ios - 将UIView附加到UITextView

Question

我想将自定义视图元素附加到UITextView。它需要很好地处理周围的文本，并允许它被选中和删除。这与Apple Notes中的inline image函数非常相似。
在Swift中实现这一点的代码是什么，我猜是NSTextAttachement？
例子：

Answer 1

您的猜测是正确的，您可以使用NSTextAttachement将视图附加为图像，这是一个简单的逐步过程
渲染图像

let renderer = UIGraphicsImageRenderer(size: view.frame.size)
let image = renderer.image {
    view.layer.render(in: $0.cgContext)
}

创建附件

let attachment = NSTextAttachment()
attachment.image = image
attachment.bounds = CGRect(origin: .zero, size: image.size)

最后，插入附件

let currentAtStr = NSMutableAttributedString(attributedString: textView.attributedText)
let attachmentAtStr = NSAttributedString(attachment: attachment)
if let selectedRange = textView.selectedTextRange {
    let cursorIndex = textView.offset(from: textView.beginningOfDocument, to: selectedRange.start)
    currentAtStr.insert(attachmentAtStr, at: cursorIndex)

     // Workaround that causes different font after the attachment image, https://stackoverflow.com/questions/21742376
    currentAtStr.addAttributes(textView.typingAttributes, range: NSRange(location: cursorIndex, length: 1))
} else {
    currentAtStr.append(attachmentAtStr)
}
textView.attributedText = currentAtStr