SwiftyJSON：无法从JSON读取数组值

Question

我无法从使用SwiftyJSON的JSON获取我的字符串数组。我有这样的JSON

{ 
    "categories": { 
     "202": "Women's Clothing", 
     "104": "Men's Clothing" 
    }, 
    "products": [{ 
     "price": 528500.0, 
     "title": "Some title with long name", 
     "id": "13864671" 
    }..., ..., ...], 
    "keywords": ["hoodie", "hoodie paramore i", "hoodie daft punk", "hoodie muse", "hoodie nirvana"] 
} 

我的问题是，我可以打印类别和产品，但我不能打印关键字。它只是给我空白阵列[]。那么这里有什么问题？

Alamofire.request(request).responseJSON { 
    response in 
    if response.result.error == nil { 
     let json = JSON(response.result.value!) 
     print(json) 
     success(json) 
    }else{ 
     error("\(response.result.error?.localizedDescription)") 
    } 
} 

当我打印json，我categories和products是除了keywords，让我没有价值[]罚款。

这里是我的日志上的Xcode

{ 
    "categories" : { 
    "111" : "Men's Clothing", 
    "122" : "Women's Clothing" 
    }, 
    "keywords" : [ 

    ], 
    "products" : [ 
    { 
     "price" : 123, 
     "title" : "Long name product", 
     "id" : "123123" 
    } 
    ] 
} 

任何帮助，将不胜感激。谢谢！

Answer 1

试试这个代码：

Product.swift

import Foundation 
import SwiftyJSON 

class Product { 

var price: Double? 
var title: String? 
var id: String? 


init (json: JSON) { 

    if let price = json["price"].double { 
     self.price = price 
    } 

    if let title = json["title"].string { 
     self.title = title 
    } 

    if let id = json["id"].string { 
     self.id = id 
    } 
} 

var description: String { 
    get { 
     var _description = "" 

     if let price = self.price { 
      _description += "price: \(price)\n" 
     } 

     if let title = self.title { 
      _description += "title: \(title)\n" 
     } 

     if let id = self.id { 
      _description += "id: \(id)\n" 
     } 

     return _description 
    } 
} 
} 

ViewController.swift

import UIKit 
import SwiftyJSON 

class ViewController: UIViewController { 

var keywords = [String]() 
var categories = [String:String]() 
var products = [Product]() 

override func viewDidLoad() { 
    super.viewDidLoad() 
    // Do any additional setup after loading the view, typically from a nib. 

    if let path = NSBundle.mainBundle().pathForResource("data", ofType: "json") { 
     if let data = NSData(contentsOfFile: path) { 
      let json = JSON(data: data) 
      //NSLog("\(json)") 

      if let keywords = json["keywords"].array { 
       for keyword in keywords { 
        if let keyword = keyword.string { 
         self.keywords.append(keyword) 
        } 
       } 
      } 

      if let categories = json["categories"].dictionary { 
       for key in categories.keys { 
        if let category = categories[key]?.stringValue { 
         self.categories.updateValue(category, forKey: key) 
        } 
       } 
      } 

      if let products = json["products"].array { 
       for product in products { 
        self.products.append(Product(json: product)) 
       } 
      } 

     } 
    } 

    print("keywords: \(keywords)") 
    print("categories: \(categories)") 
    print("products:\n") 
    for product in products { 
     print(product.description) 
    } 
} 

override func didReceiveMemoryWarning() { 
    super.didReceiveMemoryWarning() 
    // Dispose of any resources that can be recreated. 
} 
} 

data.json

{ 
"categories": { 
    "202": "Women's Clothing", 
    "104": "Men's Clothing" 
}, 
"products": [{ 
      "price": 528500.0, 
      "title": "Some title with long name", 
      "id": "13864671" 
      }, 
      { 
      "price": 528531200.0, 
      "title": "!!Some title with long name", 
      "id": "13223864671" 
      }], 
"keywords": ["hoodie", "hoodie paramore i", "hoodie daft punk", "hoodie muse", "hoodie nirvana"] 
} 

结果