JavascriptCore 不从类中导出方法

我正在尝试从 swift 类的单例实例中调用方法。

这是我的协议(protocol):

@objc public protocol MyProtocol: JSExport { 
 
    var name: String { get set } 
 
    func sum(a:Int, b: Int) -> Int 
} 

这是我的类(class):

private let sharedInstance = MySingleton() 
 
@objc public class MySingleton: NSObject, MyProtocol { 
 
    // Singleton 
    public class var sharedApp : MySingleton { 
 
        return sharedInstance 
    }     
 
    public var username: String 
 
    override private init() { 
 
        self.username = "Oscar" 
 
        super.init() 
    } 
 
    public func sum(a: Int, b: Int) -> Int { 
 
        return a + b 
    } 
} 

我进行了一些测试。当我访问它传递的属性时:

func testName() { 
 
    var virtualMachine = JSVirtualMachine() 
    js = JSContext(virtualMachine: virtualMachine) 
 
    var singleton: MySingleton = MySingleton.sharedApp 
 
    self.context.setObject( 
        singleton.self, 
        forKeyedSubscript: "Singleton") 
 
    let name = js.evaluateScript("Singleton.username").toString() 
 
    XCTAssertTrue(name == "Oscar", "Name is not Colossal, was " + name); // PASS!!!!! 
} 

但是，当我调用一个方法时它失败了:

func testSum() { 
 
    var virtualMachine = JSVirtualMachine() 
    js = JSContext(virtualMachine: virtualMachine) 
 
    var singleton: MySingleton = MySingleton.sharedApp 
 
    self.context.setObject( 
        singleton.self, 
        forKeyedSubscript: "Singleton") 
 
    let name = js.evaluateScript("Singleton.sum(3, 2);").toInt32() 
 
    XCTAssertTrue(sum == 5, "Sum was " + String(sum)); // Fails. Says sum was 0 
} 

它仅在从 Javascript 对象读取/写入属性时有效，在调用方法时无效....

我做错了什么？

请您参考如下方法:

我刚刚找到了解决方案。试试这个。

func sum(a:Int, _ /* <-- make this argument unnamed */ b: Int) -> Int 

JSExport 似乎还不支持命名参数。