我是新来的，我正在解析json，它是侧面数组中的数组，所以我不明白如何从json进入内部数组，让我向您展示我的json。
JSON
{
"subject_list" = (
{
"con_id" = 2;
"level_id" = 1;
"sub_id" = 4;
"sub_list" = (
{
"ch_id" = 17;
"ch_image" = "http://mobileapp.xmeducation.com/upload/1530600693.jpg";
"ch_name" = " 01. Measurement";
"con_id" = 2;
"level_id" = 1;
"sub_id" = 4;
},
{
"ch_id" = 23;
"ch_image" = "http://mobileapp.xmeducation.com/upload/1451930609.jpg";
"ch_name" = "1. Test Chapter";
"con_id" = 2;
"level_id" = 1;
"sub_id" = 4;
},
{
"ch_id" = 24;
"ch_image" = "http://mobileapp.xmeducation.com/upload/1884777188.jpg";
"ch_name" = "1. Test Chapter";
"con_id" = 2;
"level_id" = 1;
"sub_id" = 4;
},
{
"ch_id" = 25;
"ch_image" = "http://mobileapp.xmeducation.com/upload/1518702048.jpg";
"ch_name" = "1. Test Chapter";
"con_id" = 2;
"level_id" = 1;
"sub_id" = 4;
}
);
"sub_name" = Physics;
},
{
"con_id" = 2;
"level_id" = 1;
"sub_id" = 8;
"sub_list" = (
{
"ch_id" = 26;
"ch_image" = "http://mobileapp.xmeducation.com/upload/1437196139.jpg";
"ch_name" = " 1. Test Chapter";
"con_id" = 2;
"level_id" = 1;
"sub_id" = 8;
},
{
"ch_id" = 27;
"ch_image" = "http://mobileapp.xmeducation.com/upload/1903171865.jpg";
"ch_name" = "1. Test Chapter";
"con_id" = 2;
"level_id" = 1;
"sub_id" = 8;
}
);
"sub_name" = Chemistry;
},
{
"con_id" = 2;
"level_id" = 1;
"sub_id" = 9;
"sub_list" = (
{
"ch_id" = 31;
"ch_image" = "http://mobileapp.xmeducation.com/upload/1319333294.jpg";
"ch_name" = "1. Test Chapter";
"con_id" = 2;
"level_id" = 1;
"sub_id" = 9;
}
);
"sub_name" = Testing;
},
{
"con_id" = 2;
"level_id" = 1;
"sub_id" = 10;
"sub_list" = (
{
"ch_id" = 28;
"ch_image" = "http://mobileapp.xmeducation.com/upload/1373218664.jpg";
"ch_name" = "1. Test Chapter";
"con_id" = 2;
"level_id" = 1;
"sub_id" = 10;
}
);
"sub_name" = "Test Subject";
},
{
"con_id" = 2;
"level_id" = 1;
"sub_id" = 11;
"sub_list" = (
{
"ch_id" = 29;
"ch_image" = "http://mobileapp.xmeducation.com/upload/246189282.jpg";
"ch_name" = "1. Test Chapter";
"con_id" = 2;
"level_id" = 1;
"sub_id" = 11;
}
);
"sub_name" = "Test Subject 1";
},
{
"con_id" = 2;
"level_id" = 1;
"sub_id" = 12;
"sub_list" = (
{
"ch_id" = 30;
"ch_image" = "http://mobileapp.xmeducation.com/upload/1342731807.jpg";
"ch_name" = "1. Test Chapter";
"con_id" = 2;
"level_id" = 1;
"sub_id" = 12;
}
);
"sub_name" = "Test Subject 2";
}
);
这是我的JSON，我想从sub_list中提取subject_list数组，我做了一些代码让我看看。
代码
func callSubChapAPI(){
let preferences = UserDefaults.standard
let studentlvl = "student_lvl"
let student_lvl = preferences.object(forKey: studentlvl) as! String
print(student_lvl)
let params = ["level_id": student_lvl]
Alamofire.request(subListWithChapter, method: .post, parameters: params).responseJSON(completionHandler: {(response) in
switch response.result{
case.success(let data):
print(data)
let json = JSON(data)
print(json)
do {
let decoder = JSONDecoder()
decoder.keyDecodingStrategy = .convertFromSnakeCase
let subjects = try decoder.decode(SubjectResponse.self, from: data as! Data)
print(subjects)
} catch {
print(error)
}
case.failure(let error):
print(error.localizedDescription)
}
})
}
这是我的结构：
struct sub_list {
let ch_id : Int
let ch_image: String
let ch_name: String
let con_id: String
let level_id: String
let sub_id: String
}
请查看我的代码和json格式，请告诉我如何从json获取sub_list数组，请打扰我，谢谢。
答案 0 :(得分：0)
实际上subject_list也是array，因此您也需要对其进行迭代。
let data = json["subject_list"]
print(data)
data.array?.forEach({ (subject) in
subject["sub_list"].array?.forEach({ (chapList) in
let chapter = sub_list(ch_id: chapList["ch_id"].intValue, ch_image: chapList["ch_image"].stringValue, ch_name: chapList["ch_name"].stringValue, con_id: chapList["con_id"].stringValue, level_id: chapList["level_id"].stringValue, sub_id: chapList["sub_id"].stringValue)
print(chapter)
self.chapListData.append(chapter)
})
})
self.collView.reloadData()
推荐
如果您已经有Apple提供的json，则不值得为Codable解析添加任何依赖关系。它将减少由于SwiftyJSON而添加的许多样板代码。
以下是您当前api的完整示例，
struct SubjectResponse: Decodable {
let subjectList: [Subject]
}
struct Subject: Decodable {
let subList: [Chapter]
}
struct Chapter: Decodable {
let chId : Int
let chImage: String
let chName: String
let conId: Int
let levelId: Int
let subId: Int
}
Alamofire.request(subListWithChapter, method: .post, parameters: params).responseData() { (response) in
switch response.result {
case .success(let data):
do {
let decoder = JSONDecoder()
decoder.keyDecodingStrategy = .convertFromSnakeCase
let subjects = try decoder.decode(SubjectResponse.self, from: data)
print(subjects)
} catch {
print(error)
}
case .failure(let error):
print(error.localizedDescription)
}
}