我尝试在NSUserDefaults
中存储对象数组。
我有以下代码片段:
var accounts = MyAccounts()
var array:Array<MyAccounts.MyCalendar> = accounts.populateFromCalendars()
NSUserDefaults.standardUserDefaults().
setObject(array, forKey: "test_storeAccounts_array") // <- get error here
NSUserDefaults.standardUserDefaults().synchronize()
但是我得到了例外:
does not implement methodSignatureForSelector: -- trouble ahead
我的班级结构:
class MyAccounts {
/* ... */
class MyCalendar {
var title:String?
var identifier:String?
var email:String?
var calType:String?
var isActive:Bool?
var isMainAcount:Bool?
init(){}
}
}
有什么想法吗?
答案 0 :(得分:76)
确保您的类继承自NSObject
class MyAccounts:NSObject {
/* ... */
class MyCalendar {
var title:String?
var identifier:String?
var email:String?
var calType:String?
var isActive:Bool?
var isMainAcount:Bool?
init(){}
}
}
答案 1 :(得分:16)
我在Swift 3.0中遇到了这个异常。在我的例子中,我的模型类不是从NSObject基类继承的。只是从NSObject基类继承我的类并实现NSCoding协议(如果你的容器数组有自定义对象)
class Stock: NSObject, NSCoding {
var stockName: String?
override init() {
}
//MARK: NSCoding protocol methods
func encode(with aCoder: NSCoder){
aCoder.encode(self.stockName, forKey: "name")
}
required init(coder decoder: NSCoder) {
if let name = decoder.decodeObject(forKey: "name") as? String{
self.stockName = name
}
}
func getStockDataFromDict(stockDict stockDict:[String:AnyObject]) -> Stock {
if let stockName = stockDict["name"] {
self.stockName = stockName as? String
}
return self
}
}
答案 2 :(得分:1)
在Swift 2中,我在自定义类中使用通知模式时遇到了类似的错误。请注意,当在ViewController类中实现相同的通知(Observe)时,它不会抱怨。它只有自定义类,从Swift文件创建而没有子类化这个错误被抛出
class myClass : NSObject {
override init(){
super.init()
NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector("functionCall:"), name: "NotificationName", object: nil)
}
//Implement function
func functionCall(notification: NSNotification) {
//Extract the object and implement the function
}
}
答案 3 :(得分:0)
您需要先将类转换为NSData
。像这样:
var data = NSKeyedArchiver.archivedDataWithRootObject(accounts.populateFromCalendars())
var userDefaults = NSUserDefaults.standardUserDefaults();
userDefaults.setObject(data, forKey: "test_storeAccounts_array");