If you think you're ready to move on from the native iOS feeling of the PickerIOS, then check this DropDown alternative from Ali Najafizadeh.

react-native-dropdown on GitHub (Example)

const options = [
  {
    label: "News",
  },
  {
    label: "Design",
  },
  {
    label: "Sales",
  },
  {
    label: "Marketing",
  },
  {
    label: "Customer Success",
  },
];

return (
  <View style={styles.container}>
    <Select
      options={options}
      defaultOption={4}
      onSelect={(index) => {
        console.log(index, "is selected.");
      }}
    />
  </View>
);