Question

我正试图从UITextView中获取正在输入的单词。我在textViewDidChange(_:)中放置了以下代码，我在此处的另一个答案中找到了这些代码，但它对于表情符号不起作用：

func editedWord() -> String {
    let cursorPosition = selectedRange.location
    let separationCharacters = CharacterSet(charactersIn: " ")

    // Count how many actual characters there are before the cursor.
    // Emojis/special characters can each increase selectedRange.location
    // by 2 instead of 1

    var unitCount = 0
    var characters = 0
    while unitCount < cursorPosition {
        let char = text.index(text.startIndex, offsetBy: characters)
        let int = text.rangeOfComposedCharacterSequence(at: char) // Crashes here when there's an emoji.
        unitCount = text.distance(from: text.startIndex, to: int.upperBound)
        characters += 1
    }

    let beginRange = Range(uncheckedBounds: (lower: text.index(text.startIndex, offsetBy: 0), upper: text.index(text.startIndex, offsetBy: characters)))
    let endRange = Range(uncheckedBounds: (lower: text.index(text.startIndex, offsetBy: characters), upper: text.index(text.startIndex, offsetBy: text.characters.count)))


    let beginPhrase = text.substring(with: beginRange)
    let endPhrase = text.substring(with: endRange)

    let beginWords = beginPhrase.components(separatedBy: separationCharacters)
    let endWords = endPhrase.components(separatedBy: separationCharacters)

    return beginWords.last! + endWords.first!
}

我已经指出了它在while循环中崩溃的位置，并且崩溃说“索引X无效”。我该如何解决这个问题？

Answer 1

您应该从字符串中获取最后一个单词。以下是获取它的代码：

currentPage: params.page_number || 1

希望这有帮助！

获取已编辑的UITextView单词

1 个答案: