文章目录
- 截图
- 代码:具体使用
- 代码:CustomTextView
截图
代码:具体使用
scrollView.addSubview(contentTextView)contentTextView.placeholderLabel.text = LocalizableManager.localValue("write_comment")contentTextView.maxCharacters = 500contentTextView.backgroundColor = newUIBackColorcontentTextView.snp.makeConstraints { make inmake.left.right.equalToSuperview().inset(20)make.top.equalTo(problemLabel.snp_bottomMargin).offset(20)make.height.equalTo(150)}contentTextView.characterCountChanged = { [self] count inprint("当前输入了 \(count) 个字符")textCountLabel.text = String(count) + "/500"}
代码:CustomTextView
class CustomTextView: UITextView {var placeholderLabel: UILabel!var maxCharacters = 200var characterCountChanged: ((Int) -> Void)?override init(frame: CGRect, textContainer: NSTextContainer?) {super.init(frame: frame, textContainer: textContainer)setup()}required init?(coder: NSCoder) {super.init(coder: coder)setup()}private func setup() {delegate = selfself.font = UIFont.systemFont(ofSize: 15)placeholderLabel = UILabel()placeholderLabel.text = LocalizableManager.localValue("report_description_tips")placeholderLabel.font = self.fontplaceholderLabel.textColor = UIColor.lightGrayplaceholderLabel.numberOfLines = 0placeholderLabel.isHidden = !self.text.isEmptyaddSubview(placeholderLabel)updatePlaceholderFrame()}override func layoutSubviews() {super.layoutSubviews()updatePlaceholderFrame() }private func updatePlaceholderFrame() {let placeholderSize = placeholderLabel.sizeThatFits(CGSize(width: self.frame.width - 10, height: CGFloat.greatestFiniteMagnitude))placeholderLabel.frame = CGRect(x: 5, y: 5, width: placeholderSize.width, height: placeholderSize.height)}
}extension CustomTextView: UITextViewDelegate {func textViewDidChange(_ textView: UITextView) {placeholderLabel.isHidden = !textView.text.isEmptyif textView.text.count > maxCharacters {textView.text = String(textView.text.prefix(maxCharacters))}characterCountChanged?(textView.text.count)}
}