Swift Datepicker with minimum date

Question

Goord Morning all together,

i have an app with ios 8 and swift. in there is a UIViewcontroller within a UIDatepicker

I set a minimum date. for example the date of today: 2 | May | 2015 with this solution it should not be possible to set a date which is in the past

but if would like to set this date 15 | January | 2016 i set at first the day to 15 than the month to january but then the UIDatepicker goes back to the minimum date 2 May 2015

is it be possible, that wenn change the day to 15 and the month to january, that the year changes automaticly to 2016?

Answer 1

Let your minimumDate unset and try to configure it by code...

Try this:

@IBAction func changeValue(sender: UIDatePicker) 
{

    //Get time Now, and convert to a NSCalendar
    //Specify the minimun date if you want.
    let now = NSDate()
    let nowCalendar = NSCalendar.currentCalendar()
    let nowComponents = nowCalendar.components([.Day, .Month, .Year], fromDate: now)

    //Compare if date is lesser than now and then create a new date
    if nowCalendar.compareDate(sender.date, toDate: now, toUnitGranularity: [.Day, .Month, .Year]) == NSComparisonResult.OrderedAscending
    {

        let dateCalendar = NSCalendar.currentCalendar()
        let dateComponents = dateCalendar.components([.Day, .Month, .Year], fromDate: sender.date)

        dateComponents.year = nowComponents.year + 1
        let newDate = dateCalendar.dateFromComponents(dateComponents)
        sender.date = newDate!
    }

}

Answer 2

///Swift4 Version - I think it may works with 3 too.
@IBAction func changeValue(sender: UIDatePicker)
{

    //Get time Now, and convert to a NSCalendar
    //Specify the minimun date if you want.
    let now = Date()
    let nowCalendar = Calendar.current
    let nowComponents = nowCalendar.dateComponents([.day, .month, .year], from: now)

    //Compare if date is lesser than now and then create a new date
    if nowCalendar.compare(sender.date, to: now, toGranularity: Calendar.Component.day) == ComparisonResult.orderedAscending
    {
        var dateCalendar = Calendar.current
        var dateComponents = dateCalendar.dateComponents([.day, .month, .year], from: sender.date)

        guard let year = nowComponents.year else { return }

        dateComponents.year = year + 1
        let newDate = dateCalendar.date(from:dateComponents)
        sender.date = newDate!
    }
}

I published a complete example working in playground if you wish to play a little. https://gist.github.com/dedeexe/4878f78d7e1d5fe8b372ef84de629b59

Answer 3

For swift 4:

I have like this. 1. My function:

func AddDaysToToday(days: Int) -> Date? {
    var dateComponents = DateComponents()
    dateComponents.day = days

    return Func.GetCalendar(tz: .utc).date(byAdding: dateComponents, to: Date()) //you can return your own Date here.
}

2. In my VC:

    let today = DateFunc.AddDaysToToday(days: 0) datePicker.minimumDate = today