uniapp 组件的生命周期问题

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<template>  
    <view>  
        <c-picker-view-date ref="start" :date="start"></c-picker-view-date>  
    </view>  
</template>  

<script>  
import CPickerViewDate from '../c-picker-view-date/c-picker-view-date';  
export default {  
    components: {  
        CPickerViewDate  
    },  
    data() {  
        return {};  
    },  
    onShow() {  
        let start = this.$refs['start'].getDate();  
    }  
}  
</script>