如何在 Swift 中优雅地处理 JSON

因为Swift对于类型有非常严格的控制，它在处理JSON时是挺麻烦的，因为它天生就是隐式类型。SwiftyJSON是一个能帮助我们在Swift中使用JSON的开源类库。开始之前，让我们先看一下在Swift中处理JSON是多么痛苦。

在Swift中使用JSON的问题

以Twitter API为例。使用Swift，从tweet中取得一个用户的“name”值应该非常简单。下面就是我们要处理的JSON：

 
        [ 
       
        { 
       
        ...... 
       
        "text" 
        : 
        "justanothertest" 
        , 
       
...... 
       
        "user" 
        :{ 
       
"name" 
        "OAuthDancer" 
        Nowrap; margin:0px!important; padding:0px!important; border:0px!important; bottom:auto!important; float:none!important; height:auto!important; left:auto!important; line-height:1.1em!important; outline:0px!important; overflow:visible!important; position:static!important; right:auto!important; top:auto!important; vertical-align:baseline!important; width:auto!important; font-family:Consolas, 
       
        "favourites_count" 
        :7, 
       
"entities" 
        :{ 
       
        "url" 
        :{ 
       
"urls" 
        :[ 
       
        { 
       
"expanded_url" 
        : 
        null 
        Nowrap; margin:0px!important; padding:0px!important; border:0px!important; bottom:auto!important; float:none!important; height:auto!important; left:auto!important; line-height:1.1em!important; outline:0px!important; overflow:visible!important; position:static!important; right:auto!important; top:auto!important; vertical-align:baseline!important; width:auto!important; font-family:Consolas, 
       
        "http://bit.ly/oauth-dancer" 
        Nowrap; margin:0px!important; padding:0px!important; border:0px!important; bottom:auto!important; float:none!important; height:auto!important; left:auto!important; line-height:1.1em!important; outline:0px!important; overflow:visible!important; position:static!important; right:auto!important; top:auto!important; vertical-align:baseline!important; width:auto!important; font-family:Consolas, 
       
"indices" 
        :[ 
       
        0, 
       
26 
       
        ], 
       
"display_url" 
        null 
       
        } 
       
] 
       
        } 
       
...... 
       
        }, 
       
"in_reply_to_screen_name" 
        Nowrap; margin:0px!important; padding:0px!important; border:0px!important; bottom:auto!important; float:none!important; height:auto!important; left:auto!important; line-height:1.1em!important; outline:0px!important; overflow:visible!important; position:static!important; right:auto!important; top:auto!important; vertical-align:baseline!important; width:auto!important; font-family:Consolas, 
       
        Nowrap; margin:0px!important; padding:0px!important; border:0px!important; bottom:auto!important; float:none!important; height:auto!important; left:auto!important; line-height:1.1em!important; outline:0px!important; overflow:visible!important; position:static!important; right:auto!important; top:auto!important; vertical-align:baseline!important; width:auto!important; font-family:Consolas, 
       
......]

在Swift中，你必须这样使用：

        11 
      
letjsonObject:AnyObject!=NSJSONSerialization.JSONObjectWithData(dataFromTwitter,options:NSJSONReadingOptions.MutableContainers,error:nil)
 
        if 
        letstatusesArray=jsonObjectas?NSArray{ 
       
        letaStatus=statusesArray[ 
        0 
        ]as?NSDictionary{ 
       
        letuser=aStatus[ 
        "user" 
        ]as?NSDictionary{ 
       
letuserName=user[ 
        "name" 
        ]as?NSDictionary{ 
       
        //FinallyWeGottheName 
       
        } 
       
} 
       
        } 
       
}

如何在 Swift 中优雅地处理 JSON

在Swift中使用JSON的问题

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