How to flip the UIView which is inside Tableview in swift

Question

I want flip UIView which is inside tableview if older data is not matched with new data.The UIView is flipping but the issue is when getting more table row then UIView continously flipping.

Struct

struct SMatchOddsData{
    
    var mktId:String
    var runnerName:String
    var back: Double
    var lay: Double
    init(mktId: String, runnerName:String, back: Double, lay: Double) {
        self.mktId = mktId
        self.runnerName = runnerName
        self.back = back
        self.lay = lay
    }
    
}

class smtchOddsData {
    
    var mtchoddsdatas:[SMatchOddsData] = []
    public static let sharedInstance = smtchOddsData()
    
    private init() {
        self.mtchoddsdatas = []
    }
    
    public func add(mktId: String, runnerName:String, back: Double, lay: Double) throws {
        
        mtchoddsdatas.append(SoccerMatchOddsData(mktId: mktId, runnerName:runnerName, back: back, lay: lay))
    }
    
    public func ReplaceAtIndex(Index:Int, mktId: String, runnerName:String, back: Double, lay: Double) throws {
        mtchoddsdatas[Index] = SoccerMatchOddsData(mktId: mktId, runnerName:runnerName, back: back, lay: lay)
    }
    
}

Array and Timer

var timer = Timer()
var mainArray = smtchOddsData.sharedInstance

In viewDidLoad

timer = Timer.scheduledTimer(timeInterval: 1.0, target: self, selector: #selector(LiveViewController.refreshData), userInfo: nil, repeats: true)

MarketList Function

In this api getting market id

func MarketList()
    {
        let params = [String : AnyObject]()
        
        APIClient<MarketList>().API_GET(Url: strUrl, Params: params, Authentication: false, Progress: false, Alert: true, Offline: false, SuperVC: self, completionSuccess: { (resultdata) in
            
            for response in resultdata
            {
               self.OddsInplay(marketId: response.marketID)
            }
        })
        { (error) in
            print(error)
        }
    }

OddInplay Function

In this function im getting all data which I want to display in tableview.

func OddsInplay(marketId:String)
    {
        let params = [String : AnyObject]()
        
        APIClient<OddInplay>().API_GET(Url: strUrl, Params: params, Authentication: false, Progress: false, Alert: true, Offline: false, SuperVC: self, completionSuccess: { (resultdata) in
            
            self.mainArray.mtchoddsdatas.removeAll()
            for i in resultdata.first?.runners ?? []
            {
                try? self.mainArray.add(mktId: marketId, runnerName: i.runnerName ?? "", back: i.exchangePrices?.availableToBack?.first?.price ?? 0.0, lay: i.exchangePrices?.availableToLay?.first?.price ?? 0.0)
            }
            self.isStarted1 = self.isStarted1 + 1
           
            self.ReplaceOddsInplay(marketId:marketId)
            self.marketTableView.reloadData()
        })
        { (error) in
            print(error)
        }
    }

ReplaceOddInplay Function

In this function im replacing old data with new data

func ReplaceOddsInplay(marketId:String)
    {
        let params = [String : AnyObject]()
        
        APIClient<OddInplay>().API_GET(Url: strUrl, Params: params, Authentication: false, Progress: false, Alert: true, Offline: false, SuperVC: self, completionSuccess: { (resultdata) in
  
            for i in resultdata.first?.runners ?? []
            {
                var isMatched = false
                var index = 0
                
                for j in self.mainArray.mtchoddsdatas
                {
                    if j.runnerName == i.runnerName
                    {
                        isMatched = true
                        break;
                    }
                    index = index + 1;
                }
                
                if isMatched == true {
                    
                    try? self.mainArray.ReplaceAtIndex(Index: index, mktId: marketId, runnerName: i.runnerName ?? "", back: i.exchangePrices?.availableToBack?[0].price ?? 0.0, lay: i.exchangePrices?.availableToLay?[0].price ?? 0.0)
                    
                }
            }
            
        })
        { (error) in
            print(error)
        }
    }

TableView

    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
      return mainArray.mtchoddsdatas.count
    
    }

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
            let cell = tableView.dequeueReusableCell(withIdentifier: "matchOddsCell", for: indexPath) as! SoccerMatchOddTableViewCell
                
            let obj = mainArray.mtchoddsdatas[indexPath.row]
               
                
            cell.runnerName.text = obj.runnerName
                
            let newback = String(obj.back)
                   
                if newback == "0.0"
                {
                    cell.backLabel.text = "-"
                }
                else
                {
                    if isStarted1 > 1 && (cell.backLabel.text ?? "" != newback)
                    {
                        UIView.transition(with: cell.backView, duration: 1.0, options: [.transitionFlipFromLeft], animations: nil, completion: nil)
                    }
                    cell.backLabel.text = newback
                }
                
                let newlay = String(obj.lay)
                        
                if newlay == "0.0"
                {
                    cell.layLabel.text = "-"
                }
                else
                {
                    if isStarted1 > 1 && (cell.layLabel.text ?? "" != newlay)
                    {
                        UIView.transition(with: cell.layView, duration: 1.0, options: [.transitionFlipFromLeft], animations: nil, completion: nil)
                    }
                    cell.layLabel.text = "\(newlay)"
                }
           
            return cell
        }

I want to flip UIView only if old data is not equal to new data.

Answer 1

Okay, so my theory is:

cell.layLabel.text ?? "" will always return "" when you call reloadData(). Hence it will always be different than newBack/ newLay.

What you need to do is keep track of your oldLay/ oldBack and check those instead of cell.layLabel.text. Either in an array in the class or new variables in your model.

Try this:

1. Add 2 variables to your class: var oldLays = [String]() & var oldBacks = [String]().

2. Replace your cellForRow with:

   func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "matchOddsCell", for: indexPath) as! SoccerMatchOddTableViewCell
        let oldLay = oldLays.count > indexPath.row ? oldLays[indexPath.row]: ""
         let oldBack = oldBacks.count > indexPath.row ? oldBacks[indexPath.row]: ""
        let obj = mainArray.mtchoddsdatas[indexPath.row]
   
   
        cell.runnerName.text = obj.runnerName
   
        let newback = String(obj.back)
   
        if newback == "0.0"
        {
            cell.backLabel.text = "-"
        }
        else
        {
            if isStarted1 > 1 && (oldBack != newback)
            {
                UIView.transition(with: cell.backView, duration: 1.0, options: [.transitionFlipFromLeft], animations: nil, completion: nil)
            }
            cell.backLabel.text = newback
        }
   
        let newlay = String(obj.lay)
        if newlay == "0.0"
        {
            cell.layLabel.text = "-"
        }
        else
        {
            if isStarted1 > 1 && (oldLay != newlay)
            {
                UIView.transition(with: cell.layView, duration: 1.0, options: [.transitionFlipFromLeft], animations: nil, completion: nil)
            }
            cell.layLabel.text = "\(newlay)"
        }
        if oldLays.count <= indexPath.row {
            oldLays.append("\(obj.lay)")
        }else {
           oldLays[indexPath.row] = "\(obj.lay)"
        }
        if oldBacks.count <= indexpath.row {
            oldBacks.append("\(obj.back)")
        }else {
            oldBacks[indexPath.row] = "\(obj.back)"
        }
        return cell
    }