UITextField 和 UIDatePicker 可重用代码

Question

您好，您在 reddit 上找到了这段代码，它将文本字段的键盘更改为 UIDatepicker，因此我们可以 select 约会。该代码效果很好。但是，我正在尝试重构它以使其可重复使用，因为我在同一个 VC 上有 3 个文本字段，它们都需要能够 select 日期。这是代码

class ViewController: UIViewController {

    @IBOutlet weak var txtDatePicker: UITextField!
    let datePicker = UIDatePicker()

    override func viewDidLoad() {
        super.viewDidLoad()
        showDatePicker()
    }


    func showDatePicker(){
        //Formate Date
        datePicker.datePickerMode = .date

        //ToolBar
        let toolbar = UIToolbar();
        toolbar.sizeToFit()
        let doneButton = UIBarButtonItem(title: "Done", style: .plain, target: self, action: #selector(donedatePicker));
        let spaceButton = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.flexibleSpace, target: nil, action: nil)
        let cancelButton = UIBarButtonItem(title: "Cancel", style: .plain, target: self, action: #selector(cancelDatePicker));

        toolbar.setItems([doneButton,spaceButton,cancelButton], animated: false)

        txtDatePicker.inputAccessoryView = toolbar
        txtDatePicker.inputView = datePicker

    }

    @objc func donedatePicker(){

        let formatter = DateFormatter()
        formatter.dateFormat = "dd/MM/yyyy"
        txtDatePicker.text = formatter.string(from: datePicker.date)
        self.view.endEditing(true)
    }

    @objc func cancelDatePicker(){
        self.view.endEditing(true)
    }
}

这是我尝试过的方法，但我在通过 #selector

传递参数时遇到问题

class ViewController: UIViewController {

    @IBOutlet weak var txtDatePicker: UITextField!
    let datePicker = UIDatePicker()

    override func viewDidLoad() {
        super.viewDidLoad()
        showDatePicker(textField: txtDatePicker)
    }


    func showDatePicker(textField: UITextField){
        //Formate Date
        datePicker.datePickerMode = .date

        //ToolBar
        let toolbar = UIToolbar();
        toolbar.sizeToFit()
        let doneButton = UIBarButtonItem(title: "Done", style: .plain, target: self, action: #selector(donedatePicker(textField:)));
        let spaceButton = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.flexibleSpace, target: nil, action: nil)
        let cancelButton = UIBarButtonItem(title: "Cancel", style: .plain, target: self, action: #selector(cancelDatePicker));

        toolbar.setItems([doneButton,spaceButton,cancelButton], animated: false)

        textField.inputAccessoryView = toolbar
        textField.inputView = datePicker

    }

    @objc func donedatePicker(textField: UITextField){

        let formatter = DateFormatter()
        formatter.dateFormat = "dd/MM/yyyy"
        textField.text = formatter.string(from: datePicker.date)
        self.view.endEditing(true)
    }

    @objc func cancelDatePicker(){
        self.view.endEditing(true)
    }
}

Answer 1

对于这种情况，我建议您使用 自定义 UITextField。

class CustomTextField: UITextField {

    lazy var datePicker: UIDatePicker = {
        let datePicker = UIDatePicker()
        datePicker.datePickerMode = .date
        return datePicker
    }()

    lazy var toolBar: UIToolbar = {
        let toolbar = UIToolbar()
        let doneButton = UIBarButtonItem(title: "Done", style: .plain, target: self, action: #selector(donedatePicker))
        let spaceButton = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.flexibleSpace, target: nil, action: nil)
        let cancelButton = UIBarButtonItem(title: "Cancel", style: .plain, target: self, action: #selector(cancelDatePicker))

        toolbar.setItems([doneButton,spaceButton,cancelButton], animated: false)
        toolbar.sizeToFit()
        return toolbar
    }()

    override init(frame: CGRect) {
        super.init(frame: frame)

        addDatePicker()
    }

    func addDatePicker() {
        inputAccessoryView = toolBar
        inputView = datePicker
    }

    @objc func donedatePicker(){
        let formatter = DateFormatter()
        formatter.dateFormat = "dd/MM/yyyy"
        text = formatter.string(from: datePicker.date)
        endEditing(true)
    }

    @objc func cancelDatePicker() {
        endEditing(true)
    }

    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

}

注意：我没有检查过你的代码。我刚刚以最佳方式重构了自定义 class.

UITextField 和 UIDatePicker 可重用代码

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