问题
How we can set UIDatePicker values to show only Sunday's date in swift iOS ?
回答1:
finally, I myself found solution. In didSelectRow Method check if the selected day is sunday??? if yes then ok but if not then reload component to select date of nearest sunday.
func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
if component == 0 {
pickerView.reloadComponent(1)
}
let titleLabel = pickerView.viewForRow(row, forComponent: component) as? UILabel
titleLabel?.font = UIFont(name: BCGConstants.Fonts.Name.ProximaNovaBold, size: 27)!
var dayValue = pickerView.selectedRowInComponent(1) + 1
let monthValue = pickerView.selectedRowInComponent(0) + 1
var yearValue = 0
let unitFlags: NSCalendarUnit = [.Day, .Month, .Year, .Weekday]
let currentDateComponents = NSCalendar.currentCalendar().components(unitFlags, fromDate: NSDate())
if monthValue > currentDateComponents.month || (dayValue >= currentDateComponents.day && monthValue == currentDateComponents.month ) {
yearValue = currentDateComponents.year
} else {
yearValue = currentDateComponents.year + 1
}
debugPrint("\(self.isGivenDaySunday(dayValue, selectedMonth: monthValue, selectedYear: yearValue)) day = \(dayValue) month = \(monthValue) )")
let sundayCheck = self.isGivenDaySunday(pickerView.selectedRowInComponent(1) + 1, selectedMonth: pickerView.selectedRowInComponent(0) + 1, selectedYear: yearValue)
if sundayCheck.isSunday {
self.startDateTextField.text = sundayCheck.sundayDate?.fullStyleDateString
self.newBootcamp?.startDate = sundayCheck.sundayDate!
} else {
// titleLabel?.font = UIFont(name: BCGConstants.Fonts.Name.ProximaNovaBold, size: 27)!
// titleLabel?.textColor = UIColor.lightGrayColor()
if dayValue > 15 {
dayValue = pickerView.selectedRowInComponent(1) - (7 - sundayCheck.nextSundayAsWeekDay)
pickerView.selectRow(dayValue, inComponent: 1, animated: true)
} else {
dayValue = pickerView.selectedRowInComponent(1) + sundayCheck.nextSundayAsWeekDay
pickerView.selectRow(dayValue, inComponent: 1, animated: true)
}
var confirmSunday = self.isGivenDaySunday(dayValue + 1, selectedMonth: monthValue, selectedYear: yearValue)
// Added by mohsin : Reason bug : selecting previous day
if confirmSunday.sundayDate?.isLessThanDate(NSDate()) == true {
confirmSunday = self.isGivenDaySunday(dayValue, selectedMonth: monthValue, selectedYear: yearValue + 1)
//TODO: Need to be verify again : If not working fine then you must try to change next commented statement and uncomment it
// dayValue = pickerView.selectedRowInComponent(1) + sundayCheck.nextSundayAsWeekDay
pickerView.selectRow(dayValue - 1, inComponent: 1, animated: true)
}
self.startDateTextField.text = confirmSunday.sundayDate?.fullStyleDateString
self.newBootcamp?.startDate = confirmSunday.sundayDate!
debugPrint(confirmSunday.sundayDate?.fullStyleDateString)
}
}
Method which checks sunday is following one
func isGivenDaySunday(selectedDay: Int, selectedMonth: Int, selectedYear: Int) -> (isSunday: Bool, nextSundayAsWeekDay: Int, sundayDate: NSDate?) { let unitFlags: NSCalendarUnit = [.Day, .Month, .Year, .Weekday]
let selectedDateComponents = NSDateComponents()
selectedDateComponents.month = selectedMonth
selectedDateComponents.day = selectedDay
selectedDateComponents.year = selectedYear
let selectedDate = NSCalendar(identifier: NSCalendarIdentifierGregorian)?.dateFromComponents(selectedDateComponents)
let newSelectedDateComponent = NSCalendar.currentCalendar().components(unitFlags, fromDate: selectedDate!)
if newSelectedDateComponent.weekday == 1 { // 1 means SUNDAY as per Gregorian
return (true, 0, selectedDate)
} else {
return (false, 8 - newSelectedDateComponent.weekday, nil)
}
}
来源：https://stackoverflow.com/questions/39593628/uidatepicker-show-only-sundays-date-only