我是iOS和编程方面的新手,从本月的第一天到今天,我需要某种方式来获取数组。到今天为止的过去3个月中只有一个阵列,但是我不知道该怎么做,请提供任何帮助或想法?
我检查了一下以获得月的第一天:
extension Date {
func startOfMonth() -> Date? {
let comp: DateComponents = Calendar.current.dateComponents([.year, .month, .hour], from: Calendar.current.startOfDay(for: self))
return Calendar.current.date(from: comp)!
}
但是它只能在ViewController中工作,如果在我项目的其他部分执行该操作怎么办?而且我也不知道如何迭代数组以获取第一天到今天之间的所有时间...
编辑
我做了这样的事情,但它给了马一个无限循环..我在做什么错?
func weatherDatesFromCurrentDayMonth() -> [Any] {
var date = Date()
let currentCalendar = Calendar.current
var dateComponents = DateComponents()
dateComponents.month = -1
// dateComponents.day = 1
let endingDate = Calendar.current.date(byAdding: dateComponents, to: date)
print("\(endingDate!)")
var datesArray = Array<Any>()
while date.compare(endingDate!) != ComparisonResult.orderedAscending
{
var dateComponents = DateComponents()
dateComponents.day = 1
date = Calendar.current.date(byAdding: dateComponents, to: date)!
datesArray.append(date)
print("\(datesArray)")
}
return [datesArray]
}
最佳答案
您之所以无休止地循环,是因为开始时您的endingDate
已经在一个月前,而date
现在已经在一个月了。由于在循环中您只增加date
,所以它永远不会一直在endingDate
之后,因此您的条件始终是true
试试这个代码:
func weatherDatesFromCurrentDayMonth() -> [Date] {
let now = Date()
var currentDate = previousMonth(date: now)
var datesArray = [Date]()
while currentDate < now {
datesArray.append(currentDate)
currentDate = nextDay(date:currentDate)
}
print("result: \(datesArray)")
return datesArray
}
func nextDay(date: Date) -> Date {
var dateComponents = DateComponents()
dateComponents.day = 1
return Calendar.current.date(byAdding: dateComponents, to: date)!
}
func previousMonth(date: Date) -> Date {
var dateComponents = DateComponents()
dateComponents.month = -1
return Calendar.current.date(byAdding: dateComponents, to: date)!
}
关于ios - 从每月的第一天到今天,获取一系列天数,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/40364663/