for expo use this works for me even is there a warn but works!
import { Picker } from 'react-native'
// state
const [picked, setPicked] = useState(1.15);
<Picker
selectedValue={picked}
style={{ height: 50, width: 100 }}
onValueChange={(itemValue, itemIndex) =>
setPicked(itemValue)
}>
<Picker.Item label="Canda 5%" value={1.05} />
<Picker.Item label="Japan 8%" value={1.08} />For Expo this will work.The React native picker suggested in their expo documentation was not working for me over version of 36 react native expo sdk.
import { Picker } from 'react-native'
// state
const [picked, setPicked] = useState(1.15);
<Picker
selectedValue={picked}
style={{ height: 50, width: 100 }}
onValueChange={(itemValue, itemIndex) =>
setPicked(itemValue)
}>
<Picker.Item label="Canda 5%" value={1.05} />
<Picker.Item label="Japan 8%" value={1.08} />
<Picker.Item label="USA 10%" value={1.10} />
<Picker.Item label="Egypt 14%" value={1.14} />
<Picker.Item label="Saudi Arabia 15%" value={1.15} />
<Picker.Item label="China 16%" value={1.16} />
<Picker.Item label="Algeria 17%" value={1.17} />
<Picker.Item label="18%" value={1.18} />
<Picker.Item label="German 19%" value={1.19} />
<Picker.Item label="German 19%" value={1.20} />
</Picker>
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