oc 继承 swift 类
18年时的文章，内容过期。
项目中使用 oc 继承 swift 类编译器报错：
Cannot subclass a class that was declared with the 'objc_subclassing_restricted' attribute
oc 继承前增加 objc_subclassing_restricted 注释，实现对 swift 类的继承。
Swift 类:
import Foundation
class SwiftClass : NSObject {
func say() {
print("hi");
}
}
Objc 类:
#import <Foundation/Foundation.h>
#import "test-Swift.h"
#define SWIFT_SUBCLASS __attribute__((objc_subclassing_restricted))
SWIFT_SUBCLASS
@interface ObjcClass : SwiftClass
- (instancetype)init;
@end
@implementation ObjcClass
- (void)say {
NSLog(@"oops");
}
@end
