问题
I'm getting record from server using php
As i'm getting 11 record currently so i want in starting i will show just 6 records and remaining next 5 record will show when user reached at last cell while scrolling. So this process is in working form, but the problem is while running, it working so fast that before reaching last row all records are already showing while scrolling and the activity indicator is just animating at the bottom of tableView.
I don't know what is the problem.
Also i want when user reached at last cell, activity indicator start animating while loading data .
Here is my code
import UIKit
import AlamofireImage
struct property{
let property_Id : String
let propertyTitle : String
let imageURL : String
let user_Id : String
let area : String
let bed : String
let unit : String
let bath : String
let price : String
}
class searchRecordsViewController: UIViewController, UITableViewDelegate, UITableViewDataSource,favouriteButtonTableViewCellDelegate {
var y = 6
var m = 12
@IBOutlet weak var tableView : UITableView!
var RESULT : [NSDictionary] = []
var myProperty = [property]()
var myPropertyCopy = [property]()
override func viewDidLoad() {
super.viewDidLoad()
tableView.delegate = self
tableView.dataSource = self
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
//MARK: Getting dictionary data from previous controller
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
self.navigationItem.title = "Results"
self.navigationController?.navigationBar.tintColor = UIColor.black
//MARK: Getting dictionary data from previous controller
for item in RESULT {
let propertyInfo = property(property_Id: String(item["propertyId"]! as! Int), propertyTitle: item["propertyTitle"]! as! String, imageURL: item["imagePath"]! as! String, user_Id: String(item["userId"]! as! Int), area: item["area"]! as! String, bed: item["bed"]! as! String, unit: item["unit"]! as! String, bath: item["bath"]! as! String, price: item["price"]! as! String )
myProperty.append(propertyInfo)
}
//MARK: Inserting first 6 records in Array
for i in 0 ..< 6 {
if !(myProperty.indices.contains(i)) {
break
}
myPropertyCopy.append(myProperty[i])
}
}
func downloadImage(imagePath : String, theIMAGEVIEW : UIImageView) {
let myUrl = URL(string: URL_IP+imagePath);
//MARK: AlamofireImage to download the image
theIMAGEVIEW.af_setImage(withURL: myUrl!, placeholderImage: #imageLiteral(resourceName: "addProperty"), filter: nil, progress: nil, runImageTransitionIfCached: true, completion: nil)
}
func tableView(_ tableView:UITableView, numberOfRowsInSection section:Int) -> Int
{
return myPropertyCopy.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell
{
let cell = tableView.dequeueReusableCell(withIdentifier: "RecordCell") as! searchrecordsTableViewCell
let property = myPropertyCopy[indexPath.row]
cell.area.text = property.area+" "+property.unit
if property.bath == ""{
cell.bath.text = property.bath
}
else{
cell.bath.text = property.bath+" Baths"
}
if property.bed == ""{
cell.bed.text = property.bed
}
else{
cell.bed.text = property.bed+" Baths"
}
cell.propertyTitle.text = property.propertyTitle
cell.price.text = convertAMOUNT(price : property.price)
downloadImage(imagePath: property.imageURL, theIMAGEVIEW: cell.myImageView)
//----
cell.delegate = self
return cell
}
func tableView(_ tableView: UITableView, willDisplay cell: UITableViewCell, forRowAt indexPath: IndexPath) {
if myPropertyCopy.count != myProperty.count{
let lastRow = myPropertyCopy.count - 1
if indexPath.row == lastRow {
let spinner = UIActivityIndicatorView(activityIndicatorStyle: .gray)
spinner.startAnimating()
spinner.frame = CGRect(x: CGFloat(0), y: CGFloat(0), width: tableView.bounds.width, height: CGFloat(44))
self.tableView.tableFooterView = spinner
self.tableView.tableFooterView?.isHidden = false
moreData()
}
}
}
func moreData(){
for i in y ..< m {
if !(myProperty.indices.contains(i)) {
break
}
myPropertyCopy.append(myProperty[i])
}
y = y + 10
m = m + 10
self.tableView.reloadData()
}
}
currently my TableView looks like See output here
Thanks in Advance.
回答1:
After a long practice i have done my problem, i have just added UIScrollView delegate function for checking if the user reached at last cell then start activityIndicator for 3 seconds and then load data and that's it.
As i have just very small amount of data that's why i'm start ing UIactivityIndicator for 3 seconds before getting data.
func scrollViewDidEndDragging(_ scrollView: UIScrollView, willDecelerate decelerate: Bool) {
// UITableView only moves in one direction, y axis
let currentOffset = scrollView.contentOffset.y
let maximumOffset = scrollView.contentSize.height - scrollView.frame.size.height
if maximumOffset - currentOffset <= 10.0 {
let spinner = UIActivityIndicatorView(activityIndicatorStyle: .gray)
if myPropertyCopy.count != myProperty.count {
//print("this is the last cell")
spinner.startAnimating()
spinner.frame = CGRect(x: CGFloat(0), y: CGFloat(0), width: tableView.bounds.width, height: CGFloat(44))
spinner.hidesWhenStopped = true
self.tableView.tableFooterView = spinner
self.tableView.tableFooterView?.isHidden = false
DispatchQueue.main.asyncAfter(deadline: .now() + 3) {
//MARK: Loading more data
self.moreData()
}
}
else{
self.tableView.tableFooterView?.isHidden = true
spinner.stopAnimating()
}
}
}
来源：https://stackoverflow.com/questions/50492284/issue-with-activity-indicator-while-loading-data-in-uitableview