Swift：For-in 循环需要“[DeepSpeechTokenMetadata]”以符合“Sequence”

Question

我遇到了一个带有 for in 循环和数组的奇怪错误。 它说

For-in loop requires '[DeepSpeechTokenMetadata]' to conform to 'Sequence'

这没有任何意义......它知道它是一个数组......

有问题的for循环：

      var transcriptCandidate = decoded.transcripts[0].tokens
      var words = [String]()
      var timestamps = [Int]()

      var workingString = ""
      var lastTimestamp = -1
      for (x, token) in transcriptCandidate {
        let text = token.text
        let timestamp = token.startTime
        if(lastTimestamp == -1){
          lastTimestamp = timestamp.toInt()
        }

这是包含我尝试迭代的数组的类的定义：

public struct DeepSpeechCandidateTranscript {
    /// Array of DeepSpeechTokenMetadata objects
    public private(set) var tokens: [DeepSpeechTokenMetadata] = []

    /** Approximated confidence value for this transcript. This corresponds to
        both acoustic model and language model scores that contributed to the
        creation of this transcript.
    */
    let confidence: Double

    internal init(fromInternal: CandidateTranscript) {
        let tokensBuffer = UnsafeBufferPointer<TokenMetadata>(start: fromInternal.tokens, count: Int(fromInternal.num_tokens))
        for tok in tokensBuffer {
            tokens.append(DeepSpeechTokenMetadata(fromInternal: tok))
        }
        confidence = fromInternal.confidence
    }
}

谢谢！

Answer 1

您可以这样做，其中x是索引， token是元素：

for (x, token) in transcriptCandidate.enumerated() {
}

或者，如果您不需要索引：

for token in transcriptCandidate {
}