使用Swift在TableView中显示JSON数据 [英] Show JSON data in a TableView with Swift

问题描述

我正在尝试显示从数据库中获取的一些数据到TableView中，但该数据未显示在TableView中.我收到的数据采用JSON格式.

I am trying to display some data I take from a data base into a TableView but the data is not shown in the TableView. The data I receive is formatted in JSON.

这是我从数据库收到的数据，我想在TableView中打印的只是David:

This is the data I receive form the data base and what I want to print in the TableViewis just David:

{"name":"David"}

这是从数据库中获取数据的代码:

This is the code to get the data from de data base:

let session = NSURLSession.sharedSession()
    let request = NSURLRequest(URL: NSURL(string: "http://localhost:8888/Patients.php")!)
    let task = session.dataTaskWithRequest(request) {data, response, downloadError in

        if let error = downloadError {
            print("Could not complete the request \(error)")
        }
        else {

            do {
                self.json = try NSJSONSerialization.JSONObjectWithData(data!, options: NSJSONReadingOptions.AllowFragments)
            } catch {
                fatalError()
            }
            dispatch_async(dispatch_get_main_queue(), {

                if let parseJSON = self.json{

                    let name = parseJSON["name"] as! String

                    self.arrayData.append(name)

                    print("Data1:\(self.arrayData)")
                }

            })
        }
    }
    task.resume()

arrayData是一个array，我将从数据库中接收的数据放入其中，并声明为:

arrayData is an array where I put the data I receive from the data base and it is declared like this:

var arrayData: [String] = []

代码

print("Data1:\(self.arrayData)")

在控制台中显示此Data1:["David"]，所以我可以正确获取数据.

show in the console this Data1:["David"], so I get the data correctly.

然后，我实现了要在"TableView"，numberOfSectionsInTableView方法，numberOfRowsInSection方法和cellForRowAtIndexPath方法中打印的方法，但是数据没有在TableView中打印.

Then I implement the methods to print in the ´TableView´, the numberOfSectionsInTableViewmethod, the numberOfRowsInSection method and the cellForRowAtIndexPath method but the data is not printed in the TableView.

我认为问题在于TableView是在将数据放入array之前绘制的，因此它不打印任何内容，因为数组为空，而且我不知道如何解决它.

I think the problem is that the TableViewis drawn before I put the data in the array so it prints nothing because the array is empty, and I don´t know how to fix it.

任何人都知道我的问题是什么?

Anyone knows what is my problem?

推荐答案

是的，您是对的.

session.dataTaskWithRequest

session.dataTaskWithRequest

是异步的.数据不会立即返回，它会延迟. 您必须在收到数据后重新加载tableview:

is async. Data is not returned immediately, it have delay. You must to reload tableview after recieved data:

self.arrayData.append(name)
self.tableview.reloadData()

通常，我将使用块:

func getData(handleComplete:((arr:NSMutableArray)->())){
    let aray = NSMutableArray()
    let session = NSURLSession.sharedSession()
    let request = NSURLRequest(URL: NSURL(string: "http://localhost:8888/Patients.php")!)
    let task = session.dataTaskWithRequest(request) {data, response, downloadError in

        if let error = downloadError {
            print("Could not complete the request \(error)")
        }
        else {

            do {
                self.json = try NSJSONSerialization.JSONObjectWithData(data!, options: NSJSONReadingOptions.AllowFragments)
            } catch {
                fatalError()
            }
            dispatch_async(dispatch_get_main_queue(), {

                if let parseJSON = self.json{

                    let name = parseJSON["name"] as! String

                    aray.append(name)

                    print("Data1:\(self.arrayData)")
                }
                handleComplete(aray)

            })
        }
    }
    task.resume()
    arrayData
}

在viewdidload中，我将调用:

and in viewdidload i will call:

override func viewDidLoad() {
    super.viewDidLoad()
    self.getData { (arr) -> () in
        self.tableview.reloadData()
    }
}

更好

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