swift - UIDatePicker:选择当前日期(快速)

Question

我有一个UIDatePicker，其中一些日期是由初始值设置的。通过 addTarget，我监听了 valueChanged 事件，并且当轮子旋转时一切正常。

我希望允许用户直接选择初始日期(例如，通过单击它)。但现在，只有当车轮转动时，事件才会发生。要输入当前日期，用户必须:

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()

屏幕截图:

解决方案:

最正确的解决方案是在 UIToolBar 中添加 Done 按钮。代码可以在这里找到:example with UIToolBar

Answer 1

点击 datePicker 中的完成按钮选择第一个索引值

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()
  }