOfDevices = try NSJSONSerialization.JSONObjectWithData(data, options: []) as? [String:AnyObject] {
        // Value of `devices` is an array of dictionaries
        if let devices = listOfDevices["devices"] as? [[String:AnyObject]] {
            for device in devices {
                if let os = device["os"] as? String {
                    print(os)
                }
            }
        }
        // Value of `id` is a String
        if let id = listOfDevices["id"] as? String {
            // use `id`
        }
    }
} catch let error as NSError {
    print(error.localizedDescription)
}

Swift 1

// Replicating your data for the example
let response = "{\"devices\": [{\"os\": \"iOS\"}],\"id\": \"12345678912345\"}"
let data = response.dataUsingEncoding(NSUTF8StringEncoding)

// Cast the response as a Dictionary with String as key and AnyObject as value
let listOfDevices = NSJSONSerialization.JSONObjectWithData(data!, options: NSJSONReadingOptions.MutableContainers, error: nil) as! [String:AnyObject]

// Value of `devices` is an array of dictionaries
if let devices = listOfDevices["devices"] as? [[String:AnyObject]] {
    for device in devices {
        if let os = device["os"] as? String {
            println(os)
        }
    }
}

// Value of `id` is a String
if let id = listOfDevices["id"] as? String {
    // use `id`
}

在 swift 中从 Facebook 图 Api 请求访问设备数据

Accessing devices data from Facebook graph Api request in swift

facebook-graph-api

ios

swift