解析对象数组并填充表格视图单元格 Swift

Question

我有一个应用程序，我试图从我创建的 API 中提取数据（该 API 基于 NODE.js、MongoDB、Express.js )

目前我正在尝试提取对象数组，然后基于该对象数组创建一个表格视图。例如，如果对象数组包含 4 个对象，那么表格视图将有 4 个单元格。在单击一个单元格时，我将转到另一个视图，在那里我可以查看该对象的详细视图。

如何解析从 API 返回的 JSON 数据并填充表格视图单元格？

我的问题：

目前我无法解析返回的对象数组。下面是返回的 JSON 包含的图像：

错误：

我收到以下错误：

Error could not parse JSON: Optional([
    {
       "_id": "55d1db984f80687875e43f89",
       "password": "$2a$08$OQB/r9iIZdSFlN9L5vaiE.qILB8gP/YtlsA3S41usVnM/eXHBW9j6",
       "email": "syed.kazmi26@gmail.com",
       "__v": 0,
       "sector": "Manufacturing",
       "jobTitle": "Something 1",
       "employeeName": "Something 1"
    },

   // it displays all the data being returned in JSON response

   ])

以下是我的 SWIFT 代码：

  import UIKit

  class SectorViewController: UIViewController {

  @IBAction func getManufacturingBios(sender: AnyObject) {

    var request = NSMutableURLRequest(URL: NSURL(string: "https://myURL/user/all")!)
    var session = NSURLSession.sharedSession()
    request.HTTPMethod = "GET"
    UIApplication.sharedApplication().networkActivityIndicatorVisible = true

    var err: NSError?

    request.addValue("application/json", forHTTPHeaderField: "Content-Type")
    request.addValue("application/json", forHTTPHeaderField: "Accept")

    var task = session.dataTaskWithRequest(request, completionHandler: {data, response, error -> Void in
        println("Response: \(response)")

        var strData = NSString(data: data, encoding: NSUTF8StringEncoding)

        println("Body: \(strData)")
        var err: NSError?
        var json = NSJSONSerialization.JSONObjectWithData(data, options: .MutableLeaves, error: &err) as? NSDictionary

        UIApplication.sharedApplication().networkActivityIndicatorVisible = true

        // Did the JSONObjectWithData constructor return an error? If so, log the error to the console
        if(err != nil) {

            println(err!.localizedDescription)
            let jsonStr = NSString(data: data, encoding: NSUTF8StringEncoding)
            println("Error could not parse JSON: '\(jsonStr)'")
            }

        else {

            UIApplication.sharedApplication().networkActivityIndicatorVisible = false
            // The JSONObjectWithData constructor didn't return an error. But, we should still
            // check and make sure that json has a value using optional binding.

            if let parseJSON = json {

            // Okay, the parsedJSON is here, let's get the value for 'success' out of it

                var sector = parseJSON["sector"] as! String
                println("Succes: \(sector)")  

            }
            else {
                // Woa, okay the json object was nil, something went worng. Maybe the server isn't running?
                let jsonStr = NSString(data: data, encoding: NSUTF8StringEncoding)
                println("Error could not parse JSON: \(jsonStr)")

            }
        }
    })

    task.resume()
}
}

Answer 1

也许您可以尝试使用 NSArray 而不是 Dictionary 并更改阅读选项。我会建议做某事。像这样：

var json : NSArray? = nil    
json = (NSJSONSerialization.JSONObjectWithData(data, options:NSJSONReadingOptions.MutableContainers , error: &error) as? NSArray)!

希望能解决您的问题。

Answer 2

代替

var json = NSJSONSerialization.JSONObjectWithData(data, options: .MutableLeaves, error: &err) as? NSDictionary

应该是

var json = NSJSONSerialization.JSONObjectWithData(data, options: .MutableLeaves, error: &err) as? NSArray

因为您的响应内容是一个以 [ 开头的数组，实际上它的元素是 NSDictionary 类型。 如果是 [ 或 { ，请始终查找起始大括号。

JSON 数组以方括号开始和结束，JSON 字典以花括号开始和结束。