我有一个自定义类,可用作Set<ListItem>
。我想将其存储到userDefaults。但是,尝试时出现Attempt to set a non-property-list object as an NSUserDefaults
错误。我试图将其更改为Array
,然后保存它,但仍然是相同的错误。在看到一些帖子后,我还尝试了“另存为数据”,这再次给了我下面的错误。
NSForwarding:警告:类'iTunes_Search_Me.ListItem'的对象0x600003bf9a00没有实现methodSignatureForSelector:-遇到麻烦
class ListItem: Codable ,Equatable, Hashable {
let wrapperType, kind: String?
let artistID, collectionID, trackID: Int?
let artistName, collectionName, trackName: String?
let trackViewURL: String?
let artworkUrl30, artworkUrl60, artworkUrl100: String?
let releaseDate: String?
let primaryGenreName: String?
var isSelected: Bool = false
enum CodingKeys: String, CodingKey {
case wrapperType, kind
case artistID
case collectionID
case trackID
case artistName, collectionName, trackName
case trackViewURL
case artworkUrl30, artworkUrl60, artworkUrl100, releaseDate, primaryGenreName
}
static func ==(lhs: ListItem, rhs: ListItem) -> Bool {
return lhs.trackID == rhs.trackID
}
func hash(into hasher: inout Hasher) {
hasher.combine(trackID)
}
}
Attempt to set a non-property-list object as an NSUserDefaults
答案 0 :(得分:4)
您可以将模型设置为UserDefaults
,如下所示:
首先,您应该创建模型的实例
然后您可以将模型保存到UserDefaults
:
let encoder = JSONEncoder()
if let encoded = try? encoder.encode(listItemInstance) {
let defaults = UserDefaults.standard
defaults.set(encoded, forKey: "ListItemObject")
}
您可以像这样从UserDefaults
获取模型
if let savedItem = defaults.object(forKey: "ListItemObject") as? Data {
let decoder = JSONDecoder()
if let loadedItem = try? decoder.decode(ListItem.self, from: savedItem) {
print(loadedItem)
}
}
答案 1 :(得分:0)
您可以尝试首先设置保存的数据:
struct saveData{
static let encoded = "encoded"
}
然后将其保存在该键下:
UserDefaults.standard.set(encoded as! Data, forKey: "encoded")
或尝试将其另存为字符串。