Ios 在NSUserDefaults中存储自定义对象时,应用程序崩溃
我有一个名为Ios 在NSUserDefaults中存储自定义对象时,应用程序崩溃,ios,xcode,swift,Ios,Xcode,Swift,我有一个名为User的自定义类,它符合NSCoding协议。但当我试图将其存储在NSUserDefaults中时,会出现以下错误: Property list invalid for format: 200 (property lists cannot contain objects of type 'CFType') 这一警告: NSForwarding: warning: object 0x7f816a681110 of class 'Shikimori.User' does not i
User
的自定义类,它符合NSCoding协议。但当我试图将其存储在NSUserDefaults中时,会出现以下错误:
Property list invalid for format: 200
(property lists cannot contain objects of type 'CFType')
这一警告:
NSForwarding: warning: object 0x7f816a681110 of class 'Shikimori.User'
does not implement methodSignatureForSelector: -- trouble ahead
Unrecognized selector -[Shikimori.User _copyDescription]
用户
类别:
class User: NSCoding {
private enum CoderKeys: String {
case ID = "user.id"
case Username = "user.username"
case Email = "user.email"
case Avatar = "user.avatar"
}
let id: Int
let username: String
let email: String
let avatar: String
init(id: Int, username: String, email: String, avatar: String) {
self.id = id
self.username = username
self.email = email
self.avatar = avatar
}
required init(coder aDecoder: NSCoder) {
id = aDecoder.decodeIntegerForKey(CoderKeys.ID.rawValue)
username = aDecoder.decodeObjectForKey(CoderKeys.Username.rawValue) as String
email = aDecoder.decodeObjectForKey(CoderKeys.Email.rawValue) as String
avatar = aDecoder.decodeObjectForKey(CoderKeys.Avatar.rawValue) as String
}
func encodeWithCoder(aCoder: NSCoder) {
aCoder.encodeInteger(id, forKey: CoderKeys.ID.rawValue)
aCoder.encodeObject(username as NSString, forKey: CoderKeys.Username.rawValue)
aCoder.encodeObject(email as NSString, forKey: CoderKeys.Email.rawValue)
aCoder.encodeObject(avatar as NSString, forKey: CoderKeys.Avatar.rawValue)
}
}
更新
保存代码:
let userKeyForDefaults = "apimanager.user"
let defaults = NSUserDefaults.standardUserDefaults()
defaults.setObject(user, forKey: self.userKeyForDefaults)
nsserdefaults
不支持所有对象,只支持NSString
、NSDictionary
,最重要的是,NSData
。这就是NSCoding
协议派上用场的地方。它允许我们将自定义对象转换为NSData
块。为此,请使用NSKeyedArchiver
类将符合NSCoding
的自定义对象转换为等效的NSData
let obj = User()
let data = NSKeyedArchiver. archivedDataWithRootObject(obj)
/// Now you can store data
可以找到文档,并且您正在寻找的方法是
class func archivedDataWithRootObject(_ rootObject: AnyObject) -> NSData
要从NSUserDefaults
中获取信息,请使用“反向”类nskeyedunachiver
。其适当的方法如下
class func unarchiveObjectWithData(_ data: NSData) -> AnyObject?
这是一个样本
let data = NSUserDefaults.standardUserDefaults().objectForKey("somekey")
let obj = NSKeyedUnarchiver. unarchiveObjectWithData(data) as User?
注意:我可能混淆了一些选项,但是你得到了jist。可以找到NSKeyedUnarchiver
的文档
编辑:修复OP的问题非常简单,只需正确使用
NSKeyedArchiver
和子类化NSObject
您无法将自定义对象存储到NSUserDefaults@vivek,即使它符合NSCoding?我还没有尝试过,但也许您的类必须基于NSObject?所以类用户:NSObject,NSCoding@Volker,不,仍然崩溃您必须先将对象转换为NSData,然后再将其添加到用户默认值中,从而回答herehttp://stackoverflow.com/questions/2315948/how-to-store-custom-objects-in-nsuserdefaultsStill 不能但我不明白为什么@devnikor您尝试过我的解决方案并将其子类化为NSObject
,这是我唯一能想到的。@devnikor检查一下,它支持了我的想法。最后子类化NSObject和NSKeyedArchiver可以修复它。谢谢