Swift NSUserDefaults setObject 用于数组

Question

我需要使用 NSUserDefaults 保存从 jSON 获得的数组，问题是它只保存第一个字符串而不是所有数组。因此，如果数组像 NewYork,London,Rome .. 它只保存 NewYork。我将它用于选择器视图。 这是代码：

编辑 从 JSON 中保存数组：

   if let jsonData = NSJSONSerialization.JSONObjectWithData(urlData!, options: nil, error: &error) as? [String:AnyObject] { // dictionary
                if let locationsArray = jsonData["locations"] as? [[String:AnyObject]] { // array of dictionaries
                    for locationDictionary in locationsArray { // we loop in the array of dictionaries
                        if let location = locationDictionary["location_name"] as? String { // finally, access the dictionary like you were trying to do
                           // println(location)

                            var locationSave: Void = save.setObject(location, forKey: "Location")




                        }
                    }
                }
            }



        }

请求数组：

  var Location = save.objectForKey("Location")!

        var pickerviewFields = Location

   return pickerviewFields.count

提前致谢！

Answer 1

你只能保存一个 NSArray，如果 Array 是一个 Swift Array，你需要转换它。另外，NSArray 和 NSDictionary 对象，它们的内容必须是属性列表对象。

以下是转换数组的方法：

var MyArray = ["a", "b", "c"]
var MyNSArray: NSArray

MyNSArray = MyArray as NSArray

println("\(MyNSArray)")

打印：(a,b,c)

我有一个带有一些示例 JSON 的小示例：

    var myJSONString: NSString = "{ \"locations\" : [ { \"location_name\" : \"A\" }, { \"location_name\" : \"B\" }, { \"location_name\" : \"C\" }, { \"location_name\" : \"D\" } ] }"
    var urlData: NSData? = NSData()
    var error: NSError?
    var save = NSUserDefaults.standardUserDefaults()

    urlData = myJSONString.dataUsingEncoding(NSUTF8StringEncoding)

    if let jsonData = NSJSONSerialization.JSONObjectWithData(urlData!, options: nil, error: &error) as? NSDictionary { // dictionary
        if let locationsArray = jsonData["locations"] as? NSArray { // array of dictionaries
            for locationDictionary in locationsArray { // we loop in the array of dictionaries
                if let location = locationDictionary["location_name"] as? NSString { 
                    println(location)
                }
            }
            NSUserDefaults.standardUserDefaults().setObject(locationsArray, forKey: "locationArray")
        }
    }

    println(save.dictionaryRepresentation())

Answer 2

你可以试试这个：

写作

let locationArray = ["London", "NewYork", "Rome"]
let locationData = NSKeyedArchiver.archivedDataWithRootObject(locationArray)
NSUserDefaults.standardUserDefaults().setObject(locationData, forKey: "Location")
NSUserDefaults.standardUserDefaults().synchronize()

阅读

let locationData = NSUserDefaults.standardUserDefaults().objectForKey("Location") as? NSData
if let locationData = locationData {
    let locationArray = NSKeyedUnarchiver.unarchiveObjectWithData(locationData) as? [String]

    if let locationArray = locationArray {
        println(locationArray)
    }
}