这个性能有点低怎么办

[phpmaple]

trafficstars

我就拿官方的 demo 去测试了，用的最简单的 json

let jsonString = "{"data":{"aInt":100,"aStr":"string data","id":1},"code":200,"biz":"social"}"

let result = Result<Model>.deserialize(from: jsonString)

	override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.

        print(CACurrentMediaTime())
        for i in 1...200 {
             self.deserialization()
        }
        print(CACurrentMediaTime())
	}

200 个都需要 0.04s 在 60 帧的刷新率下完全不能在主线程转

[lkkwxy]

有跟系统的提供的codeAble进行比对吗？

[zhangjianjun056]

let jsonDic = ["doubleOptional":1.1, "stringImplicitlyUnwrapped":"hello", "int":1] as [String : Any]

系统提供的转模型：

/// 字典转模型
func toModel<T>(_ type: T.Type, value: Any) -> T? where T : Decodable {
    guard let data = try? JSONSerialization.data(withJSONObject: value) else { return nil }
    let decoder = JSONDecoder()
    decoder.nonConformingFloatDecodingStrategy = .convertFromString(positiveInfinity: "+Infinity", negativeInfinity: "-Infinity", nan: "NaN")
    return try? decoder.decode(type, from: data)
}

let startTime = CACurrentMediaTime()
    for _ in 1...200 {
        tempModel = toModel(Model.self, value: jsonDic)
    }
    let endTime = CACurrentMediaTime()
    print("time = \(endTime-startTime)") // time = 0.013348208332899958

耗时大概是： time = 0.013348208332899958

HandyJSON转模型：

let startTime = CACurrentMediaTime()
    for _ in 1...200 {
        tempModel = Model.deserialize(from: jsonDic)
    }
    let endTime = CACurrentMediaTime()
    print("time = \(endTime-startTime)") // time = 0.011834375007310882

耗时大概是 time = 0.011834375007310882

结论：耗时差不多。

[MengLiMing]

let jsonDic = ["doubleOptional":1.1, "stringImplicitlyUnwrapped":"hello", "int":1] as [String : Any]

系统提供的转模型：

/// 字典转模型
func toModel<T>(_ type: T.Type, value: Any) -> T? where T : Decodable {
    guard let data = try? JSONSerialization.data(withJSONObject: value) else { return nil }
    let decoder = JSONDecoder()
    decoder.nonConformingFloatDecodingStrategy = .convertFromString(positiveInfinity: "+Infinity", negativeInfinity: "-Infinity", nan: "NaN")
    return try? decoder.decode(type, from: data)
}

let startTime = CACurrentMediaTime()
    for _ in 1...200 {
        tempModel = toModel(Model.self, value: jsonDic)
    }
    let endTime = CACurrentMediaTime()
    print("time = \(endTime-startTime)") // time = 0.013348208332899958

耗时大概是： time = 0.013348208332899958

HandyJSON转模型：

let startTime = CACurrentMediaTime()
    for _ in 1...200 {
        tempModel = Model.deserialize(from: jsonDic)
    }
    let endTime = CACurrentMediaTime()
    print("time = \(endTime-startTime)") // time = 0.011834375007310882

耗时大概是 time = 0.011834375007310882

结论：耗时差不多。

是不是因为你的数据模型是NSObject的子类。解析swift的类应该会慢一点吧，Mirror开销会大一点吧。