Swift中Objective-C typedef枚举的平等 [英] Equality on Objective-C typedef enum in Swift

问题描述

我正在使用Swift的Facebook Objective-C SDK，我试图将FBSessionState值与枚举值进行比较。但是我得到编译器错误：

找不到接受提供的参数的'=='的重载

我基本上试图完成：

  if state == FBSessionStateOpen {...} 
  

我可以通过与值...

  if state.value == FBSessionStateOpen.value {...} 
  

但我想知道是否有办法使这项工作更像是一个Swift枚举？

解决方案

您可以使用'.value'打开枚举和常量来获取基础整数，这应该是可切换的：

  switch x.value {
 case Foo.value：
} 
  

也许这是一个错误，苹果会在将来的版本中修复它。

I'm working with the Facebook Objective-C SDK in Swift and I'm trying to compare an FBSessionState value with a value from the enum. However I get the compiler error:

Could not find an overload for '==' that accepts the supplied arguments

I'm essentially trying to accomplish:

if state == FBSessionStateOpen { ... }

I'm able to work around this by comparing against the value...

if state.value == FBSessionStateOpen.value { ... }

But I'm wondering if there is a way to make this work more like a Swift enum?

解决方案

You could unwrap the enum and constants with '.value' to get the underlying integer, which should be switchable:

switch x.value {
  case Foo.value:
}

Maybe this is a bug and apple fix it in future releases.

这篇关于Swift中Objective-C typedef枚举的平等的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！