当玩家收到轮到他们的通知时迅速崩溃

问题描述

Fatal error: Unexpectedly found nil while implicitly unwrapping an Optional value: file HATurnBasedMatchHelper.swift,line 244
2021-01-25 20:36:22.317564-0500 QuizApp[14288:4507393] Fatal error: Unexpectedly found nil while implicitly unwrapping an Optional value: file HATurnBasedMatchHelper.swift,line 244


func player(_ player: GKPlayer,receivedTurnEventFor match: GKTurnBasedMatch,didBecomeActive: Bool) {
    // Crash on Line 244
    // state of self when using notification
    /*
     self    QuizApp.HATurnBasedMatchHelper    0x0000000281a4c310
         ObjectiveC.NSObject    NSObject
         reachability    QuizApp.Reachability?    0x0000000281a4c7e0
         savetoLoseList    Bool?    false    some
         isMultiplayerGame    Bool?    false    some
         currentMatch    GKTurnBasedMatch?    0x0000000283e29530
         selectedCategory    QuizApp.HACategory?    nil    none
         delegate    QuizApp.HATurnbasedMatchHelperDelegate?    nil    none
         presentingViewController    UIViewController?    nil    none
         myWins    Int64    1
         pendingWins    Int64    0
         takeAnotherChallenge    Bool?    false    some
     */
    /* I added the if condition to check if the VC is nil */
    if self.presentingViewController != nil {
        self.presentingViewController.dismiss(animated: true,completion: nil)
    }
    self.currentMatch = match
    
    let firstParticipant = match.participants[0]
    
    if firstParticipant.lastTurnDate == nil
    {
        delegate.enterNewGame(match: match)
    }
    else{
        var statusstring : String? = nil
        var thisParticipant : GKTurnBasedParticipant? = nil
        var otherParticipant : GKTurnBasedParticipant? = nil
        
        for participant in match.participants
        {
            if participant.player?.playerID == GKLocalPlayer.local.playerID
            {
                thisParticipant = participant
            }
            else{
                otherParticipant = participant
            }
        }
        if thisParticipant?.matchOutcome == .quit {

            statusstring = "You have Quit this match"
        }
        else if otherParticipant?.matchOutcome == .quit
        {
            statusstring = "Opponent has Quit this match"
        }
        else if otherParticipant?.status ==  .declined
        {
            statusstring = "Opponent has Declined your challenge"
        }

        if statusstring == nil{
            if match.currentParticipant?.player?.playerID == GKLocalPlayer.local.playerID
            {
                // crash here
                // delegat is nil. I posted all values of self above
                delegate.takeTurn(match: match)
            }
            else{
                delegate.layout(match: match)
            }
        }
        else{
            let alertController = UIAlertController(title: "Match status\n",message:statusstring,preferredStyle: .alert)
            let okAction = UIAlertAction(title: "Ok",style: .default) { (action) in
                
            }
            alertController.addAction(okAction)
            self.presentingViewController.present(alertController,animated: true,completion: nil)
        }
    }
}

我不确定我在这里做错了什么。

确切的错误是

Thread 1: Fatal error: Unexpectedly found nil while implicitly unwrapping an Optional value

解决方法

暂无找到可以解决该程序问题的有效方法，小编努力寻找整理中！

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