Swift 创建自定义UITextfield

如何创建自定义UITextfield？我创建了一个类，其中uitextfield是一个子类，然后我添加了一个标签，它会显示出来，但是这里没有显示边框（UIView），这是代码

import UIKit

class borderedTextField: UITextField{
    let viewz:UIView! = UIView()
    var border:UIView! = UIView()
    var name:UILabel! = UILabel()

    override func draw(_ rect: CGRect) {
        self.addSubview(viewz)
    }

    override func layoutSubviews() {
        backgroundColor = UIColor.green
    }

    func placement(){
        border.frame.size.height = 15
    border.backgroundColor = UIColor.black
    border.translatesAutoresizingMaskIntoConstraints = false
    viewz.addSubview(border)
    border.heightAnchor.constraint(equalToConstant: 15).isActive = true
    border.widthAnchor.constraint(equalToConstant: 100)
    border.leftAnchor.constraint(equalTo: viewz.leftAnchor, constant: 10).isActive = true
    border.bottomAnchor.constraint(equalTo: viewz.bottomAnchor, constant: -5).isActive = true

    name.text = "whatt"
    name.textAlignment = .left
    name.textColor = UIColor.black
    name.translatesAutoresizingMaskIntoConstraints = false
    viewz.addSubview(name)
    name.widthAnchor.constraint(equalToConstant: 100)
    name.heightAnchor.constraint(equalToConstant: 50)
    name.leftAnchor.constraint(equalTo: viewz.leftAnchor, constant: 5).isActive = true
    name.topAnchor.constraint(equalTo: viewz.topAnchor, constant: 10).isActive = true

    }

}

我以编程的方式调用它（没有故事板），请让我知道如何在不使用故事板的情况下解决这个问题，我需要它是完整的代码

import UIKit

class signViewController: UIViewController,UITextFieldDelegate {
var animText:borderedTextField!

 override func viewDidLoad() {
        super.viewDidLoad()
       let animText = borderedTextField()
        animText.delegate = self
        animText.placeholder = "click here"
        animText.placement()
        animText.frame = CGRect(x: 100, y: 500, width: 200, height: 90)
        view.addSubview(animText)
 }
}

---

您必须添加

init

override init (frame : CGRect) {
    super.init(frame : frame)
    self.placement()
}

required init?(coder aDecoder: NSCoder) {
    super.init(coder: aDecoder)
    self.placement()
}

此外，边框的宽度未处于活动状态

border.widthAnchor.constraint(equalToConstant: 100).active = true

名副其实

name.widthAnchor.constraint(equalToConstant: 100).active = true
name.heightAnchor.constraint(equalToConstant: 50).active = true

编辑

---

变量边框：UIView！=UIView（）它显示在文本字段的左上角，而不是底部。因为您将其约束为viewz。bottomAnchor更改为self.bottomAnchor，viewz也没有约束。我收到此错误“因为他们没有共同的祖先。约束或其锚定是否引用不同视图层次中的项？必须将self.addSubview（viewz）行放在placement函数中才能对其进行约束

border.leftAnchor.constraint(equalTo: self.leftAnchor, constant: 10).isActive = true
border.bottomAnchor.constraint(equalTo: self.bottomAnchor, constant: -5).isActive = true