UIDatePicker，显示带有年份和时间的完整日期

Question

能否在 DatePicker 上 UIDatePicker 显示日、月、年和时间，或者我是否需要自定义 UIPickerView？即

2000 年 11 月 12 日星期一上午 5 点 20 分

当前 .datePickerMode 设置为 .dateTime 的日期选择器显示

11 月 12 日星期一 5 上午 20 点

Answer 1

是的，你可以。但是您需要将两者结合起来。使用年份的选择器视图并将日期选择器的最小值设置为所选年份的第一天，将最大值设置为该年的最后一天。您还需要将 UIDatePicker 属性 [datePickerMode][1] 设置为 .dateAndTime

import UIKit

class ViewController: UIViewController, UIPickerViewDelegate, UIPickerViewDataSource {
    @IBOutlet weak var pickerView: UIPickerView!
    @IBOutlet weak var datePicker: UIDatePicker!
    let years = Array(Date().year-3...Date().year+3)
    var date = Date()
    var lastIndex = 3
    override func viewDidLoad() {
        super.viewDidLoad()
        pickerView.delegate = self
        pickerView.dataSource = self
        datePicker.date = Date()
    }
    @IBAction func dateChanged(_ datePicker: UIDatePicker) {
        date = datePicker.date
        print(datePicker.date.year)
        print(datePicker.date)
    }
    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        pickerView.selectRow(3, inComponent: 0, animated: true)
        setDatePickerMinimumAndMaximumDatesFor(year: years[3])
    }
    func pickerView(_ pickerView: UIPickerView,
                    numberOfRowsInComponent component: Int) -> Int {
        return years.count
    }
    func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
        return String(years[row])
    }
    func numberOfComponents(in pickerView: UIPickerView) -> Int {
        return 1
    }
    func setDatePickerMinimumAndMaximumDatesFor(year: Int) {
        datePicker.minimumDate = year.firstDayOfTheYear
        datePicker.maximumDate = year.lastDayOfTheYear
    }

    func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
setDatePickerMinimumAndMaximumDatesFor(year: years[row])
        if let optionalDate = Calendar.current.date(byAdding: .year, value: (lastIndex > row ? row - lastIndex :  -(lastIndex - row)), to: date) {
            datePicker.date = optionalDate
        }
        print(datePicker.date.year)
        print(datePicker.date)
    }
}
extension Date {
    var year: Int {
        return Calendar.current.component(.year, from: self)
    }
}
extension Int {
    var firstDayOfTheYear: Date {
        return DateComponents(calendar: .current, year: self, month: 1, day: 1).date!
    }
    var lastDayOfTheYear: Date {
        return DateComponents(calendar: .current, year: self, month: 12, day: 31).date!
    }
}

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