在Objective-C中访问Swift选项设置

In my Swift class, I have an OptionSetType defined for fulfillment options.

在我的Swift类中，我有一个为履行选项定义的选项。

struct FulfillmentOption : OptionSetType {
    let rawValue: Int

    static let Pickup = FulfillmentOption(rawValue: 1 << 0)
    static let Shipping = FulfillmentOption(rawValue: 1 << 1)
    static let UserShipping = FulfillmentOption(rawValue: 1 << 2)
}

I then create a variable to add/remove and read options. This works as expected.

然后我创建一个变量来添加/删除和读取选项。这是预期。

 var options: FulfillmentOption = []
 options.insert(FulfillmentOption.Pickup)
 options.contains(FulfillmentOption.Pickup)

However I need to access the options variable from one of my Objective-C classes. Since OptionSetType is not defined in Objective-C, the variable is not visible to any of my Objective-C classes.

但是，我需要从一个Objective-C类访问options变量。由于OptionSetType在Objective-C中没有定义，所以我的任何Objective-C类都看不到这个变量。

What is the best way for me to expose this to Objective-C? Should I stop using OptionSetType altogether?

对我来说，将其暴露给Objective-C的最佳方式是什么?我应该完全停止使用OptionSetType吗?

I've considered doing creating public and private variables like this to convert between the two. I don't love this, but it's the best I've come up with thus far.

我考虑过创建这样的公共和私有变量来在两者之间进行转换。我不喜欢这个，但这是我到目前为止想出的最好的。

private var _options: FulfillmentOptions = []
private var options: UInt {
  get {
    // get raw value from _options
  }
  set {
    // set raw value to _options
  }
}

Is there a more elegant way to accomplish this? I'd like to avoid writing unnecessary code.

有没有更优雅的方式来实现这一点?我想避免写不必要的代码。

1 个解决方案

#1

Not a direct answer to your question, but as an alternative you can work the other way around. Define

不是直接回答你的问题，但作为替代，你可以用另一种方法。定义

typedef NS_OPTIONS(NSInteger, FulfillmentOption) {
    FulfillmentOptionPickup = 1 << 0,
    FulfillmentOptionShipping = 1 << 1,
    FulfillmentOptionUserShipping = 1 << 2,
};

in an Objective-C header, this would be imported into Swift as

在Objective-C标题中，这将被导入Swift。

public struct FulfillmentOption : OptionSetType {
    public init(rawValue: Int)

    public static var Pickup: FulfillmentOption { get }
    public static var Shipping: FulfillmentOption { get }
    public static var UserShipping: FulfillmentOption { get }
}

More Information can be found in the "Using Swift with Cocoa and Objective-C" reference:

更多的信息可以在“使用Swift与Cocoa和Objective-C”中找到:

"Interaction with C APIs":
“与C api交互”:

Swift also imports C-style enumerations marked with the NS_OPTIONS macro as a Swift option set. Option sets behave similarly to imported enumerations by truncating their prefixes to option value names.

Swift还导入以NS_OPTIONS宏作为Swift选项集标记的c风格枚举。

"Swift and Objective-C in the Same Project":
“Swift and Objective-C in the Same Project”:

You’ll have access to anything within a class or protocol that’s marked with the @objc attribute as long as it’s compatible with Objective-C. This excludes Swift-only features such as those listed here:

只要@objc属性与Objective-C兼容，您就可以访问类或协议中的任何内容。这就排除了只有swift的特性，比如这里列出的:

...

…

Structures defined in Swift

结构中定义的迅速

...

…

#1