NSDate从Swift 2.3转换为Swift 3转换日期

问题描述

所以我刚刚更新到Xcode 8，并将Swift 2.3代码转换为Swift 3，Swift 3将所有 NSDate 转换为 Foundation日期

So I've just updated to Xcode 8 and converted my Swift 2.3 code to Swift 3, and Swift 3 just converted all NSDate to Foundation.Date

我有一个扩展名为 NSDate ，现在称为 Foundation.Date ，看起来像这样：

And I had an extension for NSDate, now calledFoundation.Date, it looked like this:

extension NSDate
{
  var firstDayOfTheMonth:NSDate
  {
     var date: NSDate?
     NSCalendar.currentCalendar().rangeOfUnit(.Month, startDate:&date , interval: nil, forDate: self)
     return date!
  }
}

Swift 3将其转换为：

And Swift 3 converted it to this:

extension Foundation.Date
{
  var firstDayOfTheMonth:Foundation.Date
  {
     var date: Foundation.Date?
    (Calendar.current as NSCalendar).range(of: .month, start:&date , interval: nil, for: self)
     return date!
  }
}

这里的问题是Xcode建议我这样做：不能将Date？类型的值转换为期望的参数类型NSDate？并将&

The problem here is that Xcode suggests me to do this : Cannot convert value of type 'Date?' to expected argument type 'NSDate?' and to drop the &.

所以，我更改它，功能现在看起来像这样：

So, I change it and the function now looks like this:

extension Foundation.Date
{
  var firstDayOfTheMonth:Foundation.Date
  {
     var date: Foundation.Date?
    (Calendar.current as NSCalendar).range(of: .month, start:date as NSDate?, interval: nil, for: self)
     return date!
  }
}

但现在Xcode说不能转换Date？类型的值，以强制类型NSDate？？/ / code $

But now Xcode says Cannot convert value of type 'Date?' to type 'NSDate?' in coercion

我该如何使这项工作？ b $ b

How can I make this work?

推荐答案

嗯，这个转换不是迁移者最好的工作; - ）

Well, this conversion is not the best work of the migrator ;-)

这是您的代码的Swift 3等价物

This is the Swift 3 equivalent of your code

extension Date
{
  var firstDayOfTheMonth:Date
  {
    var date = Date()
    var interval : TimeInterval = 0
    Calendar.current.dateInterval(of: .month, start: &date, interval: &interval, for: self)
    return date
  }
}

interval 参数似乎是强制性的，即使没有使用。

The interval parameter seems to be mandatory even if it's not used.

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