[Nav] Add support for bar button icons and left buttons

NavigatorIOS supports four new properties:

  - **rightButtonImageSource:** The source of an image to display in the top right. This must be a static image since UINavigationController only supports UIImages. Adding support for UIImageViews (or arbitrary views) is more complicated because custom views do not fade on touch and do not have hit slop the same way that UIImage buttons do. Usage: `rightButtonImageSource: ix('ImageName')`
  - **backButtonImageSource:** Use a custom image for the back button. This does not replace the back caret (`<`) but instead replaces the text next to it.
  - **leftButtonTitle**: Text for the left nav button, which supersedes the previous nav item's back button when specified. The main use case for this is your initial screen/UIVC which has nothing to go back to (since it is the first VC on the stack) but need to display a left button. This does hide the back button if there would have been one otherwise.
  - **leftButtonImageSource:** Image source for the left button, supersedes the left button title.

Added UIExplorer example to demonstrate.

Examples/UIExplorer/ImageMocks.js

@@ -39,3 +39,8 @@ declare module 'image!uie_thumb_selected' {
   declare var uri: string;
   declare var isStatic: boolean;
 }
+
+declare module 'image!NavBarButtonPlus' {
+  declare var uri: string;
+  declare var isStatic: boolean;
+}

Examples/UIExplorer/NavigatorIOSExample.js

@@ -18,6 +18,7 @@
 var React = require('react-native');
 var ViewExample = require('./ViewExample');
 var {
+  AlertIOS,
   PixelRatio,
   ScrollView,
   StyleSheet,
@@ -91,6 +92,30 @@ var NavigatorIOSExample = React.createClass({
               }
             });
           })}
+          {this._renderRow('Custom Left & Right Icons', () => {
+            this.props.navigator.push({
+              title: NavigatorIOSExample.title,
+              component: EmptyPage,
+              leftButtonTitle: 'Custom Left',
+              onLeftButtonPress: () => this.props.navigator.pop(),
+              rightButtonImageSource: require('image!NavBarButtonPlus'),
+              onRightButtonPress: () => {
+                AlertIOS.alert(
+                  'Bar Button Action',
+                  'Recognized a tap on the bar button icon',
+                  [
+                    {
+                      text: 'OK',
+                      onPress: () => console.log('Tapped OK'),
+                    },
+                  ]
+                );
+              },
+              passProps: {
+                text: 'This page has an icon for the right button in the nav bar',
+              }
+            });
+          })}
           {this._renderRow('Pop', () => {
             this.props.navigator.pop();
           })}

Examples/UIExplorer/UIExplorer/Images.xcassets/NavBarButtonPlus.imageset/Contents.json

@@ -0,0 +1,21 @@
+{
+  "images" : [
+    {
+      "idiom" : "universal",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "universal",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "universal",
+      "scale" : "3x",
+      "filename" : "NavBarButtonPlus@3x.png"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}

Examples/UIExplorer/UIExplorer/Images.xcassets/story-background.imageset/Contents.json

@@ -1,5 +1,9 @@
 {
   "images" : [
+    {
+      "idiom" : "universal",
+      "scale" : "1x"
+    },
     {
       "idiom" : "universal",
       "scale" : "2x",

Libraries/Components/Navigation/NavigatorIOS.ios.js

@@ -12,6 +12,7 @@
 'use strict';
 
 var EventEmitter = require('EventEmitter');
+var Image = require('Image');
 var React = require('React');
 var ReactIOSViewAttributes = require('ReactIOSViewAttributes');
 var RCTNavigatorManager = require('NativeModules').NavigatorManager;
@@ -47,9 +48,14 @@ var RCTNavigatorItem = createReactIOSNativeComponentClass({
     //  NavigatorIOS does not use them all, because some are problematic
     title: true,
     barTintColor: true,
+    leftButtonImageName: true,
+    leftButtonTitle: true,
+    onNavLeftButtonTap: true,
+    rightButtonImageName: true,
     rightButtonTitle: true,
     onNavRightButtonTap: true,
     tintColor: true,
+    backButtonImageName: true,
     backButtonTitle: true,
     titleTextColor: true,
     style: true,
@@ -78,7 +84,12 @@ type Route = {
   title: string;
   passProps: Object;
   backButtonTitle: string;
+  backButtonImageSource: Object;
+  leftButtonTitle: string;
+  leftButtonImageSource: Object;
+  onLeftButtonPress: Function;
   rightButtonTitle: string;
+  rightButtonImageSource: Object;
   onRightButtonPress: Function;
   wrapperStyle: any;
 };
@@ -211,13 +222,40 @@ var NavigatorIOS = React.createClass({
        */
       passProps: PropTypes.object,
 
+      /**
+       * If set, the left header button image will appear with this source. Note
+       * that this doesn't apply for the header of the current view, but the
+       * ones of the views that are pushed afterward.
+       */
+      backButtonImageSource: Image.propTypes.source,
+
       /**
        * If set, the left header button will appear with this name. Note that
        * this doesn't apply for the header of the current view, but the ones
        * of the views that are pushed afterward.
        */
       backButtonTitle: PropTypes.string,
 
+      /**
+       * If set, the left header button image will appear with this source
+       */
+      leftButtonImageSource: Image.propTypes.source,
+
+      /**
+       * If set, the left header button will appear with this name
+       */
+      leftButtonTitle: PropTypes.string,
+
+      /**
+       * Called when the left header button is pressed
+       */
+      onLeftButtonPress: PropTypes.func,
+
+      /**
+       * If set, the right header button image will appear with this source
+       */
+      rightButtonImageSource: Image.propTypes.source,
+
       /**
        * If set, the right header button will appear with this name
        */
@@ -544,7 +582,12 @@ var NavigatorIOS = React.createClass({
             this.props.itemWrapperStyle,
             route.wrapperStyle
           ]}
+          backButtonImageName={this._imageNameFromSource(route.backButtonImageSource)}
           backButtonTitle={route.backButtonTitle}
+          leftButtonImageName={this._imageNameFromSource(route.leftButtonImageSource)}
+          leftButtonTitle={route.leftButtonTitle}
+          onNavLeftButtonTap={route.onLeftButtonPress}
+          rightButtonImageName={this._imageNameFromSource(route.rightButtonImageSource)}
           rightButtonTitle={route.rightButtonTitle}
           onNavRightButtonTap={route.onRightButtonPress}
           tintColor={this.props.tintColor}>
@@ -558,6 +601,10 @@ var NavigatorIOS = React.createClass({
     );
   },
 
+  _imageNameFromSource: function(source: ?Object) {
+    return source ? source.uri : undefined;
+  },
+
   renderNavigationStackItems: function() {
     var shouldRecurseToNavigator =
       this.state.makingNavigatorRequest ||

React/Modules/RCTUIManager.m

@@ -1140,6 +1140,12 @@ - (NSDictionary *)customBubblingEventTypes
         @"captured": @"onNavigationCompleteCapture"
       }
     },
+    @"topNavLeftButtonTap": @{
+      @"phasedRegistrationNames": @{
+        @"bubbled": @"onNavLeftButtonTap",
+        @"captured": @"onNavLefttButtonTapCapture"
+      }
+    },
     @"topNavRightButtonTap": @{
       @"phasedRegistrationNames": @{
         @"bubbled": @"onNavRightButtonTap",

React/Views/RCTNavItem.h

@@ -12,7 +12,11 @@
 @interface RCTNavItem : UIView
 
 @property (nonatomic, copy) NSString *title;
+@property (nonatomic, copy) UIImage *leftButtonImage;
+@property (nonatomic, copy) NSString *leftButtonTitle;
+@property (nonatomic, copy) UIImage *rightButtonImage;
 @property (nonatomic, copy) NSString *rightButtonTitle;
+@property (nonatomic, copy) UIImage *backButtonImage;
 @property (nonatomic, copy) NSString *backButtonTitle;
 @property (nonatomic, copy) UIColor *tintColor;
 @property (nonatomic, copy) UIColor *barTintColor;

React/Views/RCTNavItemManager.m

@@ -20,10 +20,23 @@ - (UIView *)view
 }
 
 RCT_EXPORT_VIEW_PROPERTY(title, NSString)
+RCT_EXPORT_VIEW_PROPERTY(leftButtonTitle, NSString);
 RCT_EXPORT_VIEW_PROPERTY(rightButtonTitle, NSString);
 RCT_EXPORT_VIEW_PROPERTY(backButtonTitle, NSString);
 RCT_EXPORT_VIEW_PROPERTY(tintColor, UIColor);
 RCT_EXPORT_VIEW_PROPERTY(barTintColor, UIColor);
 RCT_EXPORT_VIEW_PROPERTY(titleTextColor, UIColor);
+RCT_CUSTOM_VIEW_PROPERTY(leftButtonImageName, UIImage, RCTNavItem)
+{
+  view.leftButtonImage = json ? [RCTConvert UIImage:json] : defaultView.leftButtonImage;
+}
+RCT_CUSTOM_VIEW_PROPERTY(rightButtonImageName, UIImage, RCTNavItem)
+{
+  view.rightButtonImage = json ? [RCTConvert UIImage:json] : defaultView.rightButtonImage;
+}
+RCT_CUSTOM_VIEW_PROPERTY(backButtonImageName, UIImage, RCTNavItem)
+{
+  view.backButtonImage = json ? [RCTConvert UIImage:json] : defaultView.backButtonImage;
+}
 
 @end

React/Views/RCTWrapperViewController.m

@@ -86,17 +86,43 @@ - (void)viewWillAppear:(BOOL)animated
       [bar setTitleTextAttributes:@{NSForegroundColorAttributeName : _navItem.titleTextColor}];
     }
 
-    if (_navItem.rightButtonTitle.length > 0) {
+    if (_navItem.leftButtonImage) {
+      self.navigationItem.leftBarButtonItem =
+        [[UIBarButtonItem alloc] initWithImage:_navItem.leftButtonImage
+                                         style:UIBarButtonItemStylePlain
+                                        target:self
+                                        action:@selector(handleNavLeftButtonTapped)];
+    } else if (_navItem.leftButtonTitle.length > 0) {
+      self.navigationItem.leftBarButtonItem =
+        [[UIBarButtonItem alloc] initWithTitle:_navItem.leftButtonTitle
+                                         style:UIBarButtonItemStylePlain
+                                        target:self
+                                        action:@selector(handleNavLeftButtonTapped)];
+    }
+
+    if (_navItem.rightButtonImage) {
       self.navigationItem.rightBarButtonItem =
-      [[UIBarButtonItem alloc] initWithTitle:_navItem.rightButtonTitle
-                                       style:UIBarButtonItemStyleDone
-                                      target:self
-                                      action:@selector(handleNavRightButtonTapped)];
+        [[UIBarButtonItem alloc] initWithImage:_navItem.rightButtonImage
+                                         style:UIBarButtonItemStylePlain
+                                        target:self
+                                        action:@selector(handleNavRightButtonTapped)];
+    } else if (_navItem.rightButtonTitle.length > 0) {
+      self.navigationItem.rightBarButtonItem =
+        [[UIBarButtonItem alloc] initWithTitle:_navItem.rightButtonTitle
+                                         style:UIBarButtonItemStyleDone
+                                        target:self
+                                        action:@selector(handleNavRightButtonTapped)];
     }
 
-    if (_navItem.backButtonTitle.length > 0) {
+    if (_navItem.backButtonImage) {
+      self.navigationItem.backBarButtonItem =
+        [[UIBarButtonItem alloc] initWithImage:_navItem.backButtonImage
+                                         style:UIBarButtonItemStylePlain
+                                        target:nil
+                                        action:nil];
+    } else if (_navItem.backButtonTitle.length > 0) {
       self.navigationItem.backBarButtonItem =
-      [[UIBarButtonItem alloc] initWithTitle:_navItem.backButtonTitle
+        [[UIBarButtonItem alloc] initWithTitle:_navItem.backButtonTitle
                                        style:UIBarButtonItemStylePlain
                                       target:nil
                                       action:nil];
@@ -114,6 +140,12 @@ - (void)loadView
   self.view = _wrapperView;
 }
 
+- (void)handleNavLeftButtonTapped
+{
+  [_eventDispatcher sendInputEventWithName:@"topNavLeftButtonTap"
+                                      body:@{@"target":_navItem.reactTag}];
+}
+
 - (void)handleNavRightButtonTapped
 {
   [_eventDispatcher sendInputEventWithName:@"topNavRightButtonTap"