使用NSDate()在swift中创建未来日期

Question

我收到一个错误:"在调用中缺少参数'coder'的参数"以获取以下代码:

var components = NSDateComponents()     
components.setValue(1,forComponent: NSCalendarUnit.CalendarUnitMonth);
var expirationDate = NSCalendar.currentCalendar().dateByAddingComponents(components,       toDate: NSDate(),options:0)

文档要求:

NSCalendar.currentCalendar().dateByAddingComponents(<#comps: NSDateComponents?#>, toDate: <#NSDate?#>, options: <#NSCalendarOptions#>)

任何人都能看到我错过的东西吗？我没有看到名为'coder'的参数需要.

Answer 1

它看起来如何

swift 4.x

let date = Date()
var components = DateComponents()
components.setValue(1, for: .month)
let expirationDate = Calendar.current.date(byAdding: components, to: date)

swift 2.0

let components: NSDateComponents = NSDateComponents()
components.setValue(1, forComponent: NSCalendarUnit.Month);
let date: NSDate = NSDate()
let expirationDate = NSCalendar.currentCalendar().dateByAddingComponents(components, toDate: date, options: NSCalendarOptions(rawValue: 0))

迅捷1.2

var components = NSDateComponents()
components.setValue(1, forComponent: NSCalendarUnit.CalendarUnitMonth);
let date: NSDate = NSDate()
var expirationDate = NSCalendar.currentCalendar().dateByAddingComponents(components, toDate: date, options: NSCalendarOptions(0))

Objective-C的

NSDate *date = [NSDate new];  
NSDateComponents *components = [NSDateComponents new];
components.month = 1;
NSDate *expirationDate = [[NSCalendar currentCalendar] dateByAddingComponents:components toDate:date options:0];

Answer 2

Swift 3的语法

var components = DateComponents()
components.setValue(1, forComponent: .month)
let date: Date = Date()
let expirationDate = Calendar.current.date(byAdding: components, to: date, options: [])

Answer 3

最新的Swift 3语法:

var components = DateComponents()
components.setValue(1, for: .month)
let date: Date = Date()
let expirationDate = Calendar.current.date(byAdding: components, to: date)