RCTEventEmitter bridge is not set

Is this a bug report?

Not confirm.

Have you read the Contributing Guidelines?

Yes, I have follow all sept of this document of how to use RCTEventEmitter to send event from Native to JS.but still meet this error.

Environment

1. react-native -v: 0.45.1
2. node -v: 8.1.2
3. npm -v: 5.30

Then, specify:

• Target Platform: iOS

• Development Operating System:macOS

• Build tools:iOS 10

Steps to Reproduce

1. Create a helper class that can emit event from iOS native to JS according to the document.
2. invoke sendEventWithName method any where in the code we need to emit event.

Expected Behavior

JS will receive the event and catch the data.

Actual Behavior

[tid:com.facebook.react.ShadowQueue] Exception 'bridge is not set. 
This is probably because you've explicitly synthesized the bridge in RCTCameraEvent, 
even though it's inherited from RCTEventEmitter.'
was thrown while invoking capture on target CameraManager with params (
        {
        audio = 0;
        barCodeTypes =         (
        );
        description = "";
        mirrorImage = 0;
        mode = 1;
        playSoundOnCapture = 1;
        preferredTimeScale = 30;
        quality = 0;
        target = 1;
        title = "";
        totalSeconds = 10;
        type = 1;
    },
    3892,
    3893
)

Reproducible Demo

EventHelper.h

#import <React/RCTBridgeModule.h>
#import <React/RCTEventEmitter.h>

@interface RCTCameraEvent : RCTEventEmitter<RCTBridgeModule>

@end

EventHelper.m

#import "RCTCameraEvent.h"

@implementation RCTCameraEvent

RCT_EXPORT_MODULE();

- (NSArray<NSString *> *)supportedEvents
{
    return @[@"CustomEvent"];
}

- (void)sendEvent2JS
{
    [self sendEventWithName:@"CustomEvent" body:@{@"name": @"111"}];
}

@end

invoke send event method in code

RCTCameraEvent * cameraEvent = [[RCTCameraEvent alloc]init];
[cameraEvent sendEvent2JS];

All I want to do is create a helper class so that I can invoke the send event method anywhere I need.

I have look into many issues (#8714) and search related answer on Google and stackoverflow but still can not found a perfect solution using RCTEventEmitter. there are lots of developers like me meet this problem and react native haven’t provide us a standard code demo or completely document.