Golang 实现一个接口后　方法需要传数组怎么办

interface.go

package main

import (
	"fmt"
	"reflect"
)

type Aer interface {
	GetVal() string
	SetVal(int)
}

type AA struct {
	A int
}

func (a *AA) GetVal() string {
	return fmt.Sprintf("%v", a.A)
}
func (a *AA) SetVal(i int) {
	a.A += i
}

func arrAer(al []Aer) {
	for k, v := range al {
		fmt.Printf("k=>%v v=>%v vv=>%v\n", k, v, v.GetVal())
	}
}

func aer(al Aer) {
	fmt.Printf("k=>%v v=>%v vv=>%v\n", al, al, al.GetVal())
}

func ToAer(i interface{}) []Aer {
	ua := make([]Aer, 0)
	rv := reflect.ValueOf(i)
	if rv.Kind() != reflect.Slice {
		panic("not support type")
	}
	l := rv.Len()
	for i := 0; i < l; i++ {
		iv, ok := rv.Index(i).Interface().(Aer)
		if !ok {
			panic("not support type sub index")
		}
		ua = append(ua, iv)
	}

	for _, v := range ua {
		v.SetVal(4)
	}

	return ua
}

func main() {
	al := make([]*AA, 0)
	al = append(al, &AA{A: 1})
	al = append(al, &AA{A: 2})
	al = append(al, &AA{A: 3})

	nal := ToAer(al)
	fmt.Println(al, nal)
	arrAer(nal)

	aer(al[0])
	aer(al[1])
	aer(al[2])
}