Question

这里有一个UICollectionView的大问题：线程1：EXC_BREAKPOINT（代码= 1，子代码= 0x100434d10）

我希望让AVSpeechSynthesizer迭代UICollectionViewCells，以便说出并突出显示我在自定义UIcollectionViewCells中的标签内容，这些内容效果相当好。如果我加载viewController并按下按钮来读取所有单元格，它可以正常工作。现在如果我滚动一点（向下一个或两个单元格）并按下相同的按钮，应用程序崩溃。

我不知道造成这种情况的原因。有人可以帮我解决这个问题吗？这是我的代码：

    @IBAction func playPauseButton(_ sender: UIButton) {

    if !self.speechSynthesizer.isSpeaking{
        let btnImage = UIImage(named: "pausedButton.png")
        self.playPauseButton.setImage(btnImage , for: UIControlState.normal)

        self.isPaused = false
        self.shouldStopReading = false //triggered only if stop is pressed

        var count = 0
        var indexPath = NSIndexPath(row: 0, section: 0)

        self.collectionView.selectItem(at: indexPath as IndexPath, animated: true, scrollPosition: .top)

        isAutoPlaying = true
        currentSelectedRow = 0
        scrollAndSpeak(at: currentSelectedRow!)
    }
 }


   func scrollAndSpeak(at index: Int) {
    if index < self.wordList.count{
        if self.shouldStopReading == false{

           let indexPath = IndexPath(row: index, section: 0)

            self.collectionView.selectItem(at: indexPath, animated: true, scrollPosition: .top)
            let cell = self.collectionView.cellForItem(at: indexPath) as! CollectionViewCell
            self.speakString(sender: self, str: (cell.label.text!)) //Speech
        }
    }
}

func speakString(sender: AnyObject,str:String) {

    let utterance = AVSpeechUtterance(string: str)
    utterance.rate = self.speechRate
    utterance.voice = AVSpeechSynthesisVoice.init(language: "en_US")
    speechSynthesizer.speak(utterance)
}

func speechSynthesizer(_ synthesizer: AVSpeechSynthesizer, willSpeakRangeOfSpeechString characterRange:
            NSRange, utterance: AVSpeechUtterance) {

            let font = UIFont.systemFont(ofSize: 25)

             let cell = self.collectionView.dequeueReusableCell(withReuseIdentifier: "CollectionViewCell", for:indexPath as IndexPath ) as! CollectionViewCell

             let mutableAttributedString = NSMutableAttributedString (string : cell.label.text!)
            mutableAttributedString.addAttribute(NSBackgroundColorAttributeName, value: UIColor.blue, range:characterRange)
             mutableAttributedString.addAttribute(NSFontAttributeName, value: font, range: characterRange)
             cell.label.attributedText = mutableAttributedString;
        }

   func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
    let myCell = collectionView.dequeueReusableCell(withReuseIdentifier: "CollCell", for: indexPath) as! CollectionViewCell
    myCell.label.text = self.wordList[indexPath.row]
    //collectionView.cel
    return myCell
}

滚动CollectionView时，UICollectionView AVSpeechSynthesizer崩溃

0 个答案: