Swift IOS中月份和年份中两个NSData差异

可以按照以下方式进行操作：

let strStartDate = "September 2019"
let strEndDate = "December 2019"

//create date formatter
let formatter = DateFormatter()
formatter.dateFormat = "MMMM yyyy"

//convert string into date object
guard let startDate = formatter.date(from: strStartDate) else {
  print("invalid start date")
   return
}

 //convert string into date object
guard let endDate = formatter.date(from: strEndDate) else {
  print("invalid end date time")
  return
}

//calculate the month from end date and that should not exceed the start date
for month in 1...6 {

  if let dt = Calendar.current.date(byAdding: .month, value: -month, to: endDate) {
     if dt.compare(startDate) == .orderedAscending {
        break
      } 
      print(formatter.string(from: dt!))
  }
}

这是一种方法：

    let monthsCount = Calendar.current.dateComponents([.month], from: start, to: end).month! - 1
    guard monthsCount > 0 else { return [] }
    return (1...monthsCount).map {
        var monthYear = start
        monthYear.month! += $0
        let date = Calendar.current.date(from: monthYear)!
        let formatter = DateFormatter()
        formatter.dateFormat = "MMMM yyyy"
        return formatter.string(from: date)
    }
}

您应该DateComponents只将月份和年份组成部分传入此方法。您可以从这样的DateComponents对象中获取仅包含月份和年份的对象Date：```Calendar.current.dateComponents([.month, .year], from: someDate)