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Swift泛型的理解使用1
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| // | |
| // ViewController.swift | |
| // ObjectMappingDemo | |
| // | |
| // Created by wuyongrui on 2016/11/13. | |
| // Copyright © 2016年 wuyr. All rights reserved. | |
| // | |
| import UIKit | |
| protocol FMDBTable:Mappable { | |
| static func model<T>(json:[String:Any]?, type:T.Type) -> T? where T : Mappable | |
| } | |
| extension FMDBTable { | |
| static func formatJson(originJson:[String:Any]?) -> [String:Any]? { | |
| return originJson | |
| } | |
| // type只是为了确定返回值，在函数中并没有什么作用 | |
| static func model<T>(json:[String:Any]?, type:T.Type) -> T? where T : Mappable { | |
| if let formatJson = self.formatJson(originJson: json) { | |
| return self.init(JSON: formatJson) as? T | |
| } | |
| return nil | |
| } | |
| } | |
| struct User: FMDBTable { | |
| var id = "" // 素材id | |
| var name = "" // 素材名称 | |
| init?(map: Map) { } | |
| mutating func mapping(map: Map) { | |
| id <- map["id"] | |
| name <- map["name"] | |
| } | |
| } | |
| class ViewController: UIViewController { | |
| override func viewDidLoad() { | |
| super.viewDidLoad() | |
| let json = ["id":"1", "name":"aName"] | |
| let u = User.model(json: json, type: User.self) | |
| print(u?.name) | |
| } | |
| } | |
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