iOS:是否在UITextView的光标处插入属性字符串?

https://developer.apple.com/documentation/foundation/nsmutableattributedstring/1414947-insert .

根据@matt的建议,这里有一个Swift 4.x函数:

fileprivate func insertAtTextViewCursor(attributedString: NSAttributedString) {
    // Exit if no selected text range
    guard let selectedRange = textView.selectedTextRange else {
        return
    }

    // If here, insert <attributedString> at cursor
    let cursorIndex = textView.offset(from: textView.beginningOfDocument, to: selectedRange.start)
    let mutableAttributedText = NSMutableAttributedString(attributedString: textView.attributedText)
    mutableAttributedText.insert(attributedString, at: cursorIndex)
    textView.attributedText = mutableAttributedText
}