SwiftUI-JSON序列化、反序列化

拼搏现实的明天。 2022-09-05 12:49 322阅读 0赞

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}"}]}
    """#

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