RCTViewSnapshotManager.h

//React/Views/RCTViewSnapshotManager.h
//
//  RCTViewSnapshot.h
//  React
//
//  Created by Kaila, Ashish on 7/30/15.
//  Copyright (c) 2015 Facebook. All rights reserved.
//

#import "RCTViewManager.h"

@interface RCTViewSnapshotManager : RCTViewManager
@property (nonatomic, strong) NSNumber* sourceViewRef;
@end

RCTViewSnapshotManager.m

React/Views/RCTViewSnapshotManager.m
//
//  RCTViewSnapshot.m
//  React
//
//  Created by Kaila, Ashish on 7/30/15.
//  Copyright (c) 2015 Facebook. All rights reserved.
//

#import "RCTViewSnapshotManager.h"
#import "RCTUIManager.h"

@implementation RCTViewSnapshotManager

RCT_EXPORT_MODULE()
@synthesize bridge = _bridge;
@synthesize methodQueue = _methodQueue;

- (UIView *)view
{
  UIView* sourceView;
  
  if ((!self.bridge) || (!(sourceView = [self.bridge.uiManager viewForReactTag:self.sourceViewRef]))) {
    return [super view];
  }
  
  UIView* snapshot = [sourceView snapshotViewAfterScreenUpdates:NO];
  snapshot.frame = sourceView.bounds;
  
  return snapshot;
}

RCT_EXPORT_VIEW_PROPERTY(sourceViewRef, NSNumber)
@end

react-native.js

//Lbraries/react-native/react-native.js
  SegmentedControlIOS: require('SegmentedControlIOS'),
  SliderIOS: require('SliderIOS'),
  SwitchIOS: require('SwitchIOS'),
+ SnapshotView: require('SnapshotView'),
  TabBarIOS: require('TabBarIOS'),
  Text: require('Text'),
  TextInput: require('TextInput'),

SnapshotView.js

//Libraries/Components/SnapshotView/SnapshotView.js
"use strict";

var React = require("React");
var requireNativeComponent = require("requireNativeComponent");

class SnapshotView extends React.Component {
  render() {
    return <RCTViewSnapshot {...this.props} />;
  }
}

SnapshotView.propTypes = {
  /**
   * Reference tag of the source view that is to be snapshot
   */
  sourceViewRef: React.PropTypes.number,
};

var RCTViewSnapshot = requireNativeComponent("RCTViewSnapshot", SnapshotView);

module.exports = SnapshotView;