swift - 使用 NSDate() 快速创建 future 日期

Question

我收到一个错误:“调用中缺少参数‘coder’的参数”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#>)

任何人都可以看到我错过了什么吗？我没有看到名为“coder”的参数是必需的。

Answer 1

看起来怎么样

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))

---

swift 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))

---

目标-C

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