UIActivityViewController分享带多空格文本时空格丢失，如何保留？

当使用UIActivityViewController分享带连续多空格的文本（比如Estimate: $400）时，收件方收到的内容会自动把多余空格合并成单个，变成Estimate: $400。下面提供几种可行的解决方法：

方法1：替换普通空格为非换行Unicode空格 #

把文本里的普通空格替换成非换行空格（Unicode编码\u{00A0}），这种空格不会被邮件或文本工具自动合并。修改代码如下：

@IBAction func shareTextButton(_ sender: UIButton) {
    // 原始带多空格的文本
    let originalText = "Estimate:       $400"
    // 替换普通空格为非换行空格
    let text = originalText.replacingOccurrences(of: " ", with: "\u{00A0}")
    
    let textToShare = [text]
    let activityViewController = UIActivityViewController(activityItems: textToShare, applicationActivities: nil)
    self.present(activityViewController, animated: true, completion: nil)
}

方法2：分享富文本（NSAttributedString） #

如果需要更灵活的格式控制，直接分享富文本对象，系统会保留排版细节，包括多空格：

@IBAction func shareTextButton(_ sender: UIButton) {
    let attributedText = NSMutableAttributedString(string: "Estimate:       $400")
    // 可根据需求设置字体、颜色等属性
    attributedText.addAttribute(.font, value: UIFont.systemFont(ofSize: 16), range: NSRange(location: 0, length: attributedText.length))
    
    let textToShare = [attributedText]
    let activityViewController = UIActivityViewController(activityItems: textToShare, applicationActivities: nil)
    self.present(activityViewController, animated: true, completion: nil)
}

方法3：用HTML格式分享 #

把文本转换成HTML格式，用 表示需要保留的空格，邮件客户端能正确解析这种格式：

@IBAction func shareTextButton(_ sender: UIButton) {
    let originalText = "Estimate:       $400"
    // 替换空格为HTML非换行空格标签
    let htmlText = originalText.replacingOccurrences(of: " ", with: " ")
    let htmlString = "<html><body>\(htmlText)</body></html>"
    
    let textToShare = [htmlString]
    let activityViewController = UIActivityViewController(activityItems: textToShare, applicationActivities: nil)
    self.present(activityViewController, animated: true, completion: nil)
}

内容的提问来源于stack exchange，提问作者nitin67