Swift 3 - 含糊不清地使用 <比较两个日期时的运算符 [英] Swift 3 - Ambiguous use of < operator when comparing two dates

问题描述

在 swift 中比较两个日期时，我可以使用 > 进行比较，但不能使用 <.startTime、endTime 和 Date() 都是 Date 类型(以前是 NSDate)

When comparing two Dates in swift, I can compare using >, but not <. startTime, endTime and Date() are all of type Date (previously NSDate)

   //Broken Code
   if Date() >= startTime && Date() < endTime
   {
       ...
   }
   Gives ambiguous use of < operator error

  //Working Code
   if Date() >= startTime && endTime > Date()
   {
       ...
   }

是否有特定原因这不起作用?

Is there a specific reason this isn't working?

我实际上是在尝试查找苹果文档时找到了这个示例，并且他们实际上使用了此代码http://www.globalnerdy.com/2016/08/29/how-to-work-with-dates-and-times-in-swift-3-part-3-date-arithmetic/

I actually found this example when trying to find the apple documentation, and they actually use this code http://www.globalnerdy.com/2016/08/29/how-to-work-with-dates-and-times-in-swift-3-part-3-date-arithmetic/

我开始怀疑是不是使用了 &&运算符，或者可能只是顺序问题，但即使是自己编写代码

I started wondering if maybe it was the using of the && operator, or possibly just being an issue of the order, but even doing the code by itself as

if startTime < endTime {...}

但它返回相同的顺序.

显然我找到了解决方法，但我很好奇为什么会发生这种情况.

Obviously I have found the workaround, But I am very curious why this is happening.

推荐答案

您可能已经扩展了 NSDate 以符合 Swift 2 中的类似协议.只需将其删除，因为 Date现在符合 Swift3 中的 Comparable 协议.

You have probably extended NSDate to conform to comparable protocol in Swift 2. Just remove it because Date now conforms to Comparable protocol in Swift3.

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