在解析Swift中的JSON時爲零

Question

我正在做一些簡單的項目來學習新事物。我開始用SwiftyJSON解析JSON。我試圖向tableView顯示一些JSON數據，但現在我卡住了。我不知道哪裏是零，爲什麼。你能幫助我嗎？在給定的代碼中，我試圖獲取"Brands"並在tableView內顯示它們，或者至少將它們打印到console中。

這是.json文件我有：

{ 
    "Snuses": { 
     "Brands":{ 


      "CATCH": [ 
         {"Products":"white", "nicotine":"8.0"}, 
         {"Products":"yellow", "nicotine":"8.0"} 
         ], 
      "GENERAL": [ 
         {"Products":"brown", "nicotine":"8.0"}, 
         {"Products":"white", "nicotine":"8.0"} 
         ] 
     } 
    } 
} 

在這裏，我試圖得到這樣的信息：

var numberOfRows = 0 

var snusBrandsArray = [String]() 

override func viewDidLoad() { 
    super.viewDidLoad() 
    parseJSON() 
} 

override func didReceiveMemoryWarning() { 
    super.didReceiveMemoryWarning() 

} 

func parseJSON(){ 
    let path: String = NSBundle.mainBundle().pathForResource("snuses", ofType: "json") as String! 
    let jsonData = NSData(contentsOfFile: path) as NSData! 
    let readableJSON = JSON(data: jsonData, options: NSJSONReadingOptions.MutableContainers, error: nil) 

    var brands = readableJSON["Snuses", "Brands"] 

    NSLog("\(brands)") 

    numberOfRows = readableJSON["Snuses"].count 

    for i in 1...numberOfRows{ 
     var brands = "Snuses" 
     brands += "\(i)" 
     var name = readableJSON["Snuses", "Brands"].string as String! 
     snusBrandsArray.append(name) 
    } 
} 

Answer 1

怎麼樣簡單的東西，這樣的嗎？下面是Playground代碼，但解析是一樣的。

//: Playground 

import UIKit 
import Foundation 

var jsonStr = "{ \"Snuses\": { \"Brands\":{ \"CATCH\": [ {\"Products\":\"white\", \"nicotine\":\"8.0\"}, {\"Products\":\"yellow\", \"nicotine\":\"8.0\"} ], \"GENERAL\": [ {\"Products\":\"brown\", \"nicotine\":\"8.0\"}, {\"Products\":\"white\", \"nicotine\":\"8.0\"} ] } } }" 

func parseJSON(jsonStr:String) throws -> [AnyObject]? { 

    var brandNameKeys:[AnyObject]? 
    let jsonData = jsonStr.dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: false) 

    let json = try NSJSONSerialization.JSONObjectWithData(jsonData!, options: NSJSONReadingOptions()) 

    if let brandNameDict = json["Snuses"]!?["Brands"] as? NSDictionary 
    { 
     brandNameKeys = brandNameDict.allKeys 
    } 

    return brandNameKeys 
} 

if let result = try parseJSON(jsonStr) 
{ 
    print(result) 
} 

在我的遊樂場這個輸出["CATCH", "GENERAL"]我認爲這是你想要的。

這裏是一個完整的UITableViewController演示使用的解決方案：

import UIKit 

class TableViewController: UITableViewController { 

    var data:[AnyObject]? 

    override func viewDidLoad() { 
     super.viewDidLoad() 

     if let path: String = NSBundle.mainBundle().pathForResource("Data", ofType: "json") 
     { 
      do 
      { 
       let jsonStr = try String(contentsOfFile: path) 
       data = try parseJSONStr(jsonStr) 
      } 
      catch _ { 
       print("Loading json failed") 
      } 
     } 
    } 


    // JSON Parsing 
    func parseJSONStr(jsonStr:String) throws -> [AnyObject]? { 

     var brandNameKeys:[AnyObject]? 
     let jsonData = jsonStr.dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: false) 

     let json = try NSJSONSerialization.JSONObjectWithData(jsonData!, options: NSJSONReadingOptions()) 

     if let brandNameDict = json["Snuses"]!?["Brands"] as? NSDictionary 
     { 
      brandNameKeys = brandNameDict.allKeys 
     } 

     return brandNameKeys 
    } 

    // MARK: - Table view data source 

    override func numberOfSectionsInTableView(tableView: UITableView) -> Int { 
     return 1 
    } 

    override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int { 
     if let data = data 
     { 
      return data.count 
     } 
     else 
     { 
      return 0 
     } 
    } 

    override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell { 
     let cell = tableView.dequeueReusableCellWithIdentifier("SampleCell", forIndexPath: indexPath) 

     if let rowData = data![indexPath.row] as? String 
     { 
      cell.textLabel?.text = rowData 
     } 

     return cell 
    } 
}