IOS Picker 组件无法显示

[bifjhh]

Do you want to request a feature or report a bug (建议还是bug) ?
bug
What is the current behavior? (现有状况)
在安卓系统可以正常显示，在ios苹果系列手机均无法显示--如图片所示，仅展示为一个黑色的框框

What is the expected behavior? （应有状况）
应该两种机型都是可以展示的才对
Which versions of React-weui, weui, and which OS and device are affected by this issue? (React-weui版本 weui版本 机型和系统)
1.1.3 iPhone7puls iOS 11