Add <Modal /> component

Summary:
Create Modal component that can be used to present content modally.

Examples/UIExplorer/ModalExample.js

@@ -0,0 +1,99 @@
+/**
+ * The examples provided by Facebook are for non-commercial testing and
+ * evaluation purposes only.
+ *
+ * Facebook reserves all rights not expressly granted.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON INFRINGEMENT. IN NO EVENT SHALL
+ * FACEBOOK BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * @flow
+ */
+'use strict';
+
+var React = require('react-native');
+var {
+  Modal,
+  StyleSheet,
+  Text,
+  TouchableHighlight,
+  View,
+} = React;
+
+exports.displayName = (undefined: ?string);
+exports.framework = 'React';
+exports.title = '<Modal>';
+exports.description = 'Component for presenting modal views.';
+
+var ModalExample = React.createClass({
+  getInitialState: function() {
+    return {
+      openModal: null,
+    };
+  },
+
+  _closeModal: function() {
+    this.setState({openModal: null});
+  },
+
+  _openAnimatedModal: function() {
+    this.setState({openModal: 'animated'});
+  },
+
+  _openNotAnimatedModal: function() {
+    this.setState({openModal: 'not-animated'});
+  },
+
+  render: function() {
+    return (
+      <View>
+        <Modal animated={true} visible={this.state.openModal === 'animated'}>
+          <View style={styles.container}>
+            <Text>This modal was presented with animation.</Text>
+            <TouchableHighlight underlayColor="#a9d9d4" onPress={this._closeModal}>
+              <Text>Close</Text>
+            </TouchableHighlight>
+          </View>
+        </Modal>
+
+        <Modal visible={this.state.openModal === 'not-animated'}>
+          <View style={styles.container}>
+            <Text>This modal was presented immediately, without animation.</Text>
+            <TouchableHighlight underlayColor="#a9d9d4" onPress={this._closeModal}>
+              <Text>Close</Text>
+            </TouchableHighlight>
+          </View>
+        </Modal>
+
+        <TouchableHighlight underlayColor="#a9d9d4" onPress={this._openAnimatedModal}>
+          <Text>Present Animated</Text>
+        </TouchableHighlight>
+
+        <TouchableHighlight underlayColor="#a9d9d4" onPress={this._openNotAnimatedModal}>
+          <Text>Present Without Animation</Text>
+        </TouchableHighlight>
+      </View>
+    );
+  },
+});
+
+exports.examples = [
+  {
+    title: 'Modal Presentation',
+    description: 'Modals can be presented with or without animation',
+    render: () => <ModalExample />,
+  },
+];
+
+var styles = StyleSheet.create({
+  container: {
+    alignItems: 'center',
+    backgroundColor: '#f5fcff',
+    flex: 1,
+    justifyContent: 'center',
+  },
+});

Examples/UIExplorer/UIExplorerList.ios.js

@@ -37,6 +37,7 @@ var COMPONENTS = [
   require('./ListViewGridLayoutExample'),
   require('./ListViewPagingExample'),
   require('./MapViewExample'),
+  require('./ModalExample'),
   require('./Navigator/NavigatorExample'),
   require('./NavigatorIOSColorsExample'),
   require('./NavigatorIOSExample'),