swift – UIDatePicker仅显示星期日的日期？

概述我们如何设置UIDatePicker值以在 swift iOS中仅显示星期日的日期？ 最后,我自己找到了解决方案.在didSelectRow方法中检查所选日期是否是星期日???如果是,则确定,但如果没有,则重新加载组件以选择最近星期日的日期. func pickerView(pickerView：UIPickerView,didSelectRow行：Int,inComponent组件：Int){ 我们如何设置UIDatePicker值以在 swift iOS中仅显示星期日的日期？解决方法 最后,我自己找到了解决方案.在dIDSelectRow方法中检查所选日期是否是星期日???如果是,则确定,但如果没有,则重新加载组件以选择最近星期日的日期.

func pickerVIEw(pickerVIEw：UIPickerVIEw,dIDSelectRow行：Int,inComponent组件：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,animated: true)        }        var confirmSunday = self.isgivendaySunday(dayValue + 1,selectedYear: yearValue)      //  Added by mohsin : Reason BUG : selecting prevIoUs day        if confirmSunday.sundayDate?.isLessthanDate(NSDate()) == true {             confirmSunday = self.isgivendaySunday(dayValue,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,animated: true)        }        self.startDateTextFIEld.text = confirmSunday.sundayDate?.fullStyleDateString        self.newBootcamp?.startDate = confirmSunday.sundayDate!        deBUGPrint(confirmSunday.sundayDate?.fullStyleDateString)    }}

检查星期日的方法是跟随一个

func isgivendaySunday(selectedDay：Int,selectedMonth：Int,selectedYear：Int) – > (isSunday：Bool,nextSundayAsWeekDay：Int,sundayDate：NSDate？){
        let unitFlags：NSCalendarUnit = [.Day,.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,selectedDate)    } else {       return (false,8 - newSelectedDateComponent.weekday,nil)     }}

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