extension AICreatDetailViewController:UITextViewDelegate {
func textViewDidChange(_ textView: UITextView ) {
self.topPlaceholdLabel.isHidden = textView.text.count != 0
if let selectedRange = textView.markedTextRange {
let newtext = textView.text(in: selectedRange)
if newtext?.count ?? 0 > 0 {
return
}
} //用来解决不能输入中文
let loc = textView.selectedRange.location //用来定位光标
let len = textView.selectedRange.length //用来定位光标
//获取文本内容
let str = textView.text!
if str.count > 500 {
textView.text = (str as NSString).substring(to: 500)
}
textView.attributedText = attrWithString(content: textView.text)
textView.selectedRange = NSMakeRange(loc, len) //用来定位光标
textView.scrollRangeToVisible(textView.selectedRange)
}
func attrWithString(content:String) -> NSMutableAttributedString {
let attributes = NSMutableAttributedString(string: content)
attributes.addAttribute(.font, value: UIFont.systemFont(ofSize: 14, weight: .medium), range: NSRange(location: 0, length: content.count))
let paragraphStyle = NSMutableParagraphStyle()
paragraphStyle.lineSpacing = 5 // 段落高度
paragraphStyle.alignment = .left
paragraphStyle.lineBreakMode = .byCharWrapping
attributes.addAttribute(.paragraphStyle, value: paragraphStyle, range: NSRange(location: 0, length: content.count))
attributes.addAttribute(.foregroundColor, value: UIColor.white, range: NSRange(location: 0, length: content.count))
return attributes
}
}
