证明Block是对象

        int  age = 10;

        void (^test)(void) = ^ {

            NSLog(@"xxxx, %d", age);

        };

    

       id t = (id)(test);

 NSLog(@"%@, %@, %@", object_getClass(t), object_getClass(object_getClass(t)), object_getClass(object_getClass(object_getClass(t))));

    

        CGSize size = {20, 30};

        打印的结果如下：

        2018-06-30 12:50:51.387251+0800 Test[1610:4904089] __NSMallocBlock__, __NSMallocBlock__, NSObject