EdouM EdouM - 5 months ago 8
Swift Question

Go to next cell of a table view from the viewcontroller

I have a question regarding a Swift project.
I have a

TableViewController
with multiple cells, and when I click on them I go to a
ViewController
where data is passed from the
tableViewController
.

I want to implement a button in the
ViewController
that allows me to display the
ViewController
with the content of the "next cell" from the table view controller. For instance, I clicked on the 2nd cell of the table view controller, so I go to the
ViewController
that displays the data corresponding to that cell, and then when I click on that "next" button in the
viewController
I want to display the content of the 3rd cell of the table view controller. How do I do that in a clean way?

Here is the code I use to pass the data from
tableViewController
to
ViewController
:

override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
if let a = articles {
return a.count
}
return 0
}

override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) ->UITableViewCell{
let cell = tableView.dequeueReusableCellWithIdentifier("ArticleCell", forIndexPath: indexPath)

let article = articles?[indexPath.row]

if let a = article {
cell.textLabel?.text = a.articleName
cell.textLabel?.font = UIFont(name: "Avenir", size: 18)
cell.textLabel?.numberOfLines = 0
if let i = a.tableViewImage {
cell.imageView?.image = UIImage(named: i)
}

}

return cell
}

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if segue.identifier == "ShowArticle" {
let articleVC = segue.destinationViewController as? ArticleViewController

guard let cell = sender as? UITableViewCell,
let indexPath = tableView.indexPathForCell(cell) else {
return
}

articleVC?.article = articles?[indexPath.row]
}

}


In the
viewController
, to show the right article, I wrote this in the
viewDidLoad()
(my
viewController
shows a web view of an article, and I have a class
Article
where
articleLink
comes from):

if let a = article {
articleWebView.loadRequest(NSURLRequest(URL: NSURL(fileURLWithPath: NSBundle.mainBundle().pathForResource(a.articleLink, ofType: "html")!)))
}


I have linked a
nextButton
in
Main.Storyboard
:

@IBOutlet weak var nextButton: UIButton!


I'm relatively new to Swift, and have no idea how to do it (my main problem is because I declare my data in the
tableViewController
, and I don't see how I could stay in the
ViewController
and "import" data from the
tableViewController
).

Answer

Change your code of TableViewController's prepareForSegue like this

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    if segue.identifier == "ShowArticle" {
        let articleVC = segue.destinationViewController as? ArticleViewController
        guard let cell = sender as? UITableViewCell, let indexPath = tableView.indexPathForCell(cell) else {
            return
        }
        articleVC?.articles = articles
        articleVC?.selectedIndex = indexPath.row
        articleVC?.article = articles?[indexPath.row]
    }
}

Now add two global variable in your ViewController like below also change your next button click like this

var articles: [article]!
var selectedIndex: Int!

//Now your button click
@IBAction func nextButtonClick(sender: UIButton) {
    if ((self.selectedIndex + 1) < self.articles.count) {
        self.selectedIndex++
        let nextArticle = self.articles[self.selectedIndex]
        articleWebView.loadRequest(NSURLRequest(URL: NSURL(fileURLWithPath: NSBundle.mainBundle().pathForResource(nextArticle.articleLink, ofType: "html")!)))
    }
}

I don't know you are using NSArray or Array so create the articles array object same as you created in TableViewController.

Hope this will help you.