objective-c - 你如何将 Swift 结构/枚举合并到 Objective-C 中？

Question

场景:我已经通过 .h 桥将 Objective-C 文件公开给 Swift；所以我可以通过 Storyboard 从 .Swift 启动 Objective-C。

然而，我在 ObjC 需要的 Environment.Swift 文件中声明了一些全局枚举和结构:

enum BarButtonItem:Int {
    case cancel = 1
    case back
    case save
    case activate
    case upload
    case share
}

在 Swift 中访问枚举:

  @IBAction func navButtonAction(sender: UIBarButtonItem) {
        if let buttonItem = BarButtonItem(rawValue: sender.tag) {
            switch buttonItem {
            case .save:
                println("{(3.3)AccessBoundaries} Save.")
            default:
                println("")
            }
        }
        self.dismissViewControllerAnimated(true, completion: nil)
    }

我想在 Objective-C 文件中访问这个(和其他数据类型):

- (IBAction)barButtonAction:(UIBarButtonItem *)sender {
    BarButtonItem....?
}

Xcode 无法识别这一点。

如何将 .Swift 文件中定义的环境数据类型(或者我可以？)公开到 Objective-C 文件？
...并且，是否可以在 Objective-C 中解释 .Swift 的结构？

Answer 1

有许多 Swift 特性无法在 Objective-C 中使用。我发布了一个answer to a question前几天问了类似的问题。我会在这里重新发布答案:

根据 Apple's docs关于 Swift 和 Objective-C 的兼容性:

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:

• Generics
• Tuples
• Enumerations defined in Swift
• Structures defined in Swift
• Top-level functions defined in Swift
• Global variables defined in Swift
• Typealiases defined in Swift
• Swift-style variadics
• Nested types
• Curried functions