UIDatePicker：选择当前日期（快速）

Question

我有一个UIDatePicker，其中某些日期是通过首字母设置的。借助addTarget，我听了valueChanged事件，当车轮旋转时，一切正常。

我希望允许用户直接选择初始日期（例如，通过单击它）。但是现在只有车轮旋转时才发生此事件。要输入当前日期，用户将必须：

1. 输入新日期
2. 转到上一个日期

我的代码：

class Picker {
    init() {
        let datePicker = UIDatePicker()
        datePicker.setDate(Date(), animated: false) // Set initial date
        datePicker.addTarget(self, action: #selector(handleDatePicker(sender:)), for: .valueChanged)
    }

    @objc func handleDatePicker(sender: UIDatePicker) {
        print(sender.date)
    }
}

Picker()

截屏：

解决方案：

最正确的解决方法是使用UIToolBar按钮添加Done。可以在这里找到代码：example with UIToolBar

Answer 1

在datePicker中的“单击完成”按钮上选择第一个索引值

func pickUp（_ textField：UITextField）{

    // UIPickerView
    self.myPickerView = UIPickerView(frame:CGRect(x: 0, y: 0, width: self.view.frame.size.width, height: 216))
    self.myPickerView.delegate = self
    self.myPickerView.dataSource = self
    self.myPickerView.backgroundColor = UIColor.white
    textField.inputView = self.myPickerView

    // ToolBar
    let toolBar = UIToolbar()
    toolBar.barStyle = .default
    toolBar.isTranslucent = true
    toolBar.tintColor = UIColor.darkGray
    toolBar.sizeToFit()

    // Adding Button ToolBar
    let doneButton = UIBarButtonItem(title: "Done", style: .plain, target: self, action: #selector(UrVC.doneClick))
    let spaceButton = UIBarButtonItem(barButtonSystemItem: .flexibleSpace, target: nil, action: nil)
    let cancelButton = UIBarButtonItem(title: "Cancel", style: .plain, target: self, action: #selector(UrVC.cancelClick))
    toolBar.setItems([cancelButton, spaceButton, doneButton], animated: false)
    toolBar.isUserInteractionEnabled = true
    textField.inputAccessoryView = toolBar

}

@objc func doneClick（）{

    pickerTxtfld.resignFirstResponder()
    let indexPath = myPickerView.selectedRow(inComponent: 0)
    pickerTxtfld.text = dataArray[indexPath]


}
@objc func cancelClick() {
    pickerTxtfld.resignFirstResponder()
}