UITextView

 1
 2let textView = UITextView()
 3
 4// 设置输入文字的样式属性
 5textView.typingAttributes = [
 6    .font: UIFont.systemFont(ofSize: 16),
 7    .foregroundColor: UIColor.black
 8]
 9
10// 设置链接文字的样式属性
11textView.linkTextAttributes = [
12   .foregroundColor: UIColor.blue,
13   .underlineStyle: NSUnderlineStyle.single
14]
15
16// 设置键盘上的附加视图
17textView.inputAccessoryView = UIToolbar(frame: CGRect(x: 0, y: 0, width: SCREEN_WIDTH, height: 44))

1
2public func updateCursorPosition(range: NSRange) {
3    self.selectedRange = range
4}
5    

 1public func insertAttrStringAtCursor(AttrString string: NSAttributedString) {
 2    // self: UITextView 自身
 3    // 插入属性文本到光标位置
 4    self.textStorage.insert(string, at: self.selectedRange.location)
 5    // 计算光标位置
 6    let cursorRange = NSRange(location: self.selectedRange.location + string.length, length: 0)
 7    // 更新光标位置 
 8    updateCursorPosition(range: cursorRange)
 9    // 调用自身的代理
10    self.delegate?.textViewDidChange?(self)
11}

 1public func replace(AttrString string: NSAttributedString, ForRange range: NSRange) {
 2    // 替换属性文本到指定位置
 3    self.textStorage.replaceCharacters(in: range, with: string)
 4    // 计算光标位置
 5    let cursorRange = NSRange(location: range.location + string.length, length: 0)
 6    // 更新光标位置
 7    updateCursorPosition(range: cursorRange)
 8    // 调用自身的代理
 9    self.delegate?.textViewDidChange?(self)
10}

 1
 2public func deleteAttrString(ForRange range: NSRange) {
 3    // 删除指定位置的属性文本
 4    self.textStorage.deleteCharacters(in: range)
 5    // 计算光标位置
 6    let cursorRange = NSRange(location: range.location, length: 0)
 7    // 更新光标位置
 8    updateCursorPosition(range: cursorRange)
 9    // 调用自身的代理
10    self.delegate?.textViewDidChange?(self)
11}