最近在學(xué)習(xí)swift蛾方，也是按照別人的代碼敲打的水平，雖然時間不長袭厂，但是還是深刻的感覺到swift結(jié)構(gòu)體和枚舉的強(qiáng)大剑刑，下面是本人從別人代碼里看到的一段關(guān)于json解析的封裝媳纬，感覺非常不錯所以想和大家分享分享，也借此來記錄我學(xué)習(xí)的腳步施掏。
在沒有看到這段代碼之前层宫，我是用一個簡單的方法進(jìn)行解析，數(shù)據(jù)返回的形式是Any其监，我是強(qiáng)制性轉(zhuǎn)化為AnyObject返回給調(diào)用者

let object: Any = try JSONSerialization.jsonObject(with: data, options: opt)

沒有對數(shù)據(jù)類型進(jìn)行任何判斷萌腿，因為一般數(shù)據(jù)解析，我們都是可以提前看到數(shù)據(jù)類型的抖苦，也沒有必要在這進(jìn)行太多的判斷毁菱，我是這樣僥幸的想的米死。

偶爾看到了這段代碼，所以也想和大家分享一下

1.定義了一個枚舉類表示數(shù)據(jù)類型

public enum Type :Int{
    case number
    case string
    case bool
    case array
    case dictionary
    case null
    case unknown
}

2.然后定義了一個JSON結(jié)構(gòu)體來做這件事

public struct JSON {

    
    public init(data:Data, options opt: JSONSerialization.ReadingOptions = .allowFragments, error: NSErrorPointer? = nil) {
        do {
            let object: Any = try JSONSerialization.jsonObject(with: data, options: opt)
            self.init(object as AnyObject)
            
        } catch let aError as NSError {
            if error != nil {
                error??.pointee = aError
            }
            self.init(NSNull())
        }
    }
    
    public init(_ object: AnyObject) {
        self.object = object
    }

    
    
    /// Private object
    fileprivate var rawArray: [AnyObject] = []
    fileprivate var rawDictionary: [String : AnyObject] = [:]
    fileprivate var rawString: String = ""
    fileprivate var rawNumber: NSNumber = 0
    fileprivate var rawNull: NSNull = NSNull()
    fileprivate var _type: Type = .null
    fileprivate var _error: NSError? = nil
    
    var object : AnyObject{
   
        get
        {
            switch self._type {
            case .array:
                return self.rawArray as AnyObject
            case .dictionary:
                return self.rawDictionary as AnyObject
            case .string:
                return self.rawString as AnyObject
            case .number:
                return self.rawNumber as AnyObject
            case .bool:
                return self.rawNumber as AnyObject
            default:
                return self.rawNull
            }
            
        }set{
            _error = nil
            switch newValue {
                
            case let number as NSNumber:
                if number.boolValue {
                    
                    _type = .bool
                }else{
                    _type = .number
                }
                self.rawNumber = number
                
            case let string as String:
                _type = .string
                self.rawString = string
            case  _ as NSNull:
                _type = .null
            case let array as [AnyObject]:
                _type = .array
                self.rawArray = array
            case let dictionary as [String : AnyObject]:
               
                _type = .dictionary
                self.rawDictionary = dictionary
            default:
                _type = .unknown
                _error = NSError.init(domain: "SwiftyJSONErrorDomain", code: 999, userInfo: [NSLocalizedDescriptionKey: "It is a unsupported type"])
            }
            
        }
    
    }


}

整段代碼對數(shù)據(jù)類型判斷的很全面贮庞，雖然代碼量有點多峦筒，但是找不到方法去拒絕。