Question

Goord Morning一起来，

我有一个带有ios 8和swift的应用程序。在UIViewcontroller

中有一个UIDatepicker

我设定了最短日期。例如今天的日期：2 |五月| 2015年使用此解决方案，不应该设置过去的日期

但是如果想将此日期设置为15 |一月| 2016 我在第一天开始设置为15 比1月到1月，但UIDatepicker回到2015年5月2日的最短日期

是否有可能，将当天改为15，将月份改为1月，那一年会自动变为2016年？

Answer 1

让你的minimumDate取消设置并尝试按代码配置...

试试这个：

@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!
    }
}

如果你想玩一点，我发表了一个在操场上工作的完整例子。 https://gist.github.com/dedeexe/4878f78d7e1d5fe8b372ef84de629b59

Answer 3

对于swift 4：

我喜欢这个。 1.我的职能：

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.
}

在我的VC中：

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

Swift Datepicker，最短日期

3 个答案: