如何解析本地文件中的json数据？

我对 json 解析非常陌生，并尝试解析一个包含汽车列表的 json 文件，但是当我解析时，它给出 nil

    func jsonTwo(){
    let url = Bundle.main.url(forResource: "car_list", withExtension: "json")!
    let data = try! Data(contentsOf: url)
    let JSON = try! JSONSerialization.jsonObject(with: data, options: []) as? [String : Any]
    print(".........." , JSON , ".......")
    let brand = JSON?["models"] as? [[String : Any]]
    print("=======",brand,"=======")
}

当我对此代码进行一些修改时，如下所示

    func jsonTwo(){
    let url = Bundle.main.url(forResource: "car_list", withExtension: "json")!
    let data = try! Data(contentsOf: url)
    let JSON = try! JSONSerialization.jsonObject(with: data, options: []) 
    print(".........." , JSON , ".......")
    let brand = JSON["brand"] as? [[String : Any]]
    print("=======",brand,"=======")
}

然后我收到错误消息“类型‘Any’没有下标成员”

下面是我正在使用的 json 文件的示例

[{"brand": "Aston Martin", "models": ["DB11","Rapide","Vanquish","Vantage"]}]

外部对象是一个数组，请注意[]和键的值models是一个字符串数组。

func jsonTwo() {
    let url = Bundle.main.url(forResource: "car_list", withExtension: "json")!
    let data = try! Data(contentsOf: url)
    let json = try! JSONSerialization.jsonObject(with: data) as! [[String : Any]]
    print(".........." , JSON , ".......")
    for item in json {
        let brand = item["brand"] as! String
        let models = item["models"] as! [String]
        print("=======",brand, models,"=======") 
    }
}

或者更舒服Decodable

struct Car: Decodable {
    let brand : String
    let models : [String]
}

func jsonTwo() {
    let url = Bundle.main.url(forResource: "car_list", withExtension: "json")!
    let data = try! Data(contentsOf: url)
    let cars = try! JSONDecoder().decode([Car].self, from: data)
    for car in cars {
        let brand = car.brand
        let models = car.models
        print("=======",brand, models,"=======") 
    }
}

通常，强烈建议您不要使用以下命令强制展开选项!但在这种情况下，代码一定不能崩溃，因为应用程序包中的文件在运行时是只读的，任何崩溃都会显示design错误。