如何在NSDate中添加一个月？

Question

如何将月添加到NSDate对象？

NSDate *someDate = [NSDate Date] + 30Days.....;

Answer 1

您需要使用NSDateComponents:

NSDateComponents *dateComponents = [[NSDateComponents alloc] init];
[dateComponents setMonth:1];
NSCalendar *calendar = [NSCalendar currentCalendar];
NSDate *newDate = [calendar dateByAddingComponents:dateComponents toDate:originalDate options:0];
[dateComponents release]; // If ARC is not used, release the date components

Answer 2

使用iOS 8和OS X 10.9,您可以NSCalendarUnits使用NSCalendar以下命令添加:

Objective-C的

NSCalendar *cal = [NSCalendar currentCalendar];
NSDate *someDate = [cal dateByAddingUnit:NSCalendarUnitMonth value:1 toDate:[NSDate date] options:0];

斯威夫特3

let date = Calendar.current.date(byAdding: .month, value: 1, to: Date())

斯威夫特2

let cal = NSCalendar.currentCalendar()
let date = cal.dateByAddingUnit(.Month, value: 1, toDate: NSDate(), options: [])

Answer 3

对于swift 3.0

extension Date {
    func addMonth(n: Int) -> Date {
        let cal = NSCalendar.current
        return cal.date(byAdding: .month, value: n, to: self)!
    }
    func addDay(n: Int) -> Date {
        let cal = NSCalendar.current
        return cal.date(byAdding: .day, value: n, to: self)!
    }
    func addSec(n: Int) -> Date {
        let cal = NSCalendar.current
        return cal.date(byAdding: .second, value: n, to: self)!
    }
}

Answer 4

例如,要3在Swift中向当前日期添加月份:

let date = NSCalendar.currentCalendar().dateByAddingUnit(.MonthCalendarUnit, value: 3, toDate: NSDate(), options: nil)!

在Swift 2.0中:

let date = NSCalendar.currentCalendar().dateByAddingUnit(.Month, value: 3, toDate: NSDate(), options: [])

• 新OptionSetType结构NSCalendarUnit让您更简单地指定.Month
• 采取OptionSetType的options:参数(如参数,所采取的NSCalendarOptions)不能nil,因此传入一个空的set([])来表示"无选项".