我正在努力设置datepicker只允许时间和Swift的24小时格式,任何想法如何做到这一点?
谢谢
OP说他正试图在Swift中重建this answer。答案是一个kludge(它取决于使用24小时格式的丹麦语语言环境,而不是实际解决问题),但这里是你如何在Swift中做到这一点:
var datePicker = UIDatePicker() // Although you probably have an IBOutlet
datePicker.datePickerMode = UIDatePickerMode.Time
datePicker.locale = NSLocale(localeIdentifier: "da_DK")
但这是一个kludge - 滚动你自己的UIPicker
!
更新OP表示滚动你自己是“麻烦” - 它实际上非常简单 - 这是一个简单的方法(虽然更好的方法是子类UIPickerView
)...
import UIKit
class ViewController: UIViewController, UIPickerViewDelegate, UIPickerViewDataSource {
@IBOutlet weak var myDatePicker: UIPickerView!
private var calendar = Calendar.autoupdatingCurrent
override func viewDidLoad() {
super.viewDidLoad()
self.time = Date() // updates the picker to "now"
}
// MARK: UIPickerViewDataSource
func numberOfComponents(in: UIPickerView) -> Int { return 2 }
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
if component == 0 { // Hours
return 24
}
return 12 // five minute intervals
}
// MARK: UIPickerViewDelegate
func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
if component == 0 { // Hours
return String(format: "%02d", row)
}
return String(format: "%02d", row * 5)
}
func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
print("picker changed, selected \(self.time)")
}
// MARK: Getting & setting the time
var time: Date {
get {
let unitFlags: Calendar.Unit = [.year, .day, .hour, .minute, .second]
var components = self.calendar.components(unitFlags, from: Date())
components.hour = self.myDatePicker.selectedRow(inComponent: 0)
components.minute = self.myDatePicker.selectedRow(inComponent: 1) * 5
components.second = 0
if let date = self.calendar.date(from: components) {
return date
}
return Date() // shouldn't get here
}
set {
var components = self.calendar.components([.hour, .minute], from: newValue)
if let hour = components.hour, let minute = components.minute {
self.myDatePicker.selectRow(hour, inComponent: 0, animated: true)
self.myDatePicker.selectRow(minute / 5, inComponent: 1, animated: true)
}
}
}
}
IOS Swift4
let datePickerView: UIDatePicker = UIDatePicker()
// For 12 hours Format
datePickerView.locale = Locale(identifier: "en_US")
// For 24 Hrs
datePickerView.locale = Locale(identifier: "en_GB")