react-native-alertui
if you want to have a same alert dialog ui on android and ios,you can use react-native-alertui,it provide a common component for both android and ios platform.
previews
example
cd example && npm install
usage
npm install react-native-alertui --save
now you can use AlertUI maybe with the code below.
<AlertUI title = 'Alert' message = 'this is a message from alertui' buttons = text:'OK' {/*dosth*/} text:'Cancel' {/*dosth*/} />