XCSourceEditorCommandInvocation swift扩展名原因“；已将无法识别的选择器发送到实例"；例外

当我尝试向

XcodeKit

（用于添加Xcode扩展的框架）中的类添加swift扩展时，编译器很乐意构建，没有任何错误，但当代码运行时，我得到以下异常：

-[XCSourceEditorCommandInvocation test]: unrecognized selector sent to instance 0x7fc60543f2b0

class SourceEditorCommand: NSObject, XCSourceEditorCommand {
    func perform(with invocation: XCSourceEditorCommandInvocation, completionHandler: @escaping (Error?) -> Void ) -> Void {
        // Call extension method
        invocation.test() // <--- Exception thrown here

        completionHandler(nil)
    }
}

extension XCSourceEditorCommandInvocation {
    func test() {
        print("it works!")
    }
}

下面是可以重现异常的示例代码：

-[XCSourceEditorCommandInvocation test]: unrecognized selector sent to instance 0x7fc60543f2b0

class SourceEditorCommand: NSObject, XCSourceEditorCommand {
    func perform(with invocation: XCSourceEditorCommandInvocation, completionHandler: @escaping (Error?) -> Void ) -> Void {
        // Call extension method
        invocation.test() // <--- Exception thrown here

        completionHandler(nil)
    }
}

extension XCSourceEditorCommandInvocation {
    func test() {
        print("it works!")
    }
}

类SourceEditorCommand:NSObject，xSourceEditorCommand{
func-perform（调用：XCSourceEditorCommandInvocation，completionHandler:@escaping（Error？->Void）->Void{
//呼叫扩展方法
目前，XcodeKit.framework中的类或类型不支持Objective-C类别和Swift扩展