ios - 将底线边框添加到 TextView - iOS

Question

将底线边框添加到 TextView 的最佳方法是什么？我已经试过了，但它似乎不起作用。它受 textview 滚动能力的影响，并且在 TextView

中间绘制线条

func addBottomBorderWithColor(color: UIColor, width: CGFloat) {
        let border = CALayer()
        border.backgroundColor = color.CGColor
        border.frame = CGRectMake(0, self.frame.size.height - width, self.frame.size.width, width)
        self.layer.addSublayer(border)
        self.layer.masksToBounds = true
 }

编辑:TextView 具有动态高度。

Answer 1

Swift 4 版本

func addBottomBorderWithColor() {
    let border = CALayer()
    border.backgroundColor = UIColor.black.cgColor
    border.frame = CGRect(x: 0, y: yourTextArea.frame.height - 1, width: yourTextArea.frame.width, height: 1)
    yourTextArea.layer.addSublayer(border)
    self.view.layer.masksToBounds = true
}