CODEWITHSUNDEEP
swiftxcodeuitableview
osama makki
osama makki

Reputation: 373

UITableView load more when scrolling to bottom

I would like to load more data and create additional cells when the user scrolls to the bottom of the table. I'm using JSON data and MySql.

func dataJsonFromURL(url:String)->NSArray
{
    if let data = NSData(contentsOfURL: NSURL(string: url)!) {
        return ((try! NSJSONSerialization.JSONObjectWithData(data, options: [])) as! NSArray)
    }
    else{
        return data
    }
}

func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell
{
    let cell = tableView.dequeueReusableCellWithIdentifier("NCell", forIndexPath: indexPath) as! TableViewCell22

    cell.backgroundColor = UIColor .clearColor()

    let mindata = (data[indexPath.row] as! NSDictionary)
}

Upvotes: 35

Views: 60195

Answers (6)

Abdul Karim
Abdul Karim

Reputation: 4523

Xcode 8, Swift 3

func tableView(_ tableView: UITableView, willDisplay cell: UITableViewCell, forRowAt indexPath: IndexPath) {
    let lastElement = dataSource.count - 1
    if !loadingData && indexPath.row == lastElement {
        indicator.startAnimating()
        loadingData = true
        loadMoreData()
    }
}

Upvotes: 22

Muhammed
Muhammed

Reputation: 586

i used this method and it's works for me 

 func scrollViewDidScroll(scrollView: UIScrollView) {
    let offsetY = scrollView.contentOffset.y
    let contentHeight = scrollView.contentSize.height

    if offsetY > contentHeight - scrollView.frame.size.height {


        loadMoreDataFromServer()
        self.tableView.reloadData()
    }
}

Upvotes: 6

Robert TuanVu
Robert TuanVu

Reputation: 843

you have to use this method

override func tableView(tableView: UITableView, willDisplayCell cell: UITableViewCell, forRowAtIndexPath indexPath: NSIndexPath) {
            let lastElement = dataSource.count - 1
            if indexPath.row == lastElement {
                // handle your logic here to get more items, add it to dataSource and reload tableview
                }    
        }

Upvotes: 62

Casey Wagner
Casey Wagner

Reputation: 1528

You need one very handy delegate method:

func tableView(tableView: UITableView, willDisplayCell cell: UITableViewCell , forRowAtIndexPath indexPath: NSIndexPath) {

}

This method gives your the current displayed row. Use the indexPath it provides to determine when you are nearing the bottom of the table. Then get more JSON and reload the table.

Upvotes: 1

sohan vanani
sohan vanani

Reputation: 1574

Its Called pagination to tableview. Pagination is used to show large data on a table in an effective way. Here's you can get nice tutorial for objective-c and for swift look at this Question.

And you can download example in swift from Here.

Upvotes: 1

Hitendra Solanki
Hitendra Solanki

Reputation: 4941

Use this library. https://github.com/samvermette/SVPullToRefresh

This will full fill your requirements. You just need to change page number or timestamp every time, when new web-service will be called.

Upvotes: -9

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