全局常量文件在Swift中 [英] Global constants file in Swift

问题描述

在我的Objective-C项目中，我经常使用全局常量文件来存储诸如 NSUserDefaults 的通知名称和密钥之类的内容。它看起来像这样：

In my Objective-C projects I often use a global constants file to store things like notification names and keys for NSUserDefaults. It looks something like this:

@interface GlobalConstants : NSObject

extern NSString *someNotification;

@end

@implementation GlobalConstants

NSString *someNotification = @"aaaaNotification";

@end

如何在Swift中做同样的事情？

How do I do exactly the same thing in Swift?

推荐答案

IMO处理这类常量的最佳方法是创建一个Struct。

IMO the best way to deal with that type of constants is to create a Struct.

struct Constants {
    static let someNotification = "TEST"
}

然后，例如，在您的代码中将其称为：

Then, for example, call it like this in your code:

print(Constants.someNotification)

编辑：如果你想要一个更好的组织我建议你使用segmented子结构

If you want a better organization I advise you to use segmented sub structs

struct K {
    struct NotificationKey {
        static let Welcome = "kWelcomeNotif"
    }

    struct Path {
        static let Documents = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)[0] as String
        static let Tmp = NSTemporaryDirectory()
    }
}

然后你就可以了我们例如， K.Path.Tmp

Then you can just use for instance K.Path.Tmp

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