我有一个下面的函数(datesCheck)循环一个日期数组,如果每天有多个条目,则首先删除所有条目,然后检查日期是否在数组中是连续的,返回连续日期的数量当前日期。
func datesCheck(_ dateArray: [Date]) -> Int {
let calendar = Calendar.current
let uniqueDates = NSSet(array: dateArray.map { calendar.startOfDay(for: $0) }).sorted {
($0 as AnyObject).timeIntervalSince1970 > ($1 as AnyObject).timeIntervalSince1970
} as! [Date]
var lastDate = calendar.startOfDay(for: Date())
var i = 0
while i < uniqueDates.count && uniqueDates[i].compare(lastDate) == .orderedSame {
lastDate = (calendar as NSCalendar).date(byAdding: .day, value: -1, to: lastDate, options: [])!
i += 1
}
numberOfConsecutiveDays = i
return i
}
此功能运作良好,但我只想将此应用于周一至周五的日期,连续日期检查器检查星期五 - 星期一,实际上忽略星期六和星期日。我试图使用calendar.components来实现这一点,但在检查日期是否连续排除时不能找到忽略周末的方法。
let today = Date()
let calendar = NSCalendar(calendarIdentifier: NSCalendar.Identifier.gregorian)
let components = calendar!.components([.weekday], fromDate: today)
if components.weekday == 2 {
print("Monday")
} else {
print("Monday")
}
答案 0 :(得分:1)
几点:
由于您不需要周末,请将其过滤掉
您的函数是非确定性的,因为它使用当前时间(Date()
)。每次运行的结果在理论上都是不同的。我添加了第二个参数fromDate
以使其具有确定性。
func datesCheck(_ dates: [Date], fromDate: Date = Date()) -> Int {
let calendar = Calendar.current
let weekdays = dates.map { calendar.startOfDay(for: $0) }
.filter { 2...6 ~= calendar.component(.weekday, from: $0) }
let uniqueDates = Set(weekdays).sorted(by: >)
var i = 0
var lastDate = calendar.startOfDay(for: fromDate)
while i < uniqueDates.count && uniqueDates[i] == lastDate {
switch calendar.component(.weekday, from: uniqueDates[i]) {
case 2:
// When the lastDate is a Monday, the previous weekday is 3 days ago
lastDate = calendar.date(byAdding: .day, value: -3, to: lastDate)!
default:
// Otherwise, it's 1 day ago
lastDate = calendar.date(byAdding: .day, value: -1, to: lastDate)!
}
i += 1
}
return i
}
测试:
let dates = [
DateComponents(calendar: .current, year: 2017, month: 8, day: 29).date!,
DateComponents(calendar: .current, year: 2017, month: 8, day: 28).date!,
DateComponents(calendar: .current, year: 2017, month: 8, day: 25).date!,
DateComponents(calendar: .current, year: 2017, month: 8, day: 24).date!,
DateComponents(calendar: .current, year: 2017, month: 8, day: 22).date!,
DateComponents(calendar: .current, year: 2017, month: 8, day: 21).date!
]
let today = DateComponents(calendar: .current, year: 2017, month: 8, day: 29).date!
print(datesCheck(dates, fromDate: today)) // 4
代码打印4,因为根据周末规则忽略了第28和第25之间的差距。