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:
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|
[
{
......
"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:
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
}
}
}
}
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