提出的問題，同時通過使用swift從JSON中獲取數據

Question

我使用swift從JSON中檢索數據。我是JSON的新手。我不知道如何檢索這個嵌套值。我的JSON格式如下。

//JSON DATA 
{ 
    "data": [ 
     { 
      "category_id": 1, 
      "category_name": "category1", 
      "category_icon": "", 
      "category_child": [ 
       { 
        "sub_category_id": 11, 
        "sub_category_name": "subcategoryname1", 
        "sub_category_icon": "" 
       }, 
       { 
        "sub_category_id": 12, 
        "sub_category_name": "subcategoryname2", 
        "sub_category_icon": "" 
       } 
      ] 
     }, 
     { 
      "category_id": 2, 
      "category_name": "category2", 
      "category_icon": "", 
      "category_child": [ 
       { 
        "sub_category_id": 21, 
        "sub_category_name": "subcategoryname12", 
        "sub_category_icon": "" 
       }, 
       { 
        "sub_category_id": 22, 
        "sub_category_name": "subcategoryname22", 
        "sub_category_icon": "" 
       } 
      ] 
     } 
    ] 
} 

我試過一些方法。但是，我沒有在字典中找到合適的元素。我的代碼如下：

ATTEPMT 1: 
var dict: NSDictionary! = NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.MutableContainers, error: nil) as NSDictionary 

     for(var i = 0; i < (dict.valueForKey("data") as NSArray).count; i++) 
     { 
      self.categFromJson.addObject((dict.valueForKey("data") as NSArray) .objectAtIndex(i)) 

     } 

     for(var i = 0; i < (categFromJson.valueForKey("category_child") as NSArray).count; i++) 
     { 
      self.sub_ct_FromArr.addObject((categFromJson.valueForKey("category_child") as NSArray) .objectAtIndex(i)) 

     } 

     for(var i = 0; i < (sub_ct_FromArr.valueForKey("sub_category_name") as NSArray).count; i++) 
     { 
      self.sub_ct_name_arr.addObject((sub_ct_FromArr.valueForKey("sub_category_name") as NSArray) .objectAtIndex(i)) 

     } 


//ATTEMPT 2 
var dict: NSDictionary! = NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.MutableContainers, error: nil) as NSDictionary 

for(var i = 0; i < (dict.valueForKey("data") as NSArray).count; i++) 
{ 
    categFromJson.addObject((dict.valueForKey("data") as NSArray) .objectAtIndex(i)) 

    sub_ct_FromArr.addObject((categFromJson.valueForKey("category_child") as NSArray) .objectAtIndex(i)) 

    sub_ct_name_arr.addObject((sub_ct_FromArr.valueForKey("sub_category_name") as NSArray) .objectAtIndex(i)) 
} 

但是，對於這兩種嘗試，最終輸出都是錯誤和相同的。 Bcos，編碼如下。

//CODING 
println(sub_ct_name_arr.objectAtIndex(0)) 

//Output for this Code 
(subcategoryname1,subcategoryname2) 
//REQUIRED Output 
subcategoryname1 

請親引導我。我不知道那是什麼問題。

Answer 1

首先，瞭解您擁有什麼樣的數據非常重要。

然後你就可以得到像這根對象，以下哪個對象是哪種類型：

let dict = NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.MutableContainers, error: nil) as! NSDictionary 

let dataArray = dict["data"] as! [[String:AnyObject]] // The array of dictionaries 

for object in dataArray { 
    let category_id = object["category_id"] as! Int 
    let category_name = object["category_name"] as! String 
    // etc 
    let category_child = object["category_child"] as! [[String:AnyObject]] 
    for child in category_child { 
     let sub_category_id = child["sub_category_id"] as! Int 
     let sub_category_name = child["sub_category_name"] as! String 
     println(sub_category_id) 
     println(sub_category_name) 
    } 
} 

你，如果你有很多的解碼也可以考慮使用像SwiftyJSON庫做。