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UITEXTVIEW-每行字符的限制数量

发布于 2025-01-26 12:41:39 字数 168 浏览 1 评论 0原文

我有一个uitextView，每次用户每行限制chars限制时，我都想划分（假设每行30个字符是最大的字符）。而且我也想保存单词包装，因此，如果单词中间达到了30个限制，则应该直接进入新行。

我应该如何解决这个问题？我希望有一个本机解决方案，但在文档中找不到任何相关的解决方案。

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酷炫老祖宗 2025-02-02 12:41:39

您可以使用textViewDidchange从uitextviewDelegate使用textViewDidChange委托方法来添加newline，每30个字符之后，

func textViewDidChange(_ textView: UITextView) {
    if let text = textView.text {
        let strings = string.components(withMaxLength: 30) // generating an array of strings with equally split parts
        var newString = ""
        for string in strings {
            newString += "\(string)\n" //joining all the strings back with newline
        }
       textView.text = String(newString.dropLast(2)) //dropping the new line sequence at the end
    }
}

您将需要此扩展名来split string> string 在上述代码中相等的部分工作：

extension String {
    func components(withMaxLength length: Int) -> [String] {
        return stride(from: 0, to: self.count, by: length).map {
            let start = self.index(self.startIndex, offsetBy: $0)
            let end = self.index(start, offsetBy: length, limitedBy: self.endIndex) ?? self.endIndex
            return String(self[start..<end])
        }
    }
}

You can use this workaround by using textViewDidChange delegate method from UITextViewDelegate to add newline after every 30 characters, like this

func textViewDidChange(_ textView: UITextView) {
    if let text = textView.text {
        let strings = string.components(withMaxLength: 30) // generating an array of strings with equally split parts
        var newString = ""
        for string in strings {
            newString += "\(string)\n" //joining all the strings back with newline
        }
       textView.text = String(newString.dropLast(2)) //dropping the new line sequence at the end
    }
}

You will need this extension to split String in equal parts for above code to work though:

extension String {
    func components(withMaxLength length: Int) -> [String] {
        return stride(from: 0, to: self.count, by: length).map {
            let start = self.index(self.startIndex, offsetBy: $0)
            let end = self.index(start, offsetBy: length, limitedBy: self.endIndex) ?? self.endIndex
            return String(self[start..<end])
        }
    }
}

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