Before seeing react-native-image-picker comes with a choice, you can select the camera or gallery, but we have many projects use this selection pop-up box, so I wrote myself a little, the most important ios and Android are common. - first dynamic renderings
reference:
https://www.jianshu.com/p/42b4390e860e
https://www.jianshu.com/p/71c4d047b2f8