Wire up cosigner export screen in settings

Author: tanx

src/App.js

@@ -24,6 +24,7 @@ import SendPsbtScreen from './screen/send-psbt';
 import SendConfirmScreen from './screen/send-confirm';
 import SendSuccessScreen from './screen/send-success';
 import SettingsScreen from './screen/settings';
+import CosignerExportScreen from './screen/cosigner-export';
 import EmailSetScreen from './screen/email-set';
 import EmailPinScreen from './screen/email-pin';
 import EmailVerifyScreen from './screen/email-verify';
@@ -35,6 +36,7 @@ const PinChangeStack = createStackNavigator();
 const PinCheckStack = createStackNavigator();
 const RestoreStack = createStackNavigator();
 const EmailSetStack = createStackNavigator();
+const CosignerExportStack = createStackNavigator();
 const MainStack = createBottomTabNavigator();
 const RootStack = createStackNavigator();
 
@@ -139,6 +141,21 @@ const PinChangeStackScreen = () => (
   </PinChangeStack.Navigator>
 );
 
+const CosignerExportStackScreen = () => (
+  <CosignerExportStack.Navigator>
+    <CosignerExportStack.Screen
+      name="CosignerExport"
+      component={CosignerExportScreen}
+      options={{
+        title: 'Export Cosigner',
+        headerLeft: () => (
+          <HeaderBackButton label="Settings" onPress={() => nav.goBack()} />
+        ),
+      }}
+    />
+  </CosignerExportStack.Navigator>
+);
+
 const PinCheckStackScreen = () => (
   <PinCheckStack.Navigator>
     <PinCheckStack.Screen
@@ -284,6 +301,11 @@ const App = () => (
         component={PinChangeStackScreen}
         options={{headerShown: false}}
       />
+      <RootStack.Screen
+        name="CosignerExport"
+        component={CosignerExportStackScreen}
+        options={{headerShown: false}}
+      />
     </RootStack.Navigator>
   </NavigationContainer>
 );

src/screen/settings.js

@@ -14,7 +14,7 @@ const styles = StyleSheet.create({
     padding: 15,
   },
   btnWrapper: {
-    marginTop: 50,
+    marginTop: 40,
     alignItems: 'center',
   },
 });
@@ -31,6 +31,12 @@ const SettingsScreen = () => (
     <View style={styles.btnWrapper}>
       <Button title="Change PIN" onPress={() => backup.initPinChange()} />
     </View>
+    <View style={styles.btnWrapper}>
+      <Button
+        title="Export Cosigner"
+        onPress={() => multisig.initCosignerExport()}
+      />
+    </View>
     <View style={styles.btnWrapper}>
       <Button
         title="Import ColdCard"