In this video tutorial I am going to share with you how to create a UISegmentedControl with three tabs which will allow user to switch between three different list of elements: Private, Protected and Public. List of items displayed in each tab is loaded from a remote PHP script. I will include the source of PHP script below in this blog post.
If you would like to learn how to load list of items from a locally created(hard coded) array of elements, watch this video: UISegmentedControl with UITableView example in Swift. Part 1.
Source code of UIViewController:
import UIKit
class ViewController: UIViewController, UITableViewDataSource,UITableViewDelegate {
@IBOutlet weak var mySegmentedControl: UISegmentedControl!
@IBOutlet weak var myTableView: UITableView!
@IBOutlet weak var myActivityIndicator: UIActivityIndicatorView!
var privateList:[String] = []
var friendsAndFamily:[String] = []
var publicList:[String] = []
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
override func viewWillAppear(animated: Bool) {
super.viewWillAppear(animated)
loadItems()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
internal func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int
{
var returnValue = 0
switch(mySegmentedControl.selectedSegmentIndex)
{
case 0:
returnValue = privateList.count
break
case 1:
returnValue = friendsAndFamily.count
break
case 2:
returnValue = publicList.count
break
default:
break
}
return returnValue
}
internal func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell
{
let myCell = tableView.dequeueReusableCellWithIdentifier("myCell", forIndexPath: indexPath)
switch(mySegmentedControl.selectedSegmentIndex)
{
case 0:
myCell.textLabel!.text = privateList[indexPath.row]
break
case 1:
myCell.textLabel!.text = friendsAndFamily[indexPath.row]
break
case 2:
myCell.textLabel!.text = publicList[indexPath.row]
break
default:
break
}
return myCell
}
@IBAction func refreshButtonTapped(sender: AnyObject) {
loadItems()
}
@IBAction func segmentedControlActionChanged(sender: AnyObject) {
switch(mySegmentedControl.selectedSegmentIndex)
{
case 0:
if(privateList.count == 0)
{
loadItems()
} else {
myTableView.reloadData()
}
break
case 1:
if(friendsAndFamily.count == 0)
{
loadItems()
} else {
myTableView.reloadData()
}
break
case 2:
if(publicList.count == 0)
{
loadItems()
} else {
myTableView.reloadData()
}
break
default:
break
}
}
internal func tableView(tableView: UITableView, estimatedHeightForHeaderInSection section: Int) -> CGFloat
{
return 0.0
}
func loadItems()
{
switch(mySegmentedControl.selectedSegmentIndex)
{
case 0:
loadItemsNow("privateList")
break
case 1:
loadItemsNow("protectedList")
break
case 2:
loadItemsNow("publicList")
break
default:
break
}
}
func loadItemsNow(listType:String){
myActivityIndicator.startAnimating()
let listUrlString = "https://www.swiftdeveloperblog.com/my-list-of-items?listType=" + listType + "&t=" + NSUUID().UUIDString
let myUrl = NSURL(string: listUrlString);
let request = NSMutableURLRequest(URL:myUrl!);
request.HTTPMethod = "GET";
let task = NSURLSession.sharedSession().dataTaskWithRequest(request) {
data, response, error in
if error != nil {
print(error!.localizedDescription)
dispatch_async(dispatch_get_main_queue(),{
self.myActivityIndicator.stopAnimating()
})
return
}
do {
let json = try NSJSONSerialization.JSONObjectWithData(data!, options: .MutableContainers) as? NSArray
if let parseJSON = json {
if(listType == "privateList")
{
self.privateList = parseJSON as! [String]
} else if(listType == "protectedList")
{
self.friendsAndFamily = parseJSON as! [String]
} else {
self.publicList = parseJSON as! [String]
}
}
} catch {
print(error)
}
dispatch_async(dispatch_get_main_queue(),{
self.myActivityIndicator.stopAnimating()
self.myTableView.reloadData()
})
}
task.resume()
}
}
Source code of PHP script:
header("Cache-Control: no-store, no-cache, must-revalidate, max-age=0");
header("Cache-Control: post-check=0, pre-check=0", false);
header("Pragma: no-cache");
if($_GET["listType"] == "privateList")
{
$private_list = array();
$private_list[] = "Private item 1";
$private_list[] = "Private item 3";
echo json_encode($private_list);
return;
}
if($_GET["listType"] == "protectedList")
{
$protected_list = array();
$protected_list[] = "Friend item 1";
$protected_list[] = "Friend item 2";
$protected_list[] = "Friend item 3";
$protected_list[] = "Friend item 4";
echo json_encode($protected_list);
return;
}
if($_GET["listType"] == "publicList")
{
$public_list = array();
$public_list[] = "Public item 1";
$public_list[] = "Public item 2";
$public_list[] = "Public item 3";
$public_list[] = "Public item 4";
$public_list[] = "Public item 5";
echo json_encode($public_list);
return;
}