CODEWITHSUNDEEP
objective-cswiftobjective-c-runtime
lukas
lukas

Reputation: 2410

objc_getClass: load swift class inheriting NSObject

I'm trying to dynamically load a Swift class inheriting from NSObject using the objc runtime. (I'm trying to load the class from ObjC, not from Swift)

My Swift class:

@objc public class TestClass : NSObject {

    @objc public func testMethod() -> String {
        return "String"
    }

}

According to Apple's documentation,

The @objc attribute makes your Swift API available in Objective-C and the Objective-C runtime

But the result of objc_getClass("TestClass") is (null).

Am I doing something wrong? Or is it not possible at all to load swift classes inheriting an ObjC class using the objc runtime?

Upvotes: 2

Views: 1494

Answers (2)

JAL
JAL

Reputation: 42449

You need to specify an Objective-C name for your class, not just include @objc:

@objc(TestClass) public class TestClass : NSObject {

    @objc public func testMethod() -> String {
        return "String"
    }

}

NSClassFromString("TestClass") // TestClass.Type

objc_getClass("TestClass") // TestClass

Otherwise your class will not be registered with the Objective-C runtime, and calls like objc_getClass or NSClassFromString will return nil.

Upvotes: 4

Andrey Chernukha
Andrey Chernukha

Reputation: 21808

What if you try objc_getClass("YourAppName.TestClass")? Most likely the module name is prepended. You can verify the exact name which is used behind the scenes by using NSStringFromClass([TestClass class])

Upvotes: 2

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