也许有人可以看看我的代码,看看它是否有意义。
class TopFlopState: Codable, PersistenceState {
var group: Groups = .large {
didSet {
save()
}
}
var base: Bases = .usd {
didSet {
save()
}
}
var valueOne: StatIntervalBaseModel = StatIntervalBaseModel(stat: "ppc", interval: "24h", base: "usd") {
didSet {
save()
}
}
init(){
let savedValues = load()
if savedValues != nil {
self.group = savedValues!.group
self.base = savedValues!.base
self.valueOne = savedValues!.valueOne
}
}
}
这是PersistenceState协议:
/**
Saves and Loads the class, enum etc. with UserDefaults.
Has to conform to Codable.
Uses as Key, the name of the class, enum etc.
*/
protocol PersistenceState {
}
extension PersistenceState where Self: Codable {
private var keyUserDefaults: String {
return String(describing: self)
}
func save() {
saveUserDefaults(withKey: keyUserDefaults, myType: self)
}
func load() -> Self? {
return loadUserDefaults(withKey: keyUserDefaults)
}
private func saveUserDefaults<T: Codable>(withKey key: String, myType: T){
do {
let data = try PropertyListEncoder().encode(myType)
UserDefaults.standard.set(data, forKey: key)
print("Saved for Key:", key)
} catch {
print("Save Failed")
}
}
private func loadUserDefaults<T: Codable>(withKey key: String) -> T? {
guard let data = UserDefaults.standard.object(forKey: key) as? Data else { return nil }
do {
let decoded = try PropertyListDecoder().decode(T.self, from: data)
return decoded
} catch {
print("Decoding failed for key", key)
return nil
}
}
}
