如何在userdefault中存储和检索数据？(例如:结构数组)
如何在userdefault中存储和检索数据？(例如:结构数组)
提问于 2019-05-21 20:10:05
struct ExpandableNames:Codable {
var isExpanded: Bool
var names: [String]
var icons: [String]
}
var names = ["Food/Drink", "Tours", "Transport", "Gifts","Flights", "Shopping", "Activities","Entertainment","Accomodation","Other"]
var icons = ["Food_Category", "Tours", "Transport_Category", "Gifts_Category","Flights_Category","Shopping_Category","Activities_category","Entertainment_category", "Accomodation_Category","Other_Category"]
var categoryWholeArray = [Int:ExpandableNames]()如何将categoryWholeArray存储到用户默认位置？
我试过了
商店userDefault：
UserDefaults.standard.set(try? PropertyListEncoder().encode(categoryWholeArray), forKey:"categoryWholeArray")检索数据的问题在这里
if let data = UserDefaults.standard.value(forKey:"categoryWholeArray") as? Data {
let songs2 = try? PropertyListDecoder().decode(Array<categoryWholeArray.values>.self, from: data)
}有人试过了吗？
回答 2
Stack Overflow用户
回答已采纳
发布于 2019-05-21 20:12:20
全部正确，除了
if let data = UserDefaults.standard.value(forKey:"categoryWholeArray") as? Data {
let songs2 = try? PropertyListDecoder().decode([Int:ExpandableNames].self, from: data)
print(songs2)
}Stack Overflow用户
发布于 2019-05-21 20:22:10
在UserDefaults中存储数据时，您需要encode数据，当您尝试获取这些数据时，您必须对其执行decode操作。
这是我的extension，可能会对你有所帮助。
extension UserDefaults {
func setCustomObjToUserDefaults(CustomeObj: AnyObject, forKey:String) {
let defaults = UserDefaults.standard
let encodedData = NSKeyedArchiver.archivedData(withRootObject: CustomeObj)
defaults.set(encodedData, forKey: forKey)
defaults.synchronize()
}
func getCustomObjFromUserDefaults(forKey:String) -> AnyObject? {
let defaults = UserDefaults.standard
if defaults.object(forKey: forKey) != nil {
if let decoded = defaults.object(forKey: forKey) as? Data {
let decodedTeams = NSKeyedUnarchiver.unarchiveObject(with:decoded) as AnyObject
return decodedTeams
}
}
return nil
}
func setJsonObject<T: Encodable>(encodable: T, forKey key: String) {
if let data = try? JSONEncoder().encode(encodable) {
set(data, forKey: key)
}
}
func getJsonObject<T: Decodable>(_ type: T.Type, forKey key: String) -> T? {
if let data = object(forKey: key) as? Data,
let value = try? JSONDecoder().decode(type, from: data) {
return value
}
return nil
}
func removeCustomObject(forKey:String)
{
let defaults = UserDefaults.standard
defaults.removeObject(forKey: forKey)
defaults.synchronize()
}
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/56238000
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