[英]Save json in userDefaults
这是设定功能
func setSelectedDivisions(_ division:[Division]) {
if (division.count != 0) {
self.userDefaults.set(division.toJSONString(), forKey: "selectedDivisions")
self.userDefaults.synchronize()
}
else{
self.userDefaults.removeObject(forKey: "selectedDivisions")
self.userDefaults.synchronize()
}
}
这是get函数
func getSelectedDivisions() -> [Division] {
if let json = self.userDefaults.value(forKey: "selectedDivisions"){
print(json)
}
if let json = self.userDefaults.value(forKey: "selectedDivisions") as? Array<Dictionary<String, Any>> {
if json.count != 0{
let divisions = Mapper<Division>().mapArray(JSONArray: json)
if divisions.count != 0{
return divisions
}
}
}
return []
}
在get函数中,我收到错误消息,告诉我我的序列化错误。 这是我试图得到的json
[{“ name”:“أ”,“ img”:“ http://www.smsalmaali.com/images/cclass/21.jpg”,“ name2”:“الصفالاول”,“ id1”:“ 21” ,“ id2”:“ 1”}]
有解决的主意吗?
我认为这行代码是错误的
if let json = self.userDefaults.value(forKey: "selectedDivisions") as? Array<Dictionary<String, Any>>
首先,您需要将json字符串转换为数组对象,如下所示
let data = (self.userDefaults.value(forKey: "selectedDivisions") as! String).data(using: String.Encoding.utf8) as NSData?
if data == nil || data!.length == 0 {
return
} else {
do {
let resultJSON = try JSONSerialization.jsonObject(with: data! as Data, options: .mutableContainers)
if let json = resultJSON as? Array<Dictionary<String, Any>> {
// do something
}
} catch _ {
print("exception ")
}
使用SwiftyJSON非常简单
Xcode 8 +,Swift 3x
func saveJSON(json: JSON) {
UserDefaults.standard.setValue(j.rawString()!, forKey: "YOUR_KEY")
}
func getJSON() -> JSON {
return JSON.parse(UserDefaults.standard.value(forKey: "YOUR_KEY") as! String)
}
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