swift 用户结构体存本地

import Foundation

let userModelFilePath = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true).last! + "/userModelData"

struct UserModel:Codable {
    var name: String = ""
    var age: String = ""
    var sex: String = ""
    var weight: Float = 0
    var work: String?
    
    private enum CodingKeys: String, CodingKey {
        case name
        case age
        case sex
        case weight
        case work
    }
    
    init(name: String, age: String, sex: String, weight: Float, work: String?) {
        self.name = name
        self.age = age
        self.sex = sex
        self.weight = weight
        self.work = work
    }
    
//    func encode(to encoder: Encoder) throws {
//        var container = encoder.container(keyedBy: CodingKeys.self)
//        do {
//            try container.encode(name, forKey: .name)
//            try container.encode(age, forKey: .age)
//            try container.encode(sex, forKey: .sex)
//            try container.encode(weight, forKey: .weight)
//            try container.encode(work, forKey: .work)
//        }catch {
//            
//        }
//    }
    
//    init(from decoder: Decoder) throws {
//        do {
//            let container = try decoder.container(keyedBy: CodingKeys.self)
//            name = try container.decode(String.self, forKey: .name)
//            age = try container.decode(String.self, forKey: .age)
//            sex = try container.decode(String.self, forKey: .sex)
//            weight = try container.decode(Float.self, forKey: .weight)
//            work = try container.decode(String.self, forKey: .work)
//        }catch {
//
//        }
//    }
}


class UserModelTool {
    class func saveUser(_ user: UserModel) {
        let encoder = JSONEncoder()
        do {
            let data = try encoder.encode(user)
            try data.write(to: URL(fileURLWithPath: userModelFilePath))
        }catch {
            
        }
    }
    
    class func user() -> UserModel? {
        let decoder = JSONDecoder()
        let fileManager = FileManager.default
        guard let data = fileManager.contents(atPath: userModelFilePath) else {
            return nil
        }
        do {
            let user = try decoder.decode(UserModel.self, from: data)
            return user
        }catch {
            
        }
        return nil
    }
}