Cordova plugin callback not being called (iOS)

Question

I'm developing a Cordova plugin for iOS. There's a method in my 'plugin.js' I call only once from my app (javascript) to start listening for callbacks from the native part. When calling this method, I'm storing the callbackId in the Objective-C class, and want to send the callback later on (multiple callbacks possible), so I use the stored callbackId to send the CDVPluginResult, and set 'keepCallback' to true. But callback never arrives in the 'plugin.js', therefor not in the app.

Objective-C Method 1 (that's the listener part):

- (void)listenForNews:(CDVInvokedUrlCommand *)command
{
   self.storedCallbackId = command.callbackId;
   ...

Objective-C Method 2 (that's the method which is being called multiple times asynchronously)

- (void)onNewsReceived
{
   CDVPluginResult* pluginResult = [CDVPluginResult resultWithStatus:CDVCommandStatus_OK];
   [pluginResult setKeepCallbackAsBool:YES];
   [self.commandDelegate sendPluginResult:pluginResult callbackId:self.storedCallbackId];

I've already verified that the 'storedCallbackId' is properly stored and read.

Any ideas?

Answer 1

I do something like the following in my plugin and it works, so give this a try:

- (void)listenForNews:(CDVInvokedUrlCommand *)command
{
   self.storedCallbackId = command.callbackId;
   ...
   CDVPluginResult* pluginResult = [CDVPluginResult resultWithStatus:CDVCommandStatus_NO_RESULT];
   [pluginResult setKeepCallback:[NSNumber numberWithBool:YES]];
   [self.commandDelegate sendPluginResult:pluginResult callbackId:command.callbackId];


- (void)onNewsReceived
{
   CDVPluginResult* pluginResult = [CDVPluginResult resultWithStatus:CDVCommandStatus_OK];
   [pluginResult setKeepCallback:[NSNumber numberWithBool:YES]];
   [self.commandDelegate sendPluginResult:pluginResult callbackId:self.storedCallbackId];