有什么方法可以使用反射设置界面字段？当我尝试设置它时，它惊慌地说该值不可寻址。

type A interface{...}

func CreateA(name string) A {...}

type B struct {
   field A
   should A
   mirror A
}

// normal way of initializing
var b = B{
  field: CreateA("field"),
  should: CreateA("should"),
  mirror: CreateA("mirror"),
}

func MirrorField(b *B) {
   t := reflect.TypeOf(b)
   v := reflect.ValueOf(b)
   for i := 0; i < t.NumField(); i++ {
      setTo = CreateA(t.Field(1).Name)
      fieldVal := v.Field(i)
      fieldVal.Set(reflect.ValueOf(setTo))
   }
}

// what i want is something like
var b = &B{}
MirrorField(b)