iOS Swift 读取本地json文件

Error Domain=NSCocoaErrorDomain Code=3840 "JSON text did not start with array or object and option to allow fragments not set." UserInfo={NSDebugDescription=JSON text did not start with array or object and option to allow fragments not set.}

let path = Bundle.main.path(forResource: "countryData", ofType: "json")
let url = URL(fileURLWithPath: path!)
// 带throws的方法需要抛异常
    do {
              /*
                 * try 和 try! 的区别
                 * try 发生异常会跳到catch代码中
                 * try! 发生异常程序会直接crash
                 */
            let data = try Data(contentsOf: url)
            let jsonData:Any = try JSONSerialization.jsonObject(with: data, options: JSONSerialization.ReadingOptions.mutableContainers)
            let jsonArr = jsonData as! NSArray
            
            for dict in jsonArr {
                print(dict)
            }
        } catch let error as Error! {
            print("读取本地数据出现错误!",error)
        }