This project forked from liuc520/react-native-city-pick
####1、里面有两种城市的选择模式，一个是picker模式，一个是列表模式；
####2、其中picker模式采用的是react-native-picker，里面只有两层的目录结构，如果需要三层的用作者的那个就可以了
####3、列表模式是我们最常用的，再次采用的方法是计算出城市列表的高度，点击右侧的index字母索引就可以对应到相应的字母对应的城市列表，各位请看下图
####4、如果要运行我的代码，需要先下载下来 git clone https://github.com/LiuC520/react-native-city-pick/
####5、然后 npm i
####6、然后react-native run-android 或者 react-native run-ios
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