h5页面input组件focus在ios下无法调起软键盘

<input type="text" confirm-type="search" :focus="focus" placeholder="请输入要搜索的内容" v-model="value"
placeholder-class="plinput" @confirm="onConfirm" />

onLoad() {
setTimeout(() => {
this.$set(this,'focus',true);
console.log('this.focus', this.focus);
}, 200)
},
上面是代码，希望有人可以稍微帮忙看一下