在Swift中设置日期选择器和文本字段时激活的按钮

import UIKit

class ViewController: UIViewController {
    @IBOutlet weak var textField: UITextField!
    let datePicker = UIDatePicker()

    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 设置日期选择器的样式
        datePicker.datePickerMode = .date
        datePicker.addTarget(self, action: #selector(datePickerValueChanged), for: .valueChanged)
        
        // 将日期选择器设置为文本字段的输入视图
        textField.inputView = datePicker
        
        // 创建一个按钮并与文本字段关联
        let button = UIButton(type: .system)
        button.setTitle("选择日期", for: .normal)
        button.addTarget(self, action: #selector(buttonTapped), for: .touchUpInside)
        textField.rightView = button
        textField.rightViewMode = .always
    }
    
    @objc func datePickerValueChanged() {
        let dateFormatter = DateFormatter()
        dateFormatter.dateFormat = "yyyy-MM-dd"
        textField.text = dateFormatter.string(from: datePicker.date)
    }
    
    @objc func buttonTapped() {
        textField.becomeFirstResponder()
    }
}