Question

我在常规ViewController中有两个UITextField，我在左侧用CALayer设置了一个绿色边框。

这是我开发的代码：

let borderU = CALayer()
    let borderP = CALayer()

    let posx = CGFloat(2.0)

    let height:CGFloat = (txtfUser?.frame.size.height)!
    if #available(iOS 11.0, *) {
        borderU.borderColor = UIColor(named: "primaryGreen")?.cgColor
        borderP.borderColor = UIColor(named: "primaryGreen")?.cgColor
    } else {
        // Fallback on earlier versions
    }
    borderU.frame = CGRect(x: posx, y: -2, width:  2, height: height)
    borderP.frame = CGRect(x: posx, y: -2, width:  2, height: height)

    borderU.borderWidth = CGFloat(2.0)
    borderP.borderWidth = CGFloat(2.0)

    self.txtfUser?.layer.addSublayer(borderU)
    self.txtfUser?.layer.masksToBounds = true

    self.txtfPassWord?.layer.addSublayer(borderP)
    self.txtfPassWord?.layer.masksToBounds = true

在下一个View控制器中，我有九个UITextField，我需要在左侧使用相同的边框，我想到了解决方案，不要重复九次代码，但没有工作：

        let border = CALayer()

    let posx = CGFloat(2.0)

    let height:CGFloat = (txtfUser?.frame.size.height)!
    if #available(iOS 11.0, *) {
        border.borderColor = UIColor(named: "primaryGreen")?.cgColor
    } else {
        // Fallback on earlier versions
    }
    border.frame = CGRect(x: posx, y: -2, width:  2, height: height)

    border.borderWidth = CGFloat(2.0)

    self.txtfUser?.layer.addSublayer(border)
    self.txtfUser?.layer.masksToBounds = true

    self.txtfPassWord?.layer.addSublayer(border)
    self.txtfPassWord?.layer.masksToBounds = true

任何帮助将不胜感激。

Answer 1

您可以继承textField：

class TextField: UITextField {
    private var leftLayer: CALayer!
    override func awakeFromNib() {
        super.awakeFromNib()
        //create your layer here, and keep reference in leftLayer for further resize, color...
    }
}

CALayer作为左边界不起作用？

1 个答案: