How to refresh table view on button click

Question

I want to change the url of an nsurlsession call on click of a button and refresh the tableView immediately here is what i have so far

    @IBAction func d(sender: AnyObject) {

    url = NSURL(string: "http://www.json-generator.com/api/json/get/coDxrSkrNe?indent=2")!

    NSURLSession.sharedSession().dataTaskWithURL(url) { (data, response, error) in
        if error != nil {
            print(error!)
        } else {
            do {
                if let restaurants = try NSJSONSerialization.JSONObjectWithData(data!, options: []) as? [[String:AnyObject]] {



                    let names = restaurants.flatMap { $0["preferred_name"] as? String }
                    let time = restaurants.flatMap { $0["cooking_time"] as? String }


                    for restaurant in restaurants {
                        if let name = restaurant["preferred_name"] as? String {
                            let cookingTime = ""
                            let food = Food(name: name, time:cookingTime)
                            self.food.append(food)
                        }
                    }



                    dispatch_async(dispatch_get_main_queue()) {
                        self.tableView.reloadData()

                    }

                    print(names)
                }
            } catch let error as NSError {
                print(error)
            }
        }
        }.resume()

    self.tableView.reloadData()


}

Here is what my code looks like now but the tableView is still not reloading or changing the data after clicking the button

You have it right, but you need to call `reloadData` when you get your response back from the server. — Harsh, Aug 11 '16 at 00:39
What problem are you having with the posted code? FYI - there is no reason to use `dispatch_async` here. Your `d` function will only be called on the main thread. — rmaddy, Aug 11 '16 at 00:42
@Harsh yes i called reloadData after the response but the tableView wont still change the data — Shaggy1_0, Aug 11 '16 at 00:45
Is the call to `reloadData` being reached? And why do you expect to see any changes anyway? You haven't updated anything about the datasource. — rmaddy, Aug 11 '16 at 00:46
Can i update this from the function f because i already called cellForRowAtIndex — Shaggy1_0, Aug 11 '16 at 00:50
Simply setting `url` doesn't do anything. You need code that accesses that URL and processes the results and then updates the data used to populate the table view. Then you should call `reloadData`. — rmaddy, Aug 11 '16 at 00:50
Ok so basically i can create annother function to make another nsurlsession call — Shaggy1_0, Aug 11 '16 at 00:53
Yes, make function to get the data from the server with the URL you updated. On completion of your request, update the data source for table view and then `reloadData` — Harsh, Aug 11 '16 at 00:54

score 0 · Answer 1 · edited May 23 '17 at 12:14

0

https://github.com/harsh62/stackoverflow_insert_dynamic_rows

I have created a dummy project, click on refresh and see that the data is added to the table View. I have used the same function which you created but added to my own data source. The only new thing i had to do was to allow arbitrary loads for the project.

If your app (a third-party web browser, for instance) needs to load arbitrary content, Apple provides a way to disable ATS altogether, but I suspect it’s wise for you to use this capability sparingly:

<key>NSAppTransportSecurity</key>
<dict>
  <!--Include to allow all connections (DANGER)-->
  <key>NSAllowsArbitraryLoads</key>
      <true/>
</dict>

If you are facing something like this then here is another place which you can checkout Transport security has blocked a cleartext HTTP

Reinitialize the array like this.

self.names = [];
for restaurant in restaurants {
    if let name = restaurant["preferred_name"] as? String {
        self.names.append(name)
    }
}

edited May 23 '17 at 12:14

Community

1
1

answered Aug 11 '16 at 02:16

Harsh

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lol.. sorry about that. forgot to push the changes. Done now. – Harsh Aug 11 '16 at 02:22
It is inserting new rows i want to replace it with the new content not add the new content – Shaggy1_0 Aug 11 '16 at 02:29
If you check i am inserting it deliberately to show you that the tableView is reloading itself. – Harsh Aug 11 '16 at 02:30
So how can i get this to replace the data there before – Shaggy1_0 Aug 11 '16 at 02:31
In the sample project, I have used `self.names.append(name)`. Instead of this, create a new `Array`, add your data coming from the server and then assign it to `self.food` in your case. – Harsh Aug 11 '16 at 02:34
If i want to remove the old array and replace with the new one – Shaggy1_0 Aug 11 '16 at 02:38
Yeah. it's pretty straight forward. May be the table view is reloading itself but there is no new data to see. – Harsh Aug 11 '16 at 02:39
Ok so now each time i click the button new data is poped to the bottom of the table but what i want is to remove the old data and replace it with the new ones coming in – Shaggy1_0 Aug 11 '16 at 02:43
` self.names = []; for restaurant in restaurants { if let name = restaurant["preferred_name"] as? String { self.names.append(name) } }` Use it like this. reinitialize the array. – Harsh Aug 11 '16 at 02:48
How can i contact u if i have any issue – Shaggy1_0 Aug 11 '16 at 02:52
Great. You can accept the answer and close this thread. Lots of comments. And yeah you can contact me on my email. harsh.batth@gmail.com – Harsh Aug 11 '16 at 02:54
I just followed u on github – Shaggy1_0 Aug 11 '16 at 02:55
Am unable to accept answer seems my reputation is too low – Shaggy1_0 Aug 11 '16 at 02:57

How to refresh table view on button click

1 Answers1