Parse: loadObjects/refreshing the tableview after a pull to refresh - swift

Question

Swift
I'm trying to make it so when you pull to refresh on the tableview it updates the tableview with the data that is stored on Parse.com
I've researched this and it seems I need to use loadObjects()
When I place this in it says: "Use of unresolved identifier 'loadObjects'
Not sure if this is what I need or not..
Here is my ViewController.swift
import UIKit
import Parse
import Bolts
import ParseUI
class EventsViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {
var timer: NSTimer!
var isAnimating = false
var currentColorIndex = 0
var currentLabelIndex = 0
var customView: UIView!
var labelsArray: Array<UILabel> = []
var refreshControl: UIRefreshControl!
var testArray = [String]()
var subArray = [String]()
#IBOutlet weak var tableview: UITableView!
#IBOutlet weak var webView: UIWebView!
override func viewDidLoad() {
super.viewDidLoad()
tableview.delegate = self
tableview.dataSource = self
refreshControl = UIRefreshControl()
tableview.addSubview(refreshControl)
loadCustomRefreshContents()
//refreshControl colors
refreshControl.backgroundColor = UIColor.clearColor() //color of background
refreshControl.tintColor = UIColor.clearColor() //color of indicator
let query = PFQuery(className: "events")
let runkey = query.orderByDescending("eventTitle")
runkey.findObjectsInBackgroundWithBlock {
(objects: [PFObject]?, error:NSError?) -> Void in
if error == nil {
if let objects = objects as [PFObject]! {
for object in objects {
let load = object.objectForKey("eventTitle") as! String
self.testArray.append(load)
let subload = object.objectForKey("date") as! String
self.subArray.append(subload)
print(self.testArray)
}
}
} else {
print("error:\(error!) \(error!.userInfo)")
}
}
sleep(3)
do_table_refresh()
loadViewIfNeeded()
loadObjects()
/*let url = NSURL(string: "https://m.facebook.com/CathedralCityMunicipal")
let task = NSURLSession.sharedSession().dataTaskWithURL(url!) {
(data, response, error) in
if error == nil {
let urlContent = NSString(data: data!, encoding: NSUTF8StringEncoding)
print(urlContent)
dispatch_async(dispatch_get_main_queue()) {
self.webView.loadHTMLString(urlContent! as String, baseURL: nil)
}
}
}
task.resume()*/
// Do any additional setup after loading the view.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func do_table_refresh() {
dispatch_async(dispatch_get_main_queue()) {
self.tableview.reloadData()
return
}
}
func tableView(tableView:UITableView!, numberOfRowsInSection section:Int) -> Int {
return testArray.count
}
func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return 1
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("eventcell", forIndexPath: indexPath) as! EventTableViewCell
cell.title.text = self.testArray[indexPath.row]
cell.subTitle.text = self.subArray[indexPath.row]
return cell
}
//refreshes tableview; starts refresh
func loadCustomRefreshContents() {
let refreshContents = NSBundle.mainBundle().loadNibNamed("RefreshControl", owner: self, options: nil)
customView = refreshContents[0] as! UIView
customView.frame = refreshControl.bounds
for var i=0; i<customView.subviews.count; ++i {
labelsArray.append(customView.viewWithTag(i + 1) as! UILabel)
}
refreshControl.addSubview(customView)
do_table_refresh()
}
//stops refresh
func scrollViewDidEndDecelerating(scrollView: UIScrollView) {
do_table_refresh()
if refreshControl.refreshing {
if !isAnimating {
doSomething()
animateRefreshStep1()
self.do_table_refresh()
}
}
}
//cycles through colors
func getNextColor() -> UIColor {
var colorsArray: Array<UIColor> = [UIColor.magentaColor(), UIColor.brownColor(), UIColor.yellowColor(), UIColor.redColor(), UIColor.greenColor(), UIColor.blueColor(), UIColor.orangeColor()]
if currentColorIndex == colorsArray.count {
currentColorIndex = 0
}
let returnColor = colorsArray[currentColorIndex]
++currentColorIndex
return returnColor
}
func doSomething() {
timer = NSTimer.scheduledTimerWithTimeInterval(4.0, target: self, selector: "endOfWork", userInfo: nil, repeats: true)
self.do_table_refresh()
}
func endOfWork() {
refreshControl.endRefreshing()
self.do_table_refresh()
timer.invalidate()
timer = nil
}
//first part of animation
func animateRefreshStep1() {
isAnimating = true
UIView.animateWithDuration(0.1, delay: 0.0, options: UIViewAnimationOptions.CurveLinear, animations: { () -> Void in
self.labelsArray[self.currentLabelIndex].transform = CGAffineTransformMakeRotation(CGFloat(M_PI_4))
self.labelsArray[self.currentLabelIndex].textColor = self.getNextColor()
}, completion: { (finished) -> Void in
UIView.animateWithDuration(0.05, delay: 0.0, options: UIViewAnimationOptions.CurveLinear, animations: { () -> Void in
self.labelsArray[self.currentLabelIndex].transform = CGAffineTransformIdentity
self.labelsArray[self.currentLabelIndex].textColor = UIColor.blackColor()
}, completion: { (finished) -> Void in
++self.currentLabelIndex
if self.currentLabelIndex < self.labelsArray.count {
self.animateRefreshStep1()
}
else {
self.animateRefreshStep2()
}
})
})
}
//second part of animation
func animateRefreshStep2() {
UIView.animateWithDuration(0.35, delay: 0.0, options: UIViewAnimationOptions.CurveLinear, animations: { () -> Void in
self.labelsArray[0].transform = CGAffineTransformMakeScale(1.5, 1.5)
self.labelsArray[1].transform = CGAffineTransformMakeScale(1.5, 1.5)
self.labelsArray[2].transform = CGAffineTransformMakeScale(1.5, 1.5)
self.labelsArray[3].transform = CGAffineTransformMakeScale(1.5, 1.5)
self.labelsArray[4].transform = CGAffineTransformMakeScale(1.5, 1.5)
self.labelsArray[5].transform = CGAffineTransformMakeScale(1.5, 1.5)
self.labelsArray[6].transform = CGAffineTransformMakeScale(1.5, 1.5)
self.labelsArray[7].transform = CGAffineTransformMakeScale(1.5, 1.5)
self.labelsArray[8].transform = CGAffineTransformMakeScale(1.5, 1.5)
self.labelsArray[9].transform = CGAffineTransformMakeScale(1.5, 1.5)
}, completion: { (finished) -> Void in
UIView.animateWithDuration(0.25, delay: 0.0, options: UIViewAnimationOptions.CurveLinear, animations: { () -> Void in
self.labelsArray[0].transform = CGAffineTransformIdentity
self.labelsArray[1].transform = CGAffineTransformIdentity
self.labelsArray[2].transform = CGAffineTransformIdentity
self.labelsArray[3].transform = CGAffineTransformIdentity
self.labelsArray[4].transform = CGAffineTransformIdentity
self.labelsArray[5].transform = CGAffineTransformIdentity
self.labelsArray[6].transform = CGAffineTransformIdentity
self.labelsArray[7].transform = CGAffineTransformIdentity
self.labelsArray[8].transform = CGAffineTransformIdentity
self.labelsArray[9].transform = CGAffineTransformIdentity
}, completion: { (finished) -> Void in
if self.refreshControl.refreshing {
self.currentLabelIndex = 0
self.animateRefreshStep1()
}
else {
self.isAnimating = false
self.currentLabelIndex = 0
for var i=0; i<self.labelsArray.count; ++i {
self.labelsArray[i].textColor = UIColor.blackColor()
self.labelsArray[i].transform = CGAffineTransformIdentity
}
}
})
})
}
/*
// MARK: - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
// Get the new view controller using segue.destinationViewController.
// Pass the selected object to the new view controller.
}
*/
}
I have tried letting the do_table_refresh() function run after the refresh is over, but the tableview does not update. I have also tried using self.tableview.reloadData() but also does not work.
I'm not sure what I am doing wrong, any help is greatly appreciated!
Feel free to ask me for any additional information!
Thank you for your time!

Answer 1

So, if you are trying to get the Parse data everytime you to pull-to-refresh you should query for them always.
Keep your query into a single function and call a tableView.reloadData() so it will reload the tableView every time you query your events:
func loadEvents () -> Void {
self.testArray = []
self.subArray = []
let query = PFQuery(className: "events")
let runkey = query.orderByDescending("eventTitle")
runkey.findObjectsInBackgroundWithBlock {
(objects: [PFObject]?, error:NSError?) -> Void in
if error == nil {
if let objects = objects as [PFObject]! {
for object in objects {
let load = object.objectForKey("eventTitle") as! String
self.testArray.append(load)
let subload = object.objectForKey("date") as! String
self.subArray.append(subload)
//reload TableView
self.tableView.reloadData()
print(self.testArray)
}
}
} else {
print("error:\(error!) \(error!.userInfo)")
}
}
refreshControl.endRefreshing()
}
And then add a Target for your UIRefreshControl inside your ViewDidLoad()
refreshControl.addTarget(self, action: Selector("loadEvents"), forControlEvents: UIControlEvents.ValueChanged)
self.tableView.addSubview(refreshControl)
Also, you must declare your UIRefreshControl as follows:
var refreshControl = UIRefreshControl()