如何將字典值從字典數組中存儲到數組中

Question

我是新來的iOS開發我試圖在swift中顯示數據在tableview中的數據來自webservice爲我使用NSURLSessionDataTask。數據如下所示：

{ categorys: [ 
       { 
       category_id: "all", 
       category_name: "ALL", 
       category_desc: "All Categories" 
       }, 
       { 
       category_id: "1", 
       category_name: "Art", 
       category_desc: "Artffsdfsdfds " 
       }, 
       { 
       category_id: "4", 
       category_name: "Education", 
       category_desc: "Education for children and adults" 
       }] 
    } 

我想在tableview中顯示「category_name」名稱。 下面是我試過的代碼，並試圖在tableview中顯示名稱。

import UIKit 

class ViewController: UIViewController, UITableViewDelegate 
{ 

@IBOutlet var dataTableView: UITableView! 

var items: NSArray = [] 

override func viewDidLoad() 
{ 
    super.viewDidLoad() 
    // Do any additional setup after loading the view, typically from a nib. 
    //table 
    self.dataTableView!.delegate = self 
    self.dataTableView!.registerClass(UITableViewCell.self, forCellReuseIdentifier: "cell") 
    self.view.addSubview(self.dataTableView) 

    getData({data, error -> Void in 
     if (data != nil) 
     { 
      self.items = NSMutableArray(array: data) 
      self.dataTableView!.reloadData() 
     } 
     else 
     { 
      println("api.getData failed") 
      println(error) 
     } 
    }) 

} 

func getData(completionHandler: ((NSArray!, NSError!) -> Void)!) -> Void 
{ 
    let url = NSURL(string: "http://sample.com/srd/games/category")! 
    var request: NSURLRequest = NSURLRequest(URL:url) 
    let config = NSURLSessionConfiguration.defaultSessionConfiguration() 
    let session = NSURLSession(configuration: config) 

    let task = session.dataTaskWithURL(url, completionHandler: {data, response, error -> Void in 

     if (error != nil) 
     { 
      return completionHandler(nil, error) 
     } 

     var error: NSError? 
     let json = NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.MutableContainers, error: &error) as NSDictionary 


     let names = json["categorys"] as NSArray 
     println(names) 

    }) 
    task.resume() 
} 

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

func tableView(tableView: UITableView!, numberOfRowsInSection section: Int) -> Int { 
    return self.items.count; 
} 

func tableView(tableView: UITableView!, cellForRowAtIndexPath indexPath: NSIndexPath!) -> UITableViewCell! 
{ 
    let cell: UITableViewCell = UITableViewCell(style: UITableViewCellStyle.Subtitle, reuseIdentifier: "cell") 

    cell.textLabel.text = self.items[indexPath.row]["categorys"] as? NSString 


    return cell 
} 
} 

Answer 1

希望這可以幫助你。 swift代碼

var dic_categorys : NSDictionary! // original Dictionary 
    // 
    var array_item : NSArray! = dic_categorys.valueForKey("categorys") as NSArray 
    if let array = array_item { 

     var array_list : NSMutableArray! = NSMutableArray(array:array) 
     var array_list_category_name : NSMutableArray = NSMutableArray() 
     // 
     for item in array_list { 
      var dic_item : NSDictionary! = item as NSDictionary 
      if let dic = dic_item { 
       array_list_category_name.addObject(dic.valueForKey("category_name")!) 
      } 
     } 

    }