React-native save pictures to local __react

Another very common requirement,
The description of the official document is very vague and there is a record
The official Awesomeproject/node_modules/react-native/libraries/cameraroll
According to linking libraries
Step to add the link library to the Xcode project
The next step is simple.

Presssave:function () {                 

 cameraroll.saveimagewithtag (' http://facebook.github.io/react/img/logo_og.png '), function (data) {

            console.log (data);
            Alertios.alert (
                ' Foo Title ',
                ' successful save '
            )

        }, function (err) {
            console.log (err);}
        );
    

It's OK to set this method to the Touchablehighlight Onpress property.