swift 判断当前时间是否在一周7天的某几天固定时间段内

项目需求：根据用户选择的某时间段及7天中的某几天重复执行某种操作

步骤：1、获取当前时间，并获取当前时间对应的星期

var today = Date()
         let todayDay = TimeAndDateOperation.getweekDayWithDate(today)
//根据日期获取是星期几
    class func getweekDayWithDate(_ date : Date) ->String{
        let calensar : Calendar = Calendar.init(identifier: Calendar.Identifier.gregorian)
        let comps = (calensar as NSCalendar).component(NSCalendar.Unit.weekday, from: date)
        print("comps :\(comps)")
        var str : String = String()
        if comps == 1 {
            str = "星期一"
        }else if comps == 2 {
            str = "星期二"
        }else if comps == 3 {
            str =  "星期三"
        }else if comps == 4 {
            str =  "星期四"
        }else if comps == 5 {
            str =  "星期五"
        }else if comps == 6 {
            str =  "星期六"
        }else if comps == 7 {
            str =  "星期日"
        }
        return str
    }

2、设置日期格式，并根据传入的时间段字符串startStr、endStr、当前时间转换成Date类型

let dateFormat = DateFormatter.init()
        dateFormat.dateFormat = "HH:mm"
        
        //将日期转换成字符串
        let todayStr = dateFormat.string(from: today)
        //转换成date类型。日期置为方法默认日期
        today = dateFormat.date(from: todayStr)!
        
        //start end 格式 "2016-05-18 9:00"
        let start = dateFormat.date(from: startStr)
        let end = dateFormat.date(from: endStr)

3、日期对比

1）先对比当前日期的星期是否在传入的参数dayDay即选中的星期内（这里用的方式是存储在本地，再进行字符串包含子字符串的判断，当然也可以用数组来存储，看个人喜好），如果包含进入2），否则返回false

dateDay.contains(todayDay)

2）判断开始的时间start与结束的时间end的比较的结果（以24点为界）--两种情况

（1）结束时间在24点之前--例如：start：18:00 end：23：00

ComparisonResult.orderedAscending://end未过24点

（2）结束时间在24点之后--例如：start：18:00 end：7：00

ComparisonResult.orderedDescending://end过24点

3）根据2）的结果分别判断当前时间与开始与结束时间的比较

针对2）->（1)有三种情况：

（1）开始时间<当前时间<结束时间

(today.compare(start!)==ComparisonResult.orderedDescending)&&(today.compare(end!)==ComparisonResult.orderedAscending)

(2)开始时间=当前时间<结束时间

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(today.compare(start!)==ComparisonResult.orderedSame)&&(today.compare(end!)==ComparisonResult.orderedAscending)

(3)开始时间<当前时间=结束时间

(today.compare(start!)==ComparisonResult.orderedDescending)&&(today.compare(end!)==ComparisonResult.orderedSame)

针对2）->（2)有四种情况：

（1）开始时间<当前时间>结束时间----例如：start 18:00 now 23：00 end 7：00

(today.compare(start!)==ComparisonResult.orderedDescending)&&(today.compare(end!)==ComparisonResult.orderedDescending)

（2）开始时间>当前时间<结束时间----例如：start 18:00 now 2：00 end 7：00

(today.compare(start!)==ComparisonResult.orderedAscending)&&(today.compare(end!)==ComparisonResult.orderedAscending)

（3）开始时间=当前时间>结束时间----例如：start 18:00 now 18：00 end 7：00

(today.compare(start!)==ComparisonResult.orderedSame)&&(today.compare(end!)==ComparisonResult.orderedDescending)

（4）开始时间>当前时间=结束时间----例如：start 18:00 now 7：00 end 7：00

(today.compare(start!)==ComparisonResult.orderedAscending)&&(today.compare(end!)==ComparisonResult.orderedSame)

完整代码如下：

//判断当前时间是否在某个时间段内
    class func judgeDateByStartAndEnd(startStr : String, endStr : String, dateDay : String)->Bool{
        
        var today = Date()
         let todayDay = TimeAndDateOperation.getweekDayWithDate(today)
        let dateFormat = DateFormatter.init()
        dateFormat.dateFormat = "HH:mm"
        
        //将日期转换成字符串
        let todayStr = dateFormat.string(from: today)
        //转换成date类型。日期置为方法默认日期
        today = dateFormat.date(from: todayStr)!
        
        //start end 格式 "2016-05-18 9:00"
        let start = dateFormat.date(from: startStr)
        let end = dateFormat.date(from: endStr)
        
        //比对日期
        //1、对比是否是选中的星期中
       
        if dateDay.contains(todayDay) {
            let orderResult : ComparisonResult = (start?.compare(end!))!
            switch orderResult{
            case ComparisonResult.orderedAscending://end未过24点
                if ((today.compare(start!)==ComparisonResult.orderedDescending)&&(today.compare(end!)==ComparisonResult.orderedAscending))||((today.compare(start!)==ComparisonResult.orderedDescending)&&(today.compare(end!)==ComparisonResult.orderedSame))||((today.compare(start!)==ComparisonResult.orderedSame)&&(today.compare(end!)==ComparisonResult.orderedAscending)) {
                    return true
                }else{
                    return false
                }
            case ComparisonResult.orderedDescending://end过24点
                if ((today.compare(start!)==ComparisonResult.orderedDescending)&&(today.compare(end!)==ComparisonResult.orderedDescending))||((today.compare(start!)==ComparisonResult.orderedAscending)&&(today.compare(end!)==ComparisonResult.orderedAscending))||((today.compare(start!)==ComparisonResult.orderedSame)&&(today.compare(end!)==ComparisonResult.orderedDescending))||((today.compare(start!)==ComparisonResult.orderedAscending)&&(today.compare(end!)==ComparisonResult.orderedSame)) {
                    return true
                }else{
                    return false
                }
           default:
                return false
            }
        }else{
            return false
        }
    }

测试代码：

 let jugmentResult = TimeAndDateOperation.judgeDateByStartAndEnd(startStr: "15:30", endStr: "18:40", dateDay: "星期一,星期二,星期三,星期四,星期五,星期六,星期日")
        print("jugmentResult :\(jugmentResult)")

swift 判断当前时间是否在一周7天的某几天固定时间段内

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