仅在 Json Swift 3 中附加数组的第一项

Posted 2023-02-24

【中文标题】仅在 Json Swift 3 中附加数组的第一项

【英文标题】：Append only the first item of an Array inside Json Swift 3

【发布时间】：2016-10-18 14:20:22

【问题描述】：

我正在使用 Alamofire 和 SwiftyJSON 来解析 JSON 中的一些数据，但我有一个理解问题。 所以这是 JSON

  "data" : [
    
      "images" : [
        
          "source" : "https:\/\/scontent.xx.fbcdn.net\/v\/t1.0-9\/14680504_1200113096725648_1728625782476314570_n.jpg?oh=a20884ad66bef170b7afa9d4f109abf1&oe=585F830B",
          "width" : 349,
          "height" : 557
        ,
        
          "source" : "https:\/\/scontent.xx.fbcdn.net\/v\/t1.0-0\/p320x320\/14680504_1200113096725648_1728625782476314570_n.jpg?oh=effc78bc088150bc762a79d7b0cfad6c&oe=5860B857",
          "width" : 320,
          "height" : 510
        ,
        
          "source" : "https:\/\/scontent.xx.fbcdn.net\/v\/t1.0-0\/p180x540\/14680504_1200113096725648_1728625782476314570_n.jpg?oh=e014f2b98eb8152dbfd84b6fdfefc25b&oe=58913E1C",
          "width" : 338,
          "height" : 540
        ,
        
          "source" : "https:\/\/scontent.xx.fbcdn.net\/v\/t1.0-0\/p130x130\/14680504_1200113096725648_1728625782476314570_n.jpg?oh=ce0430df1e0e605b2b33542634b70adb&oe=58A3A2B0",
          "width" : 130,
          "height" : 207
        ,
        
          "source" : "https:\/\/scontent.xx.fbcdn.net\/v\/t1.0-0\/p75x225\/14680504_1200113096725648_1728625782476314570_n.jpg?oh=18ed8685d773104637f8a747b21783af&oe=58689107",
          "width" : 140,
          "height" : 225
        
      ],
      "id" : "1200113096725648"
    ,
    
      "images" : [
        
          "source" : "https:\/\/scontent.xx.fbcdn.net\/v\/t1.0-9\/14732411_1196819920388299_7949002046479842067_n.jpg?oh=7b7a61f956594f0015dea746640f3e33&oe=589B36EA",
          "width" : 294,
          "height" : 171
        ,
        
          "source" : "https:\/\/scontent.xx.fbcdn.net\/v\/t1.0-0\/p130x130\/14732411_1196819920388299_7949002046479842067_n.jpg?oh=fe74c57b606ef817aed805707fe6fe6d&oe=58A96851",
          "width" : 223,
          "height" : 130
        
      ],
      "id" : "1196819920388299"
    ,
    
      "images" : [
        
          "source" : "https:\/\/scontent.xx.fbcdn.net\/t31.0-8\/14753242_1194616067275351_4639120157874462599_o.jpg",
          "width" : 1920,
          "height" : 1200
        ,
        
          "source" : "https:\/\/scontent.xx.fbcdn.net\/t31.0-8\/p960x960\/14753242_1194616067275351_4639120157874462599_o.jpg",
          "width" : 1536,
          "height" : 960
        ,
        
          "source" : "https:\/\/scontent.xx.fbcdn.net\/t31.0-8\/p720x720\/14753242_1194616067275351_4639120157874462599_o.jpg",
          "width" : 1152,
          "height" : 720
        ,
        
          "source" : "https:\/\/scontent.xx.fbcdn.net\/v\/t1.0-9\/14650295_1194616067275351_4639120157874462599_n.jpg?oh=19248c58a8a11a4506b364aa44a7dc4a&oe=58A4E3F0",
          "width" : 960,
          "height" : 600
        ,
        
          "source" : "https:\/\/scontent.xx.fbcdn.net\/t31.0-0\/p480x480\/14753242_1194616067275351_4639120157874462599_o.jpg",
          "width" : 768,
          "height" : 480
        ,
        
          "source" : "https:\/\/scontent.xx.fbcdn.net\/v\/t1.0-0\/p320x320\/14650295_1194616067275351_4639120157874462599_n.jpg?oh=672575780d6ec2c46c7fc0b25421941c&oe=589800AC",
          "width" : 512,
          "height" : 320
        ,
        
          "source" : "https:\/\/scontent.xx.fbcdn.net\/t31.0-0\/p180x540\/14753242_1194616067275351_4639120157874462599_o.jpg",
          "width" : 864,
          "height" : 540
        ,
        
          "source" : "https:\/\/scontent.xx.fbcdn.net\/v\/t1.0-0\/p130x130\/14650295_1194616067275351_4639120157874462599_n.jpg?oh=f6441f7dde33aec00785f7f96dea31b5&oe=58A1D94B",
          "width" : 208,
          "height" : 130
        ,
        
          "source" : "https:\/\/scontent.xx.fbcdn.net\/v\/t1.0-0\/p75x225\/14650295_1194616067275351_4639120157874462599_n.jpg?oh=bbe7ab23b13269a062bfcfa0afcce8e1&oe=589A7EFC",
          "width" : 360,
          "height" : 225
        
      ],
      "id" : "1194616067275351"
    
  ],
  "paging" : 
    "cursors" : 
      "after" : "MTE5NDYxNjA2NzI3NTM1MQZDZD",
      "before" : "MTIwMDExMzA5NjcyNTY0OAZDZD"
    
  

这就是我使用 Alamofire 和 SwiftyJSON 获得它的方式

Alamofire.request("https://graph.facebook.com/\(eventId1)/photos", method: .get, parameters: ["fields": "images", "access_token": "token"])
            .responseJSON  (responseData) -> Void in
                if((responseData.result.value) != nil) 
                    let swiftyJsonVar = JSON(responseData.result.value!)
                    print(swiftyJsonVar)

我的问题是，如何在 JSON 中获取每个 images 数组的第一个 source 并将其附加到一个空数组？ 我尝试了几种方法，但它总是在第一个 images 中使用 5 个源。 有什么想法吗？

【参考方案1】：

            if let images = swiftyJsonVar["data"].array 
                for i in 0...images.count-1 
                let source = images[i]["images"][0]["source"].string

                            DispatchQueue.global(qos: DispatchQoS.QoSClass.default).async 
                                if let url  = NSURL(string: source!),

                                    let data = NSData(contentsOf: url as URL)
                                
                                    DispatchQueue.main.async(execute: 
                                        self.sliderPinakas.append(UIImage(data:data as Data)!)

                                        self.makeSlider()
                                    );
                                

                            
                
             else 
                        self.sliderPinakas.append(UIImage(named: "noimageinside")!)

                        self.makeSlider()

            

这比我想象的要容易。 只需将所有数据放入一个数组中，然后在其中循环。