JSON参数选择

96
Just_go
2019.07.14 17:48 字数 119

通常json 反序列化方法:

let object = try JSONSerialization.jsonObject(with: jsonData, options: [])

options 有这些:

@available(iOS 5.0, *)
    public struct ReadingOptions : OptionSet {

        public init(rawValue: UInt)

        public static var mutableContainers: JSONSerialization.ReadingOptions { get }

        public static var mutableLeaves: JSONSerialization.ReadingOptions { get }

        public static var allowFragments: JSONSerialization.ReadingOptions { get }
    }
  1. mutableContainers:
    在 OC 中, 如果想用 mutableArray 或者 mutableDictionary 接收, 必须使用这个参数。
    在 swift 中用 var 修饰的对象就是可变, 所以不需要在转换的时候指定
  2. allowFragments:
    如果要转换的 data 不是 array, 也不是 dictionary, 就需要用这个 option 了, 不然报
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.
  1. mutableLeaves:
    Guarantees the NSStrings contained in the result must be NSMutableStrings. Rarely used even in old Objective-C codes, ignore it.
随笔