objective-c – 在Obj-C中使用Swift协议的实现

Swift协议及其实现：

@objc public protocol TheProtocol {
    func someMethod()
}

@objc public class SwiftClass: NSObject,TheProtocol {
    public func someMethod() {
        print("someMethod Swift")
    }
}

ObjC-协议的实施：

#import "SwiftAndObjC-Swift.h"
@interface ObjCClass : NSObject <TheProtocol>
- (void) someMethod;
@end


@implementation ObjCClass
- (void) someMethod
{
    NSLog(@"someMethod ObjC");
}
@end

我的问题是如何在ObjC中定义一些能够引用SwiftClass或ObjCClass的类型.例如,这不编译：

#import "SwiftAndObjC-Swift.h"
...
TheProtocol *p = [[ObjCClass alloc] init];
// Error: "Use of undeclared identifier TheProtocol"

这将编译：

@class TheProtocol
TheProtocol *p = [[ObjCClass alloc] init];

但不能使用p：

@class TheProtocol
TheProtocol *p = [[ObjCClass alloc] init];
[p someMethod];
// Error: Receiver type "The Protocol" is a forward declaration"

(将转换添加到赋值和/或方法调用没有帮助)

有解决方案吗