Magic.m

@implementation NSObject (forSwift)

- (id)__performSelector:(SEL)aSelector
{
    Method m = class_getInstanceMethod(self.class, aSelector);
    const char *types = method_copyReturnType(m);
    if (strcmp("v", types)) {
        return [self performSelector:aSelector];
    } else {
        [self performSelector:aSelector];
        return nil;
    }
}

- (void)addMethod:(void(^)())rambda
{
    id class = [self class];
    SEL sel = @selector(hoge);
    IMP imp = imp_implementationWithBlock(rambda);
    Method method = class_getInstanceMethod(class, sel);
    
    class_addMethod(class, sel, imp, "v");
}

@end