Add support for selecting media from library

Summary:
This PR adds support for UIImagePickerController to allow selecting a photo / video from the users camera roll.

![ios simulator screen shot jun 14 2015 4 50 03 pm](https://cloud.githubusercontent.com/assets/688326/8147758/ae6dc8d4-12b6-11e5-80f0-2bcaa964a5d8.png)

Example:

Selecting something from camera roll
```
ImagePickerIOS.openSelectDialog(<config>, <successCallback>, <cancelCallback>);

ImagePickerIOS.openSelectDialog({
   showImages: true, // defaults to true
   showVideos: false // defaults to false
}, function (data) {
  console.info("Got a callback!");
  console.info(data); // file URL as in assets-library://asset/asset.JPG?id=E2741A73-D185-44B6-A2E6-2D55F69CD088&ext=JPG
}, function() {
  console.info("Cancelled");
});
```

Using camera
```
ImagePickerIOS.openCameraDialog(<config>, <successCallback>, <cancelCallback>);

ImagePickerIOS.openSelectDialog({
   videoMode: false, // defaults to true, whether to record videos instead
}, function (data) {
  console.info("Got
Closes https://github.com/facebook/react-native/pull/1620
Github Author: David Mohl <me@dave.cx>

Test Plan: Imported from GitHub, without a `Test Plan:` line.

Libraries/Image/ImagePickerIOS.js

@@ -0,0 +1,40 @@
+/**
+ * Copyright (c) 2015-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ *
+ * @providesModule ImagePickerIOS
+ * @flow
+ */
+'use strict';
+
+var RCTImagePicker = require('NativeModules').ImagePickerIOS;
+
+var ImagePickerIOS = {
+  canRecordVideos: function(callback: Function) {
+    return RCTImagePicker.canRecordVideos(callback);
+  },
+  canUseCamera: function(callback: Function) {
+    return RCTImagePicker.canUseCamera(callback);
+  },
+  openCameraDialog: function(config: Object, successCallback: Function, cancelCallback: Function) {
+    config = {
+      videoMode: false,
+      ...config,
+    }
+    return RCTImagePicker.openCameraDialog(config, successCallback, cancelCallback);
+  },
+  openSelectDialog: function(config: Object, successCallback: Function, cancelCallback: Function) {
+    config = {
+      showImages: true,
+      showVideos: false,
+      ...config,
+    }
+    return RCTImagePicker.openSelectDialog(config, successCallback, cancelCallback);
+  },
+};
+
+module.exports = ImagePickerIOS;

Libraries/Image/RCTImage.xcodeproj/project.pbxproj

@@ -11,6 +11,7 @@
 		1304D5AC1AA8C4A30002E2BE /* RCTStaticImageManager.m in Sources */ = {isa = PBXBuildFile; fileRef = 1304D5AA1AA8C4A30002E2BE /* RCTStaticImageManager.m */; };
 		1304D5B21AA8C50D0002E2BE /* RCTGIFImage.m in Sources */ = {isa = PBXBuildFile; fileRef = 1304D5B11AA8C50D0002E2BE /* RCTGIFImage.m */; };
 		1345A8391B26592900583190 /* RCTImageRequestHandler.m in Sources */ = {isa = PBXBuildFile; fileRef = 1345A8381B26592900583190 /* RCTImageRequestHandler.m */; };
+		137620351B31C53500677FF0 /* RCTImagePickerManager.m in Sources */ = {isa = PBXBuildFile; fileRef = 137620341B31C53500677FF0 /* RCTImagePickerManager.m */; };
 		143879351AAD238D00F088A5 /* RCTCameraRollManager.m in Sources */ = {isa = PBXBuildFile; fileRef = 143879341AAD238D00F088A5 /* RCTCameraRollManager.m */; };
 		143879381AAD32A300F088A5 /* RCTImageLoader.m in Sources */ = {isa = PBXBuildFile; fileRef = 143879371AAD32A300F088A5 /* RCTImageLoader.m */; };
 		58B5118F1A9E6BD600147676 /* RCTImageDownloader.m in Sources */ = {isa = PBXBuildFile; fileRef = 58B5118A1A9E6BD600147676 /* RCTImageDownloader.m */; };
@@ -39,6 +40,8 @@
 		1304D5B11AA8C50D0002E2BE /* RCTGIFImage.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = RCTGIFImage.m; sourceTree = "<group>"; };
 		1345A8371B26592900583190 /* RCTImageRequestHandler.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = RCTImageRequestHandler.h; sourceTree = "<group>"; };
 		1345A8381B26592900583190 /* RCTImageRequestHandler.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = RCTImageRequestHandler.m; sourceTree = "<group>"; };
+		137620331B31C53500677FF0 /* RCTImagePickerManager.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = RCTImagePickerManager.h; sourceTree = "<group>"; };
+		137620341B31C53500677FF0 /* RCTImagePickerManager.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = RCTImagePickerManager.m; sourceTree = "<group>"; };
 		143879331AAD238D00F088A5 /* RCTCameraRollManager.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = RCTCameraRollManager.h; sourceTree = "<group>"; };
 		143879341AAD238D00F088A5 /* RCTCameraRollManager.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = RCTCameraRollManager.m; sourceTree = "<group>"; };
 		143879361AAD32A300F088A5 /* RCTImageLoader.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = RCTImageLoader.h; sourceTree = "<group>"; };
@@ -74,6 +77,8 @@
 				1304D5B11AA8C50D0002E2BE /* RCTGIFImage.m */,
 				58B511891A9E6BD600147676 /* RCTImageDownloader.h */,
 				58B5118A1A9E6BD600147676 /* RCTImageDownloader.m */,
+				137620331B31C53500677FF0 /* RCTImagePickerManager.h */,
+				137620341B31C53500677FF0 /* RCTImagePickerManager.m */,
 				1345A8371B26592900583190 /* RCTImageRequestHandler.h */,
 				1345A8381B26592900583190 /* RCTImageRequestHandler.m */,
 				58B5118B1A9E6BD600147676 /* RCTNetworkImageView.h */,
@@ -155,6 +160,7 @@
 			buildActionMask = 2147483647;
 			files = (
 				58B5118F1A9E6BD600147676 /* RCTImageDownloader.m in Sources */,
+				137620351B31C53500677FF0 /* RCTImagePickerManager.m in Sources */,
 				58B511911A9E6BD600147676 /* RCTNetworkImageViewManager.m in Sources */,
 				1304D5AC1AA8C4A30002E2BE /* RCTStaticImageManager.m in Sources */,
 				1345A8391B26592900583190 /* RCTImageRequestHandler.m in Sources */,

Libraries/Image/RCTImagePickerManager.h

@@ -0,0 +1,15 @@
+/*
+ *  Copyright (c) 2013, Facebook, Inc.
+ *  All rights reserved.
+ *
+ *  This source code is licensed under the BSD-style license found in the
+ *  LICENSE file in the root directory of this source tree. An additional grant
+ *  of patent rights can be found in the PATENTS file in the same directory.
+ *
+ */
+
+#import "RCTBridgeModule.h"
+
+@interface RCTImagePickerManager : NSObject <RCTBridgeModule>
+
+@end

Libraries/Image/RCTImagePickerManager.m

@@ -0,0 +1,135 @@
+/*
+ *  Copyright (c) 2013, Facebook, Inc.
+ *  All rights reserved.
+ *
+ *  This source code is licensed under the BSD-style license found in the
+ *  LICENSE file in the root directory of this source tree. An additional grant
+ *  of patent rights can be found in the PATENTS file in the same directory.
+ *
+ */
+
+#import "RCTImagePickerManager.h"
+#import "RCTRootView.h"
+
+#import <UIKit/UIKit.h>
+
+#import <MobileCoreServices/UTCoreTypes.h>
+
+@interface RCTImagePickerManager ()<UIImagePickerControllerDelegate, UINavigationControllerDelegate>
+
+@end
+
+@implementation RCTImagePickerManager
+{
+  NSMutableArray *_pickers;
+  NSMutableArray *_pickerCallbacks;
+  NSMutableArray *_pickerCancelCallbacks;
+}
+
+RCT_EXPORT_MODULE(ImagePickerIOS);
+
+- (instancetype)init
+{
+  if ((self = [super init])) {
+    _pickers = [[NSMutableArray alloc] init];
+    _pickerCallbacks = [[NSMutableArray alloc] init];
+    _pickerCancelCallbacks = [[NSMutableArray alloc] init];
+  }
+  return self;
+}
+
+RCT_EXPORT_METHOD(canRecordVideos:(RCTResponseSenderBlock)callback)
+{
+  NSArray *availableMediaTypes = [UIImagePickerController availableMediaTypesForSourceType:UIImagePickerControllerSourceTypeCamera];
+  callback(@[@([availableMediaTypes containsObject:(NSString *)kUTTypeMovie])]);
+}
+
+RCT_EXPORT_METHOD(canUseCamera:(RCTResponseSenderBlock)callback)
+{
+  callback(@[@([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera])]);
+}
+
+RCT_EXPORT_METHOD(openCameraDialog:(NSDictionary *)config
+                  successCallback:(RCTResponseSenderBlock)callback
+                  cancelCallback:(RCTResponseSenderBlock)cancelCallback)
+{
+  UIWindow *keyWindow = [[UIApplication sharedApplication] keyWindow];
+  UIViewController *rootViewController = keyWindow.rootViewController;
+
+  UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];
+  imagePicker.delegate = self;
+  imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;
+
+  if ([config[@"videoMode"] boolValue]) {
+    imagePicker.cameraCaptureMode = UIImagePickerControllerCameraCaptureModeVideo;
+  }
+
+  [_pickers addObject:imagePicker];
+  [_pickerCallbacks addObject:callback];
+  [_pickerCancelCallbacks addObject:cancelCallback];
+
+  [rootViewController presentViewController:imagePicker animated:YES completion:nil];
+}
+
+RCT_EXPORT_METHOD(openSelectDialog:(NSDictionary *)config
+                  successCallback:(RCTResponseSenderBlock)callback
+                  cancelCallback:(RCTResponseSenderBlock)cancelCallback)
+{
+  UIWindow *keyWindow = [[UIApplication sharedApplication] keyWindow];
+  UIViewController *rootViewController = keyWindow.rootViewController;
+
+  UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];
+  imagePicker.delegate = self;
+  imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
+
+  NSMutableArray *allowedTypes = [[NSMutableArray alloc] init];
+  if ([config[@"showImages"] boolValue]) {
+    [allowedTypes addObject:(NSString *)kUTTypeImage];
+  }
+  if ([config[@"showVideos"] boolValue]) {
+    [allowedTypes addObject:(NSString *)kUTTypeMovie];
+  }
+
+  imagePicker.mediaTypes = allowedTypes;
+
+  [_pickers addObject:imagePicker];
+  [_pickerCallbacks addObject:callback];
+  [_pickerCancelCallbacks addObject:cancelCallback];
+
+  [rootViewController presentViewController:imagePicker animated:YES completion:nil];
+}
+
+- (void)imagePickerController:(UIImagePickerController *)picker
+didFinishPickingMediaWithInfo:(NSDictionary *)info
+{
+  NSUInteger index = [_pickers indexOfObject:picker];
+  RCTResponseSenderBlock callback = _pickerCallbacks[index];
+
+  [_pickers removeObjectAtIndex:index];
+  [_pickerCallbacks removeObjectAtIndex:index];
+  [_pickerCancelCallbacks removeObjectAtIndex:index];
+
+  UIWindow *keyWindow = [[UIApplication sharedApplication] keyWindow];
+  UIViewController *rootViewController = keyWindow.rootViewController;
+  [rootViewController dismissViewControllerAnimated:YES completion:nil];
+
+  callback(@[[info[UIImagePickerControllerReferenceURL] absoluteString]]);
+}
+
+- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker
+{
+  NSUInteger index = [_pickers indexOfObject:picker];
+  RCTResponseSenderBlock callback = _pickerCancelCallbacks[index];
+
+  [_pickers removeObjectAtIndex:index];
+  [_pickerCallbacks removeObjectAtIndex:index];
+  [_pickerCancelCallbacks removeObjectAtIndex:index];
+
+  UIWindow *keyWindow = [[UIApplication sharedApplication] keyWindow];
+  UIViewController *rootViewController = keyWindow.rootViewController;
+  [rootViewController dismissViewControllerAnimated:YES completion:nil];
+
+  callback(@[]);
+}
+
+@end

Libraries/react-native/react-native.js

@@ -47,6 +47,7 @@ var ReactNative = Object.assign(Object.create(require('React')), {
   AppStateIOS: require('AppStateIOS'),
   AsyncStorage: require('AsyncStorage'),
   CameraRoll: require('CameraRoll'),
+  ImagePickerIOS: require('ImagePickerIOS'),
   InteractionManager: require('InteractionManager'),
   LayoutAnimation: require('LayoutAnimation'),
   LinkingIOS: require('LinkingIOS'),