Add Native Modules (iOS) guide

[frantic]

cc @vjeux @nicklockwood @a2

[sophiebits]

(Do we want to kill the RCT prefix from this module?)

[sahrens]

Yeah, we probably should.

-Spencer

On Mar 21, 2015, at 11:48 AM, Ben Alpert notifications@github.com wrote:

In docs/NativeModulesIOS.md:

+The native module can signal events to JavaScript without being invoked directly. The easiest way to do this is to use eventDispatcher:
+
+```objective-c
+- (void)calendarEventReminderReceived:(NSNotification *)notification
+{

• NSString *eventName = notification.userInfo[@"name"];
• [self.bridge.eventDispatcher sendAppEventWithName:@"EventReminder"

•                                           body:@{@"name": eventName}];
  

  +}
  + + +JavaScript code can subscribe to these events: + +javascript
  +var subscription = RCTDeviceEventEmitter.addListener(
  (Do we want to kill the RCT prefix from this module?)

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[sahrens]

This is awesome - really thorough!

[nicklockwood]

RCT prefix should only be used for first-party modules, we shouldn't encourage others to use it as it will create namespace conflicts.