1,獲取當前月天數
//計算當月天數
func getDaysInCurrentMonth() -> Int {
let calendar = NSCalendar.currentCalendar()
let date = NSDate()
let nowComps = calendar.components([.Year, .Month, .Day], fromDate: date)
let year = nowComps.year
let month = nowComps.month
let startComps = NSDateComponents()
startComps.day = 1
startComps.month = month
startComps.year = year
let endComps = NSDateComponents()
endComps.day = 1
endComps.month = month == 12 ? 1 : month + 1
endComps.year = month == 12 ? year + 1 : year
let startDate = calendar.dateFromComponents(startComps)!
let endDate = calendar.dateFromComponents(endComps)!
let diff = calendar.components(.Day, fromDate: startDate, toDate: endDate,
options: .MatchFirst)
return diff.day
}
測試代碼:
let days = getDaysInCurrentMonth()
print("本月有\(days)天")
2,獲取指定年月的天數
//計算指定月天數
func getDaysInMonth( year: Int, month: Int) -> Int
{
let calendar = NSCalendar.currentCalendar()
let startComps = NSDateComponents()
startComps.day = 1
startComps.month = month
startComps.year = year
let endComps = NSDateComponents()
endComps.day = 1
endComps.month = month == 12 ? 1 : month + 1
endComps.year = month == 12 ? year + 1 : year
let startDate = calendar.dateFromComponents(startComps)!
let endDate = calendar.dateFromComponents(endComps)!
let diff = calendar.components(.Day, fromDate: startDate, toDate: endDate,
options: .MatchFirst)
return diff.day
}
測試代碼:
let days = getDaysInMonth(2016, month: 2)
print("2016年2月有\(days)天")