出现问题,同时使用 swift 从 JSON 检索数据 [英] Issue raised, while retriving datas from JSON by using swift
问题描述
我正在使用 swift 从 JSON 中检索数据.我是 JSON 的新手.我不知道如何检索这个嵌套值.我的 JSON 格式如下.
I am retrieving datas from JSON by using swift. I am new to JSON. I don't how to retrieve this nested values. My JSON format is below.
//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": ""
}
]
}
]
}
我尝试了一些方法.但是,我未能在字典中获得适当的元素.我的代码如下:
I have tried some ways. But, I failed to get proper elements in dictionary. My code is below:
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,对于两次尝试,最终输出都是错误且相同的.Bcos,代码如下.
But, for both attempt, final output is wrong and same. Bcos, coding below.
//CODING
println(sub_ct_name_arr.objectAtIndex(0))
//Output for this Code
(subcategoryname1,subcategoryname2)
//REQUIRED Output
subcategoryname1
请指导我.我不知道那是什么问题.
Kindly guide me. I don't know what is that issue.
推荐答案
首先,将您拥有的数据类型可视化很重要.
First, it's important to visualize what kind of data you have.
然后你可以像这样得到根对象,跟随哪个对象是哪种类型:
Then you can get root objects like this, following which object is of which type:
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)
}
}
如果您有很多解码工作要做,您也可以考虑使用像 SwiftyJSON 这样的库.
You also might consider using a library like SwiftyJSON if you have a lot of decoding to do.
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