Modal.alert有几率会出现抖动现象（Modal.alert is rembled）

[ljh257110]

• [ ] I have searched the issues of this repository and believe that this is not a duplicate.

Reproduction link

https://bat100-dev.oss-cn-qingdao.aliyuncs.com/file/f290934d69cd.mp4

Steps to reproduce

Modal.alert('货到付款提醒', '货到付款订单，采购商收货后在线付款或开具电子承兑汇票，请确认后接单', [ { text: '返回', onPress: () => { }, style: 'cancel', }, { text: '确认接单', onPress: () => confirmOrderFun(item, props) } ]);

What is expected?

normally appear （modal正常显示）

What is actually happening?

modal is rembled（modal会出现抖动现象，应该说几率非常小，但不知是什么原因）

Environment	Info
antd	3.2.2
React	0.63.2
System	ios or xiaomi8
Browser	app

[1uokun]

Duplicate of https://github.com/ant-design/ant-design-mobile-rn/issues/1095