SwiftUI-JSON序列化、反序列化-蒲公英云

SwiftUI-JSON序列化、反序列化

Swift5 自带解析

extension Encodable{
    func toJson() -> String {
        return String(data: try! JSONEncoder().encode(self), encoding: .utf8) ?? ""
    }
}
extension String{
    func toModel<T:Decodable>() -> T? {
        do{
            return try JSONDecoder().decode(T.self, from: self.data(using: .utf8)!)
        }catch{
        }
        return nil
    }
}

结构体实现 Codable 协议：里面的字段为基础类型或者结构体（结构体实现 Codable），不能有 protocol 类型

具体示例

/// 界面元素
struct MUIContent:Codable{
    var key : String
    var desc : String?
    var content : String // 元素内容
    init<T : MUI>(mui:T) {
        self.key = T.key
        self.desc = mui.desc
        self.content = mui.toJson()
    }
}
protocol MUI:Codable{
    static var key : String {
    get}
    var desc : String? {
    get}
}
/// 小组件数据
struct MWidget: Codable{
    var list: [MUIContent] = [] //元素列表
    var backgroud: MWidgetBackgroud?
    mutating func append<T:MUI>(t:T) {
        let content = MUIContent(mui: t)
        list.append(content)
    }
}
/// 小组件背景
struct MWidgetBackgroud:Codable {
    var color:Int = 0xFFFFFFFF
    var image:String?
    var borderWidth:Float = 0
    var borderColor:Int = 0xFFFFFFFF
}
struct MDateUI : MUI {
    static var key: String = "date"
    var desc: String? {
        let dateFormatter = DateFormatter()
        dateFormatter.dateFormat = "yyyy-MM-dd"
        dateFormatter.locale = Locale.current
        return dateFormatter.string(from: Date())
    }
    var offsetX: Float = 0
    var offsetY: Float = 0
    var fontSize: Float = 14
}
let KEY_DATE = "date"
let KEY_TIME = "time"
struct MTimeUI : MUI {
    static var key: String = "time"
    var desc: String? {
        let dateFormatter = DateFormatter()
        dateFormatter.dateFormat = "HH:mm"
        dateFormatter.locale = Locale.current
        return dateFormatter.string(from: Date())
    }
    var offsetX: Float = 0
    var offsetY: Float = 0
    var fontSize: Float = 14
}
let MUIKeyMapp:[String:Any] = [
    KEY_TIME : MTimeUI.self,
    KEY_DATE : MDateUI.self
]
extension Encodable{
    func toJson() -> String {
        return String(data: try! JSONEncoder().encode(self), encoding: .utf8) ?? ""
    }
}
extension String{
    func toModel<T:Decodable>() -> T? {
        do{
            return try JSONDecoder().decode(T.self, from: self.data(using: .utf8)!)
        }catch{
        }
        return nil
    }
}
var m = MWidget()
m.append(t: MDateUI())
m.append(t: MTimeUI())
print(m.toJson())
let mJson = #"""
    {
    "list":[{
    "key":"date","desc":"2021-08-04","content":"{\"offsetX\":10,\"offsetY\":10,\"fontSize\":14}"},{
    "key":"time","desc":"11:03","content":"{\"offsetX\":11,\"offsetY\":11,\"fontSize\":24}"}]}
"""#