从Objective-C调用Swift Singleton [英] Call a Swift Singleton from Objective-C

问题描述

从Objective-C访问Swift Singleton遇到麻烦.

I'm having some trouble accessing a Swift Singleton from Objective-C.

@objc class SingletonTest: NSObject {

    // swiftSharedInstance is not accessible from ObjC
    class var swiftSharedInstance: SingletonTest {
    struct Singleton {
        static let instance = SingletonTest()
        }
        return Singleton.instance
    }        
}

swiftSharedInstance无法访问.

swiftSharedInstance can not be reached.

推荐答案

目前，我有以下解决方案.也许我忽略了一些使我能够直接访问"swiftSharedInstance"的东西?

For now I have the following solution. Maybe I am overlooking something that would enable me to access "swiftSharedInstance" directly?

@objc class SingletonTest: NSObject {

    // swiftSharedInstance is not accessible from ObjC
    class var swiftSharedInstance: SingletonTest {
    struct Singleton {
        static let instance = SingletonTest()
        }
        return Singleton.instance
    }

    // the sharedInstance class method can be reached from ObjC
    class func sharedInstance() -> SingletonTest {
        return SingletonTest.swiftSharedInstance
    }

    // Some testing
    func testTheSingleton() -> String {
        return "Hello World"
    }

}

然后在ObjC中，我可以获取sharedInstance类方法(在导入xcode生成的swift标头绑定之后)

Then in ObjC I can get the sharedInstance class method (after importing the xcode generated swift header bindings)

SingletonTest *aTest = [SingletonTest sharedInstance];
NSLog(@"Singleton says: %@", [aTest testTheSingleton]);

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