如何以编程方式修复UITextfield锚点？

Question

总有办法以编程方式设置UITextfield的锚的约束吗？

Answer 1

这就是我的工作方式：

import UIKit

class ViewController: UIViewController,UITextFieldDelegate {
    lazy var passwordText: UITextField = {
        let textField = UITextField()
        let attributedText = NSMutableAttributedString(string: "Password", attributes: [NSAttributedString.Key.font: UIFont.boldSystemFont(ofSize: 20),NSAttributedString.Key.foregroundColor: UIColor.gray])
        textField.backgroundColor = UIColor.clear
        textField.attributedText = attributedText
        textField.translatesAutoresizingMaskIntoConstraints = false
        textField.resignFirstResponder()
        textField.borderStyle = UITextField.BorderStyle.roundedRect
        return textField
    }()

    func textFieldShouldReturn(_ textField: UITextField) -> Bool {
        self.view.endEditing(true)
        return false
    }
    override func viewDidLoad() {
        super.viewDidLoad()
        passwordText.delegate = self
        view.addSubview(passwordText)
        passwordText.translatesAutoresizingMaskIntoConstraints = false
        passwordText.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor,constant:200).isActive = true
        passwordText.widthAnchor.constraint(equalTo: view.safeAreaLayoutGuide.widthAnchor,multiplier:0.5).isActive = true
        passwordText.leadingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.leadingAnchor,constant:30).isActive = true

    }
}